RM18.00

A relay is an electrically operated device. It has a control system and (also called input circuit or input contactor) and controlled system (also called output circuit or output contactor). It is frequently used in an automatic control circuit. To put it simply, it is an automatic switch to controlling a high-current circuit with a low-current signal. The advantages of a relay lie in its lower inertia of the moving, stability, long-term reliability and small volume. It is widely adopted in devices of power protection, automation technology, sport, remote control, reconnaissance, and communication, as well as in devices of electromechanics and power electronics. Generally speaking, a relay contains an induction part which can reflect input variable like current, voltage, power, resistance, frequency, temperature, pressure, speed and light etc. It also contains an actuator module (output) which can energize or de-energize the connection of controlled circuit. There is an intermediary part between input part and an output part that is used to coupling and isolate input current, as well as actuate the output. When the rated value of the input (voltage, current and temperature etc.) is above the critical value, the controlled output circuit of the relay will be energized or de-energized.   Features: SMD optocoupler isolation Good in safety. In power system and high voltage system, the lower current can control the higher one, able to control various appliances and other equipment with high-current current. Standard interface that can be controlled directly by microcontroller (Arduino, 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic). Indication LEDs for Relay output status. With a normally-open (NO) and a normally-close (NC) contact.   Specification: Number of Relays: 4 Control signal: TTL level (Active Low) Rated load: 7A/250VAC; 10A/125VAC; 10A/28VDC; Contact action time: 10ms/5ms Current: 15-20mA per channel       Pin definition COM - Common pin: This is source pin, that starts connected to NC, and connects to NO when you apply 0v / GND (active low) NC (Normally Closed): in which case NC is connected with COM when INT1 is set low and disconnected when INT1 is high; NO (Normally Open): in which case NO is disconnected with COM1 when INT1 is set low and connected when INT1 is high. INT 1- Relay 1 control port: changes from the COM–>NO to the COM–>NC when you apply 0v / GND (active low) INT 2- Relay 2 control port: changes from the COM à NO to the COM à NC when you apply 0v / GND (active low)   Relay Module tutorial Above: Example of connecting power and lights to a relays COM and NO connectors.     The Sketch Enter the following sketch, upload it and go to town. If you open your Arduino serial monitor you will be able to see the progress. // Basic 4 Realy board connection // Each relay is turned on for 2 seconds and then off. // You can here them click as there state changes from off to on and on to off. // You will also see the corresponding Red LED on the 4 Relay board light up when the relay is on. // Define names for the 4 Digital pins On the Arduino 7,8,9,10 // These data pins link to 4 Relay board pins IN1, IN2, IN3, IN4 #define RELAY1  6                         #define RELAY2  7                         #define RELAY3  8                         #define RELAY4  9 void setup(){     // Initialise the Arduino data pins for OUTPUT   pinMode(RELAY1, OUTPUT);          pinMode(RELAY2, OUTPUT);   pinMode(RELAY3, OUTPUT);   pinMode(RELAY4, OUTPUT); } void loop(){    digitalWrite(RELAY1,LOW);           // Turns ON Relays 1    delay(2000);                                      // Wait 2 seconds    digitalWrite(RELAY1,HIGH);          // Turns Relay Off    digitalWrite(RELAY2,LOW);           // Turns ON Relays 2    delay(2000);                                      // Wait 2 seconds    digitalWrite(RELAY2,HIGH);          // Turns Relay Off    digitalWrite(RELAY3,LOW);           // Turns ON Relays 3    delay(2000);                                      // Wait 2 seconds    digitalWrite(RELAY3,HIGH);          // Turns Relay Off    digitalWrite(RELAY4,LOW);           // Turns ON Relays 4    delay(2000);                                      // Wait 2 seconds    digitalWrite(RELAY4,HIGH);          // Turns Relay Off         } Video: Relay Video Explanation: http://www.youtube.com/watch?v=YJNUe65BVM0 Using Relays and Relay Boards with the Raspberry Pi - http://www.youtube.com/watch?v=b6ZagKRnRdM

RM410.00

Raspberry Pi 4 Model B is the latest product in the popular Raspberry Pi range of computers. It offers ground-breaking increases in processor speed, multimedia performance, memory, and connectivity compared to the prior-generation Raspberry Pi 3 Model B+, while retaining backwards compatibility and similar power consumption. For the end user, Raspberry Pi 4 Model B provides desktop performance comparable to entry-level x86 PC systems. This product’s key features include a high-performance 64-bit quad-core processor, dual-display support at resolutions up to 4K via a pair of micro-HDMI ports, hardware video decode at up to 4Kp60, up to 4GB of RAM, dual-band 2.4/5.0 GHz wireless LAN, Bluetooth 5.0, Gigabit Ethernet, USB 3.0, and PoE capability (via a separate PoE HAT add-on). The dual-band wireless LAN and Bluetooth have modular compliance certifcation, allowing the board to be designed into end products with signifcantly reduced compliance testing, improving both cost and time to market.   So what's new? New Raspbain Software (Debian 10 Buster) Encapsulated processor Cortex A-72 USB 3.0 type C Ethernet Broadcom BCM54213PE on a separate bus to the USB traffic Bluetooth 5.5 and Bluetooth LE LPDDR4 SDRAM Since the new pi changes the full HDMI interface into two micro HDMI ports, so you may need this Micro HDMI to HDMI Adapter to work with your HDMI display.   Features Broadcom BCM2711, Quad core Cortex-A72 (ARM v8) 64-bit SoC @ 1.5GHz 4GB LPDDR4-2400 SDRAM  (1GB Version) 2.4 GHz and 5.0 GHz IEEE 802.11ac wireless, Bluetooth 5.0, BLE Gigabit Ethernet 2 USB 3.0 ports; 2 USB 2.0 ports. Raspberry Pi standard 40 pin GPIO header (fully backwards compatible with previous boards) 2 × micro-HDMI ports (up to 4kp60 supported) 2-lane MIPI DSI display port 2-lane MIPI CSI camera port 4-pole stereo audio and composite video port H.265 (4kp60 decode), H264 (1080p60 decode, 1080p30 encode) OpenGL ES 3.0 graphics Micro-SD card slot for loading operating system and data storage 5V DC via USB-C connector (minimum 3A*) 5V DC via GPIO header (minimum 3A*) Power over Ethernet (PoE) enabled (requires separate PoE HAT) Operating temperature: 0 – 50 degrees C ambient Supports Raspbian, Windows 10 IoT Core, OpenELEC, OSMC, Pidora, Arch Linux, RISC OS and More!     Software installation Beginners should start with the NOOBS (New Out Of Box Software) operating system installation manager, which gives the user a choice of operating system from the standard distributions. SD cards with NOOBS pre-installed should be available from any of our global distributors and resellers. Alternatively, you can download NOOBS. Raspbian is the recommended operating system for normal use on a Raspberry Pi. You can browse basic examples to help you get started with some of the software available in Raspbian, find more detail about the Raspbian operating system, or read information on fundamental Linux usage and commands for navigating the Raspberry Pi and managing its file system and users.   Comparison with Pi 3+ Spec Raspberry Pi 4 B Raspberry Pi 3 B+ CPU 1.5-GHz, Quad-Core Broadcom BCM2711B0 (Cortex A-72) 1.4-GHz, Quad Core Broadcom BCM2837B0  (Cortex A-53) RAM 1 - 4GB DDR4 1GB DDR2 GPU 500 MHz VideoCore VI  400 MHz VideoCore IV Video Out dual micro HDMI ports single HDMI port Max resolution 4K 60 Hz + 1080p or 2x 4K 30 Hz 2560 x 1600 USB Ports 2x USB 3.0 / 2x USB 2.0 4x USB 2.0 Wired Networking Gigabit Ethernet 330 Mbps Ethernet Wireless 802.11ac (2.4 / 5 GHz), Bluetooth 5.0 802.11ac (2.4 / 5 GHz), Bluetooth 4.1 Charging Port USB Type-C micro USB Power Requirement 3A, 5V 2.5A, 5V Size 3.5 x 2.3 x 0.76 inches (88 x 58 x 19.5mm) 3.2 x 2.2 x 0.76 inches (82 x 56 x 19.5mm) reviews/raspberry-pi-4-b,6193.html  

RM50.00

  How to Connect a signal receiver (such as for Arduino) to the RS485 terminal. Input power to the power terminals. According to the obtained data, the data is processed differently according to the actual needs.   Applications Factory inspection, equipment box inspection, environmental testing, home safety Features Support MODBUS RTU protocol RS485 supports 1000 meters communication Standard DIN35 mounting rails High precision Industrial products, high progress SHT20 temperature and humidity sensor, the RS485 communication Standard MODBUS protocol and ordinary protocol, the user can choose communication protocol Baud rate can decide for themselves General agreement with automatic upload function, upload speed can decide for themselves   Specifications Working Voltage: DC 5V ~ 30V Output Signal: RS485 Signal Communication Protocol: Modbus RTU and Common Protocol Communication Address: 1 ~ 247 (Default 1) Temperature Range: -40degree Celsius ~ 60degree Celsius Temperature Accuracy: +/- 0.5degree Celsius Temperature Resolution: 0.1degree Celsius Humidity Range: 0% RH ~ 80% RH Humidity Accuracy: +/- 3% Rh Humidity Resolution: 0.1% RH Power: <0.2W Working Temperature: -40degree Celsius ~ 85degree Celsius Working Humidity: 0% ~ 95% RH Size: 65 * 46 * 28.5mm(Approx.)   Package 1pcs XY-MD02                  

RM85.00

multifunction delay relay module.LCD display, very clear, easy to use, powerful.It can be widely used at Smart home,Industrial control,Automatic irrigation,Indoor ventilation.Protection equipment.   Applications Motor Robot Smart home Industrial control Automatic irrigation Indoor ventilation Features Control accuracy is for temperature 0.1 °C and for humidity is too 0.1 step – it is a great advantage ! Measurement accuracy is at a high level, measuring both temperature and humidity Two independent relays, LED signalization of Work status is fine Calibration in 0.1 steps, it is good to own, the instrument is coming very accurately The LED display has nice backlit Very good price for 12-13usd you get two controllers in one package   Specifications   Package 1pcs XY-WJ01     Load can be max 10A . LOAD means a heater or a cooling compressor for TM relays. The humidifier or dehumidifier is for HM relay output The relay output is not it is not “electrically” connected to the XY-WTH1 electronics so we can also control the 110V or 220V voltage.              How to set the temperature for heating or cooling: The automatic identification of work mode: The system automatically according to the start/stop temperature, identify work mode Start temperature > stop temperature, cooling mode ‘C’ Start temperature < stop temperature, heating mode ‘H’   How to set the start/stop temperature: 1. In the running interface, Long Press TEMP+ key more than 3 seconds, into the start temperature settings interface, can be modified by TEMP+ TEMP- key, to be modified, waiting for 6s automatic exit and save     2. In the running interface, Long Press TEMP- key more than 3 seconds, into the stop temperature settings interface, can be modified by TEMP+ TEMP- key, to be modified after the parameters, waiting for 6s automatic exit and save Cooling mode: When the temperature ≥ Start temperature, relay conduction, red led on, refrigeration equipment begin to work. When the temperature ≤ Stop temperature, relay disconnect, red led off, refrigeration equipment stop to work. Heating mode: When the temperature ≤ Start temperature, relay conduction, red led on, heating equipment begin to work. When the temperature ≥ Stop temperature, relay disconnect, red led off, heating equipment stop to work. OFE   -Temperature correction function calibration (-10.0 ~ 10℃):"                  The system is working for a long time and may be biased, through this function correction, the actual temperature = measuring temperature + calibration value; How to set humidity control humidification or dehumidification: The automatic identification of work mode: The system automatically according to the start/stop humidity, identify work mode Start humidity> stop humidity, dehumidification mode ‘D’ Start humidity< stop humidity, humidification mode ‘E’   How to set the start/stop humidity: 1. In the running interface, Long Press ‘ HUMI+ ‘ key more than 3 seconds, into the start humidity settings interface, can be modified by HUMI+ HUMI– key, to be modified, waiting for 6s automatic exit and save. 2. In the running interface, Long Press ‘ HUMI-‘ key more than 3 seconds, into the stop humidity settings interface, can be modified by HUMI+ HUMI- key, to be modified after the parameters, waiting for 6s automatic exit and save. Dehumidification mode: When the humidity≥ Start humidity, relay conduction, green led on, dehumidification equipment begin to work. When the humidity≤ Stop humidity, relay disconnect, green led off, dehumidification equipment stop to work. Humidification mode: When the humidity≤ Start humidity, relay conduction, green led on, humidification equipment begin to work. When the humidity≥ Stop humidity, relay disconnect, green led off, humidification equipment stop to work. RH-Humidification correction function calibration   (-10.0 ~ 10%): The system is working for a long time and may be biased, through this function correction, the actual humidity = measuring humidity + calibration value.   TTL programiming from UART: Serial control(TTL level) Baud Rate:9600bps Data bits :8 stop bits :1 crc :none Flow control :none  CMD Description start start data upload stop stop data upload read Read the param setting T:ON Temperature relay enable T:OFF Temperature relay disable H:ON Humidity relay enable H:OFF Humidity relay disable TS:XX.X Set start Temperature (-20.0~60.0) TP:XX.X Set stop Temperature (-20.0~60.0) HS:XX.X Set start Humidity (00.0~100.0) HP:XX.X Set stop Humidity (00.0~100.0) TC:XX.X Set Temperature Calibration (-10.0~10.0) HC:XX.X Set Humidity Calibration (-10.0~10.0)  

RM60.00

The ESP32-CAM can be widely used in intelligent IoT applications such as wireless video monitoring, WiFi image upload, QR identification, and so on. Applications Smart home devices image upload Wireless monitoring Intelligent agriculture QR wireless identification facial recognition   Features Onboard ESP32-S module, supports WiFi + Bluetooth OV2640 camera with flash Onboard TF card slot, supports up to 4G TF card for data storage Supports WiFi video monitoring and WiFi image upload Supports multi sleep modes, deep sleep current as low as 6mA Control interface is accessible via pinheader, easy to be integrated and embedded into user products   Specifications WIFI module: ESP-32S Processor: ESP32-D0WD Built-in Flash: 32Mbit RAM: Internal 512KB + External 4M PSRAM Antenna: Onboard PCB antenna WiFi protocol: IEEE 802.11 b/g/n/e/i Bluetooth: Bluetooth 4.2 BR/EDR and BLE WIFI mode: Station / SoftAP / SoftAP+Station Security: WPA/WPA2/WPA2-Enterprise/WPS Output image format: JPEG (OV2640 support only), BMP, GRAYSCALE Supported TF card: up to 4G Peripheral interface: UART/SPI/I2C/PWM IO port: 9 UART baudrate rate: default 115200bps Power supply: 5V Transmitting power: 802.11b: 17 ±2dBm((at)11Mbps) 802.11g: 14 ±2dBm((at)54Mbps) 802.11n: 13 ±2dBm((at)HT20,MCS7) Receiving sensitivity: CCK,1Mbps: -90 dBm CCK,11Mbps: -85 dBm 6Mbps(1/2 BPSK): -88 dBm 54Mbps(3/4 64-QAM): -70 dBm HT20,MCS7(65Mbps, 72.2Mbps): -67 dBm Power consumption: Flash off: 180mA(at)5V Flash on and brightness max: 310mA(at)5V Deep-Sleep: as low as 6mA(at)5V Modern-Sleep: as low as 20mA(at)5V Light-Sleep: as low as 6.7mA(at)5V Operating temperature: -20 ℃ ~ 85 ℃ Storage environment: -40 ℃ ~ 90 ℃, <90%RH Dimensions: 40.5mm x 27mm x 4.5mm   Development Resources Wiki : www.waveshare.com/wiki/ESP32-CAM   Package Contains ESP32-CAM x1 OV2640 camera x1        

RM65.00

    Operating Voltage : 4.8 ~ 6.6V Type: 360° Operating Speed : 0.19sec (4.8V) Operating Speed : 0.17sec (6.6V) Stall Torque : 17.2 kg-cm at 4.8V Stall Torque : 20.5 kg-cm at 6.6V Maximum PW: 1520μs / 333hz Temperature Range : 0 ~ +55℃ Servo Type : Digital Servo Gear Type: Copper& Aluminum Waterproof: Yes   The wire colors are: Red = Battery(+)  Brown = Battery(-)  Orange = Signal  

RM16.00

This bracket is suitable to be used in joints of various robotics project. Suitable Servo: RDS3115   Package include 1 x Servo Motor Bracket    

RM20.00

  This module interfaces USB to RS-485.  It has Auto Direction control, making it easier to use as RS-232/TTL Serial Interface replacement. RS485 is used for Serial Communications over longer distances than direct RS232 or TTL, and supports multiple units on the same bus (Multi-Drop)   Features Support Windows98 / ME / 2000 / XP / WIN7 / Vista / Linux / Mac Support devices with RS485 interface: surveillance cameras, video capture device, fingerprint attendance machine, PBX, CNC machine, microcontroller, etc. This converter provides two way serial communications signal Conversion between the RS485 To and from a personal computer USB port Using virtual serial COM port Self-powered from USB w/ FT232RL + 75176 chips   Descriptions Standard: USB2.0 standard, backward compatible, in line with the standard RS485 Direction control: the use of automatic data flow control, auto distinguish and control data transfer direction Baud: 300-9216000bps, automatically detecting the serial signal data rate Load capacity: support multipoint, each converter allows RS485 interface device to connect 32 Interface Protection: TVS tube protection, USB self-recovery protection Size: Approx. 76 x 18.5 x 16mm   Package included 1 x Serial Converter Module   This converter provides two way serial communications signal conversion between the RS485 to and from a personal computer USB port using virtual serial COM port. Can have up to 32 devices on the bus. The 4 jumpers connect the USB interface to the RS485 interface. If the jumpers are removed, the USB interface may be used as a TTL Level Serial port.   The drivers for Windows can be loaded by this program from FTDI: http://www.ftdichip.com/Drivers/CDM/CDM20830_Setup.exe   Plugging the USB interface in then should show a Virtual Serial Port in Device Manager.   Self-powered from USB  Uses  FT232RL+75176 chips Can be used to connect PC to one or more Arduino or other Microcomputers with RS-485 modules.  

RM60.00

The Arduino Mega 2560 is a microcontroller board based on the ATmega2560. It has 54 Digital Input/Output Pins of which 15 can be used as PWM Outputs, 16 Analog Inputs, 4 UARTs Hardware Serial Ports, a 16 MHz Crystal Oscillator, a USB connection, a power jack, an ICSP header, and a reset button. It contains everything needed to support the microcontroller; simply connect it to a computer with a USB cable or power it with a AC-to-DC adapter or battery to get started.   Features Pinout: added SDA and SCL pins that are near to the AREF pin and two other new pins placed near to the RESET pin, the IOREF that allow the shields to adapt to the voltage provided from the board. In future, shields will be compatible both with the board that use the AVR, which operate with 5V and with the Arduino Due that operate with 3.3V. The second one is a not connected pin, that is reserved for future purposes. Stronger RESET circuit. Atmega 16U2 replace the 8U2.   Specifications Microcontroller: ATmega2560 Input Voltage (recommended): 7 – 12V Input Voltage (limits): 6 – 20V Digital I/O Pins: 54 (of which 15 provide PWM output) Analog Input Pins: 16 DC Current per I/O Pin: 40 mA DC Current for 3.3V Pin: 50 mA Flash Memory: 256 KB of which 8 KB used by bootloader SRAM: 8 KB EEPROM: 4 KB Clock Speed: 16 MHz Product size: 10.3 * 5.4 * 1.2cm / 4.1 * 2.1 * 0.5in Product weight: 35g / 1.2oz Package dimensions: 12.5 * 14.5 * 1.5cm / 5.0 * 5.7 * 0.6in Package weight: 66g / 2.2oz Package List: 1 * Mega2560 R3 Version 1 * USB Cable     Frequently Asked Questions:    Are these 100% compatible with the "normal" Arduino's?  Yes, they really are 100% completely compatible with "normal" Arduino's. Build quality looks the same and everything (studio, library, tools, etc) just works. You may read the reviews.​   What if I'm still concerned about this being named as "Arduino Compatible"?  If still in doubt, please buy from Arduino's official dealer channels. Yes they are more expensive. We use these internally ourselves for various electronic projects and find them to be 100% decent (again, check reviews). That said, we do not make these and we are providing all the information we know. 

RM70.00

The TTGO T-display ESP32 is basically an ESP32 development board with some added hardware features. To be able to program the board you need to add the board to and with the Boards Manager of the Arduino IDE.   Features On-board IPS display Rapid Prototyping – Get right into application design and development without worrying about RF performance and antenna design. The ESP32 has your basic system requirements already covered. Just plug in the USB cable and you’re good to go! Flexible and Feature-Rich – The ESP32 contains the entire basic support circuitry for the ESP-WROOM-32, including the USB-UART bridge, reset- and boot-mode buttons, LDO regulator and a type-C-USB connector. Every important GPIO is available to the developer. Breadboard-Friendly – The ESP32 pinout is optimized for prototyping on a breadboard. The on-board LDO output is led out for powering additional off-board electronics. Peripheral outputs are grouped together for hassle-free prototyping. Arduino-like hardware I/O – Advanced API for hardware IO, which can dramatically reduce the redundant work for configuring and manipulating hardware. Code like arduino, but interactively in Lua script. Type-C USB   Hardware Specifications Chipset ESPRESSIF-ESP32 240MHz Xtensa® dual-core 32-bit LX6 microprocessor FLASH QSPI flash 4MB SRAM 520 kB SRAM Button Reset USB to TTL CP2104 Interface UART, SPI, SDIO, I2C, LED PWM, TV PWM, I2S, IRGPIO,ADC, capacitor touch sensor, DACLNA pre-amplifier Display IPS ST7789V 1.14 Inch Working voltage 2.7V-4.2V Working current About 60MA Sleep current About 120uA Working temperature range -40C~+85°C Size & Weight 51.52 x 25.04 x 8.54mm(7.81g)   Power Supply Power Supply USB 5V/1A Charging current 500mA Battery 3.7V lithium battery JST Connector 2Pin 1.25mm USB Type-C   WiFi Standard FCC/CE-RED/IC/TELEC/KCC/SRRC/NCC Protocol 802.11 b/g/n (802.11n, speed up to 150Mbps) A-MPDU and A-MSDU polymerization, support 0.4us Protection interval Frequency range 2.4GH2~2.5GHz(2400M-2483.5M) Transmit Power 22dBm Communication distance 300m   Bluetooth Protocol Support bluetooth V4.2BR/EDR and BLE standard Radio frequency With -97dBm sensitivity NZIF receiver Class-1, Cl ass-2 & Class-3 emitter AFH Audio frequency CVSD&SBC audio frequency   Software Wi-Fi Mode Station/SoftAP/SoftAP+Station/P2P Security mechanism WPA/WPA2/WPA2-Enterprise/WPS Encryption Type AES/RSA/ECC/SHA Firmware upgrade UART download/OTA (Through network/host to download and write firmware) Software Development Support cloud server development/SDK for user firmware development Networking protocol IPv4, IPv6, SSL, TCP/UDP/HTTP/FTP/MQTT User Configuration AT + Instruction set, cloud server, android/iOSapp OS FreeRTOS   Package Includes 1 x TTGO T-Display ESP32 Board   Support https://github.com/Xinyuan-LilyGO/TTGO-T-Display https://github.com/espressif/arduino-esp32/blob/master/docs/arduino-ide/boards_manager.md https://sites.google.com/site/jmaathuis/arduino/lilygo-ttgo-t-display-esp32    

RM4.00

  A relay is an electrically operated device. It has a control system and (also called input circuit or input contactor) and controlled system (also called output circuit or output contactor). It is frequently used in an automatic control circuit. To put it simply, it is an automatic switch to controlling a high-current circuit with a low-current signal. The advantages of a relay lie in its lower inertia of the moving, stability, long-term reliability and small volume. It is widely adopted in devices of power protection, automation technology, sport, remote control, reconnaissance, and communication, as well as in devices of electromechanics and power electronics. Generally speaking, a relay contains an induction part which can reflect input variable like current, voltage, power, resistance, frequency, temperature, pressure, speed and light etc. It also contains an actuator module (output) which can energize or de-energize the connection of controlled circuit. There is an intermediary part between input part and an output part that is used to coupling and isolate input current, as well as actuate the output. When the rated value of the input (voltage, current and temperature etc.) is above the critical value, the controlled output circuit of the relay will be energized or de-energized.   Features: SMD optocoupler isolation Good in safety. In power system and high voltage system, the lower current can control the higher one, able to control various appliances and other equipment with high-current current. Standard interface that can be controlled directly by microcontroller (Arduino, 8051, AVR, PIC, DSP, ARM, ARM, MSP430, TTL logic). Indication LEDs for Relay output status. With a normally-open (NO) and a normally-close (NC) contact.   Specification: Number of Relays: 1 Working voltage: 5V DC Control signal: TTL level Rated load: 7A/250VAC; 10A/125VAC; 10A/28VDC; Contact action time: 10ms/5ms Current: 15-20mA per channel   Relay Module tutorial The Connections The Sketch Enter the following sketch, upload it and go to town. If you open your Arduino serial monitor you will be able to see the voltage. void setup(){ pinMode(7,OUTPUT); } void loop() { digitalWrite(7, HIGH); delay(2000); digitalWrite(7,LOW); delay(2000); }

RM170.00

This PH sensor Module consists of PH sensor also called as PH probe and a Signal Conditioning Board which gives an output which is proportional to the PH Value and can be interfaced directly to any Micro-controller. The pH sensor components are usually combined into one device called a combination pH electrode. The measuring electrode is usually glass and quite fragile. Recent developments have replaced the glass with more durable solid-state sensors. The preamplifier is a signal-conditioning device. It takes the high-impedance pH electrode signal and changes it into a low impedance signal which the analyzer or transmitter can accept. The preamplifier also strengthens and stabilizes the signal, making it less susceptible to electrical noise. pH and ORP probes are both used for measuring the acidic intensity of liquid solutions. A pH probe measures acidity on a scale from 0 to 14, with 0 being the most acidic and 14 being the most basic. Similarly, an Oxidation-Reduction Potential (ORP) probe returns a voltage proportional to the tendency of the solution to gain or lose electrons from other substances (which is linked directly to the pH a substance).   Applications Can be used as different tester, pH meter or controller Suitable for most aquariums, hydroponics, laboratory etc   Specifications Working Voltage: 5V DC Working Current: 5 – 10mA Detection concentration range: PH 0 – 14 Detection range of temperature: 0 – 80℃ Response Time: ≤ 5S Stability Time: ≤ 60S Output: Analog Power Consumption: ≤ 0.5W Working Temperature: -10 to +50℃ Working Humidity: 95%RH (nominal humidity 65%RH) Size: 42mm x 32mm x 20mm Weight: 25g     Connection VCC → Arduino 5V GND → Arduino GND PH Output → Arduino A0   Arduino Sketch // Source: https://www.botshop.co.za/how-to-use-a-ph-probe-and-sensor/ float calibration = 30.33; //change this value to calibrate const int analogInPin = A0; int sensorValue = 0; unsigned long int avgValue; float b; int buf[10],temp; void setup() { Serial.begin(9600); } void loop() { for(int i=0;i<10;i++) { buf[i]=analogRead(analogInPin); delay(30); } for(int i=0;i<9;i++) { for(int j=i+1;j<10;j++) { if(buf[i]>buf[j]) { temp=buf[i]; buf[i]=buf[j]; buf[j]=temp; } } } avgValue=0; for(int i=2;i<8;i++) avgValue+=buf[i]; float pHVol=(float)avgValue*5.0/1024/6; float phValue = -5.70 * pHVol + calibration; Serial.print("sensor = "); Serial.println(phValue); delay(500); }  

RM10.00

Put a voltage meter anywhere with this very handy display. This panel meter simply connects to whatever DC supply you are trying to track, easy to wire up! The display has a microcontroller that will read the voltage, compare it to a stable reference and display the voltage on a 3-digit 7-segment display. It works from 3.0V up to 30V and is reverse-polarity protected so it will be good for nearly any electronic project! This particular LED display is a nice vivid red, which we found very readable.   Features Voltage tester for 5V, 9V, 12V or 24V battery   Specifications Display Type: 0.36" LED digital tube, 3 digit LED Color: Red Input Polarity: DC voltage Power Supply: DC 3 - 30V Range: DC 0 - 30V Accuracy: ±1% Speed: >= 500ms Cutout size: 23mm x 14mm/0.9" x 0.55", Thickness: 10mm/0.39" Mounting Hole Center Distance: 28mm Operating Temperature: -10 ℃ - +65 ℃ Reverse protection: Yes   When measured voltage is below 10V: the voltmeter displays two decimal digits, for example, 5.32V When measured voltage is larger than 10V, the voltmeter displays one decimal digit, for example, 10.5V    

RM33.00

  C-series Cylindrical Type Photoelectric Sensor   Features NPN NO (Normally Open) To detect metal object High precision of repeated location Diversified exterior structures  Wide voltage range With short-circuit protection and inverted connecting protection  Minimize interference by visible light Easy to install   Specifications Working Voltage: DC 12V - 24V Cylindrical Type : DC 4 Wires, Cylindrical Type; Supply Voltage : DC 12-24V Current Consumption : 30mA Max. Detection Distance : 11cm Threaded Diameter : 1.75cm Overall Size : 2.7 x 7.2cm (Max.D*L) Shell Material : Metal, Plastic Cable Length : 1.2m Pin-outs Brown - VCC (+) Blue - Ground (-) Black - Output Signal White – Mode  

RM20.00

DC Motor Speed Controller allows controlling both the speed and direction of a DC motor using a Pulse-Width-Modulated (PWM) DC voltage with a Duty Cycle fully adjustable from 0%-100%. The motor speed controller incorporates a high power MOSFET with a heat sink and can easily provide a continuous current of 15A to your DC motor or other DC load. Can be easily interfaced control PWM with Microcontrollers, Arduino Boards, Raspberry Pi etc   Features Adjustable speed with potentiometer or controlled by external 0-5V, and used on PLC to control motor speed directly. Wide range control uses PWM to vary the speed of DC motors. Terminal strip for power & Motor connections. Power-On LED indicator Specifications Working Voltage: DC 5V - 90V Max. continuous current output: 15A Max. Power: 1000W Static Current: 0.005A (standby status) Frequency: 15kHz Speed Adjustment Range: 0%-100% Size: 64 x 59 x 22mm Net Weight: 73g   WARNING: Do not reverse postive and negative power loads, this will damage the controller. 

RM20.00

DC Motor Speed Controller allows controlling both the speed and direction of a DC motor using a Pulse-Width-Modulated (PWM) DC voltage with a Duty Cycle fully adjustable from 0%-100%. The motor speed controller incorporates a high power MOSFET with a heat sink and can easily provide a continuous current of 10A to your DC motor or other DC load.   Can be easily interfaced control PWM with Microcontrollers, Arduino Boards, Raspberry Pi etc Features Adjustable speed with potentiometer or controlled by external 0-5V, and used on PLC to control motor speed directly. Wide range control uses PWM to vary the speed of DC motors. Terminal strip for power & Motor connections. Power-On LED indicator Specifications Working Voltage: DC 12V - 40V Max. continuous current output: 10A Max. Power: 400W Static Current: 0.02A(standby status) Frequency: 13kHz Speed Adjustment Range: 10%-100% Size: 75 * 60 * 28mm Net Weight: 73g   WARNING: Do not reverse postive and negative power loads, this will damage the controller. 

RM300.00

  Applications Autos Solar tracking system Agricultural machinery The wedding system Industrial electric lifting system Chair for medical use Electric wheelchair, Massage Chair, dental chair The medical electric bed, surgical bed, traction bed Electric equipment such as Electric sofa, Electric lifting lever, Electric booth, Electric sunroof, etc   Features Reliable performance Stable running The same characteristics of push and pull Good environment adaptability Heavy Duty and Long Lasting Motor High-quality aluminum alloy material High-performance motor Built-in high quality limit switch   Specifications Rated Voltage: DC 12V No-load current<1A Max load current=3A Stroke Length: 300mm Load capacity: 1000N Speed: 12mm/s Duty cycle: 2 min ON 18 min OFF Material: Aluminum alloy Net weight: 750g   Package Included 1 x Linear Actuator  

RM18.00

Features This soldering iron is small and portable, very easy to operate Stainless steel tip, which is in better anti-rust capability Equipped with long life soldering tip for greater efficiency and long service life Compact, lightweight design with comfortable soft handle reduces operator fatigue Pencil tip type, which is thin and small, very perfect for your soldering needs   Specifications Power: 30W Working Voltage: AC220V / 50Hz  

RM85.00

  It is a customized version of the classic ARDUINO MEGA R3 board, A.K.A RobotDyn MEGA+WIfi. Full integration of microcontroller Atmel ATmega2560 and IC Wi-Fi ESP8266 with 32 MB flash memory, and USB-TTL converter CH340G on one board. All modules can work together or independently.   Specifications Microcontroller ATmega2560 IC Wi-Fi  ESP8266 USB-TTL converter CH340G Power Out 5V-800mA Power IN. USB 5V (500mA max.) Power IN. VIN/DC Jack 9-24V Power Consumption 5V 800mA Logic Level 5V Wifi Wi-Fi 802.11 b/g/n 2.4 GHz USB Micro USB Clock Frequency 16MHz Operating Supply Voltage 5V Digital I/O 54 Analog I/O 16 Memory Size 256kb Data RAM Type/Size 8Kb Data ROM Type/Size 4Kb Interface Type serial\OTA Operating temperature −40С°/+125С° Length×Width 53.361×101.86mm antenna Buil-in\external antenna   Jumper On the board where the switch of mode of operation with 8 position   1 2 3 4 5 6 7 8 CH340 connect to ESP8266 (upload sketch) OFF OFF OFF OFF ON ON ON NoUSE CH340 connect to ESP8266 (connect) OFF OFF OFF OFF ON ON OFF NoUSE CH340 connect to ATmega2560 (upload sketch) OFF OFF ON ON OFF OFF OFF NoUSE CH340 connect to Mega2560 COM3 connect to ESP8266 ON ON ON ON OFF OFF OFF NoUSE Mega2560+ESP8266 ON ON OFF OFF OFF OFF OFF NoUSE All modules work independent OFF OFF OFF OFF OFF OFF OFF NoUSE   Also, have switch for change of connecting port between ATmega2560 and ESP8266 After choosing the mode of the board can proceed to set up the IDE It is important that when the ESP8266 module is programming, it is necessary to press the button “Mode” To begin open the Arduino IDE programming environment and go to settings Then in the window that appears in the row, Additional Boards Manager URLs (marked in red) insert http://arduino.esp8266.com/stable/package_esp8266com_index.json link for installation in Arduino IDE additional scripts that would work with the modules ESP8266 and click OK Then go to the Tools> Board> Boards Manager In the window that appears, scroll through the list down to the script esp8266 by ESP8266 Community and click. In the lower right corner will be able to select the version of the software, select the version 2.1.0 (the newest) and click the Install button After installation, close the window and go to Tools> Board and see the list of available devices on the chip programming ESP8266 Next, you need to select the card as shown in the picture (Generic ESP8266 module) Select the upload speed - 115200   Arduino sketch for test ==========test sketch for ATmega2560=========== void setup() { Serial3.begin(115200); pinMode(13,OUTPUT); delay(500); Serial3.println("AT+CIPMUX=1"); delay(2000); Serial3.println("AT+CIPSERVER=1,5000"); delay(2000); Serial3.println("AT+CIPSTO=3600"); delay(2000); } void loop() { while(Serial3.available()) { char Rdata; Rdata=Serial3.read(); if(Rdata=='A'|Rdata=='a') { digitalWrite(13,HIGH); delay(50); } else if(Rdata=='B'|Rdata=='b') { digitalWrite(13,LOW); delay(10); digitalWrite(13,HIGH); delay(10); digitalWrite(13,LOW); } else { digitalWrite(13,LOW); } } }  

RM130.00

​ Resolution: 480 x 320 pixel Controller: ST7796S   Package Includes 1 x Touch Screen Module 1 x Stylus Pen   Documents Instruction and guide: http://www.lcdwiki.com/3.95inch_Arduino_Display-Mega2560 Arduino sketch & example: 3.95inch_Arduino_Mega2560_8&16BIT_Module_ST7796S_MAR3953_V1.0.zip