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  

RM25.00

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. 

RM25.00

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  

RM6.00

  Nozzle is the part on the 3D printer that actually extrudes the filament to build the part. MK8 printer nozzels, one of each size 0.2/0.3/0.4/0.5mm. Ideal for printing 1.75mm ABS or PLA.  Nozzles are made of high quality brass.   Specifications Size: 13 x 6mm Material: Brass Nose Length: Short-nosed Nozzle widths: Narrow-nosed Compatible: Makerbot  

RM8.00

  When the piezoelectric ceramic shocking will generate an electrical signal, for Arduino Controller analog port can be perceived slight vibration signals, Also can be vibration interactions related works, such as electronic drums.   Descriptions Working Voltage: 3.3V or 5V Working Current: Less than 1mA Operating Temperature Range: -10 ~ + 70 Degrees Celsius Interface Type: Analog Output Item Size: 30mm x 23mm   Pins S signal output + power supply (VCC) - ground (GND) Input Positive of the piezoelectric ceramic GND Negative of the piezoelectric ceramic    Package Included 1 x Piezo Sensor 1 x Signal Amplifier Module   How to use Analog_Piezoelectric_Ceramic_Vibration_Sensor  

RM48.00

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 LCD display Support high and low level trigger Support button trigger Emergency stop function Sleep mode,Wake up with any button Automatically save parameters Support UART Set Independent of parameters With case, beautiful and practical Support reverse connection protection Delay high precision Continuously adjustable from 0.01 seconds to 9999 minutes Optocoupler isolation.Enhanced anti-jamming capability Multiple parameters are displayed simultaneously   Specifications Product Number: XY-WJ01 Working Voltage: DC 6V – 30V Load Current: 10A(Max) Timing Range: 0.01 sec ~ 9999 min Idle Current: 15mA Working Current: 50mA Maximum Output load: DC 30V 5A and AC 220V 5A Service life: more than 100,000 times;  Working temperature: -40~85℃ Operating Humidity: 5%-99%RH Trigger signal source: High trigger (3.0V~24V) Low trigger (0.0V~0.2V) Switching control (passive switch) Reverse Protection: Yes Physical Dimension: 79*44*26mm   Functions Trigger delay Module will began to delay after get a trigger signal.And output terminal status will change after delay.This function can be used in circuit protect form misoperation or prevent instantaneous high current. Cycle timing The load switch changes state according to the specified time after set cycle time. Delayed power off If use need control a light that need it power off after some time.This module can meet this function. Circuit switch Protect the circuit from damage caused by prolonged operation.   Working mode P0: Relay will keep ON for time OP after get trigger signal and then relay OFF;The input signal is invalid if get trigger signal again during delay time OP. P1: Relay will keep ON for time OP after get trigger signal and then relay OFF;Module will restart delay if get trigger signal again during delay time OP. P2: Relay will keep ON for time OP after get trigger signal and then relay OFF;Module will reset and stop timing if get trigger signal again during delay time OP. P3: Relay will keep OFF for time CL after get trigger signal and then relay keep ON. P4: Relay will keep ON for time OP after get trigger signal and then relay keep OFF for time CL and then loops the above action.Module will reset and stop timing and relay will keep initial state if get trigger signal again during loops.The number of cycles (LOP) can be set.Relay will keep OFF if end loop. P5: Relay will keep OFF for time CL after get trigger signal and then relay keep ON for time OP and then loops the above action.Module will reset and stop timing and relay will keep initial state if get trigger signal again during loops.The number of cycles (LOP) can be set.Relay will keep ON if end loop. P6: Relay will keep ON for time OP after power on without get trigger signal and then relay keep OFF for time CL and then loops the above action.The number of cycles (LOP) can be set.Relay will keep OFF if end loop. P7: Relay will keep OFF for time CL after power on without get trigger signal and then relay keep ON for time OP and then loops the above action.The number of cycles (LOP) can be set.Relay will keep ON if end loop. P8: Signal hold function.Reset delay time and relay keep ON if keep get trigger signal.Relay OFF when the signal disappears after delay time OP.Reset delay time when get trigger signal again during timing. P9: Signal hold function.Reset delay time and relay keep OFF if keep get trigger signal.Relay ON when the signal disappears after delay time CL.Reset delay time when get trigger signal again during timing P0~P7 mode: System will start to delay if short press button ‘Pause’ when system does not get trigger signal.Display screen will display ‘OUT’ and flashing and Relay OFF when Pause timing if the system has been timed. P8~P9 mode: Other buttons cannot be used when ‘Pause’ button as a trigger signal in running interface.   Timing Range Continuously adjustable from 0.01 seconds to 9999 minutes. Enter the settings interface when short press button ‘Pause’ in the OP / CL parameter modification interface(Flashing) to select timing range. Pay attention to the position where the decimal point moves when the button is pressed. Display ‘XXXX’. No decimal point, the timing range is 1 second ~ 9999 seconds. Display ‘XXX.X’. The decimal point is the penultimate, timing range is 0.1 second to 999.9 seconds. Display ‘XX.XX’. The decimal point is the third last, timing range is 0.01 second to 99.99 seconds. Display ‘X.X.X.X’. The decimal point is fully lit, timing range is 1 minute to 9999 minutes. For example, if you want to set the OP to 3.2 seconds, move the decimal point to the penultimate position, LCD will display ‘003.2’. Description OP: Turn On time; CL: Turn OFF time; LOP: Number of cycles.Range is 1-9999tims.’----’ means unlimited loop. Setting Long press:keep press button for more than 3second. 1 Enter set parameter menu by long press button 'SET'. 2 Work mode will flash at first set the working mode.Short press the UP/DOWN button to set the working mode. 3 Short press the SET button to select the working mode and enter the system parameter settings. 4 In the system parameter setting interface, short press the ‘SET’ button to switch the system parameters to be modified, short/long press the UP/DOWN button to modify value; Note:Short press ‘SET ’ is invalid at mode P0,P1,P2,P3,P7,P8. 5 Enter setting interface when short press button ‘Pause’ in the OP/CL parameter modification interface(Flashing) to select timing range (1s/0.1s/0.01s/1min). 6 Save the parameter settings and exit the settings interface when long press ‘SET’ button after all the parameters are set.   Additional Features Auto sleep function: Long press button 'Pause' in the normal running interface(P0~P7) to turn on or off auto sleep function. L-P:ON,Turn ON auto sleep function.About five minutes, no operation, the LCD backlight automatically turns off.It can be wake up by any buttons. L-P:OFF,Turn OFF auto sleep function. View parameters: In the running interface, short press the SET button to display the current parameter settings of the system, which does not affect the normal operation of the system. Switch the display parameter: It will switch the display content by short press button 'DOWN' in the P5~P6 mode(Parameter is Run time or number of cycles)   UART Communication and Parameter Settings The system supports UART data upload and parameter setting functions (TTL level); UART: 9600, 8, 1 NO.    Command    Function 1    Read    Read the parameter setting 2    OP:XXXX    Set the minimum delay time for turn ON : 1s 3    OP:XXX.X    Set the minimum delay time for turn ON : 0.1s 4    OP:XX.XX    Set the minimum delay time for turn ON : 0.01s 5    OP:X.X.X.X    Set the minimum delay time for turn ON : 1min 6    CL:XXXX    Set the minimum delay time for turn OFF : 1s 7    CL:XXX.X    Set the minimum delay time for turn OFF : 0.1s 8    CL:XX.XX    Set the minimum delay time for turn OFF : 0.01s 9    CL:X.X.X.X    Set the minimum delay time for turn OFF : 1min 10    LP:XXXX    Number of cycles:1-9999 11    Start    Trigger/Start(Just for P0~P7) 12    Stop    Pause(Just for P0~P7) 13    PX    Set mode P0~P9   Note This is a relay output and cannot be used as a power module. It cannot output voltage. The load needs to be connected to a separate power supply.   Package 1pcs XY-WJ01 Delay Relay Module   ---------------------------------------------------------------------- ----------------------------------------------------------------------  

RM12.00

UK IEC Power Cord with C19 to BS 1363 Connection for Powering Network Devices This BS 1363 power cord is designed for blade server chassis, switches, routers, PDUs, UPS systems and other network devices. It features a BS 1363 plug for connecting to a wall outlet and a C19 plug for connecting to a device. The length allows you great flexibility in placing equipment with respect to the power outlet.   Features BS1363 to C13 cable for powering computers, servers and other network devices 6 ft. (1.8 m) length allows flexibility in placing devices in relationship to AC outlet Ideal replacement for worn-out or missing kettle, computer, any electronics power cable Included a 13A fuse    

RM28.00

UK IEC Power Cord with C19 to BS 1363 Connection for Powering Network Devices This BS 1363 power cord is designed for blade server chassis, switches, routers, PDUs, UPS systems and other network devices. It features a BS 1363 plug for connecting to a wall outlet and a C19 plug for connecting to a device. The length allows you great flexibility in placing equipment with respect to the power outlet.   Features Recommended for powering switches and other network devices BS 1363 plug connects to AC power; C19 plug connects to device’s C20 inlet UK power cable is ideal for a replacement for worn-out or missing cord 1.8 meters length allows you greater freedom in placing devices away from outlet    

RM28.00

C20-to-C19 Power Cable for Network Devices That Require a Heavy-Gauge Connection This heavy-duty extension cord features 14 AWG wire suitable for high power connections, making it a reliable solution for large server applications that require a higher-rated, heavier-gauge cable. This cord can be used to connect a server, router, network switch or blade server enclosure to a UPS system or PDU or replace or upgrade the standard power cord provided by the device’s manufacturer. The length helps reduce cable clutter and minimize the risk of tripping.   Features Recommended for powering servers, routers and other high-output network devices 1.8 meters length allows flexibility in placing devices, while avoiding cable clutter C20 to C19 cord replaces or upgrades standard power cord provided by manufacturer Thick 14 AWG wire gauge manages high power levels required for larger equipment    

RM28.00

C19 to C14 Power Cord for Network Devices That Require a Heavy-Gauge Connection This C14 to C19 cable features 14 AWG wire suitable for high power connections, making it a reliable solution for large server applications that require a higher-rated, heavier-gauge cable. The C14 to C19 power cable can be used to connect a computer, server or drive to a UPS system or PDU or replace or upgrade the standard power cord provided by the device’s manufacturer. The length helps reduce cable clutter and minimize the risk of tripping.   Features C19 to C14 cable for powering computers, servers and other network devices 1.8 meters allows flexibility in placing devices, while avoiding cable clutter Heavy-duty cable replaces or upgrades standard power cord provided by manufacturer Thick 14 AWG wire gauge manages high power levels required for larger equipment    

RM58.00

Widely used in general industry equipment, medical equipment, chemical equipment, farming (lawn and garden), tour vehicles, special vehicle, ship, beverage, vehicle cleaning, carpet cleaning, ground cleaning, water purification and water treatment equipment.   Features High-temperature protection High pressure Low power consumption Long life span     Specifications Maximum flow: 4 Liter per Minute Maximum pressure: 1MPa Maximum current: 3.5A Water Inlet & Outlet Diameter: 9mm Rated voltage: DC 12V Working voltage: DC 9 – 14.4V Power consumption: 45W Maximum working temperature: ≤ 50°C Size: 15.7cm x 9.5cm x 6cm.    

RM330.00

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 1GB LPDDR4-2400 SDRAM 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  

RM110.00

You can turn on/off the receiver with transmitter (remote control) from any place within a reliable distance; the wireless RF signal can pass through walls, floors and doors. Control Lights, Motors, Fans, electrically operated Doors/Locks/Windows/Blinds/Cars or Other Appliances with DC12V.   Wireless Receiver Controller Channel: 12 Channel Operating voltage: DC12V Operating temperature: -40℃ ~ +80(℃) Receiving sensitivity: ≥-105dBm Case Dimension: 74 x 53 x 30mm Receiving distance: 100 – 200m (200m max for open space)   SELECT OPERATING MODE Press the button on receiver board until LED blink once then release. Press remote button 1 button now for latching mode Press remote button 2 button once for momentary mode Press remote button 3 button for interlock mode Press remote button 4 button for semi latching (1 ~ 6) & semi momentary (7 ~ 12) mode Press remote button 5 button for semi latching (1) & semi momentary (2 ~ 12) mode Long press button on receiver board around 8 second (Long beep from buzzer) will clear the receiver board memory; After this will require to pair with any remote again, maximum can pair up-to 30 remote control.   PROGRAM MODE IN Momentary = Single relay will stay on only as long as the certain remote button is pressed. Latching = Press any remote button for on, press same key again for off, each relay independently on/off. Interlock = Only one relay will on; press another button for on another relay and pervious relay will turn off. Package Included 1 x Receiver 1 x Transmitter      

RM78.00

You can turn on/off the receiver with transmitter (remote control) from any place within a reliable distance; the wireless RF signal can pass through walls, floors and doors. Control Lights, Motors, Fans, electrically operated Doors/Locks/Windows/Blinds/Cars or Other Appliances with DC12V.   Wireless Receiver Controller Channel: 6 Channel Operating voltage: DC12V Operating temperature: -40℃ ~ +80(℃) Receiving sensitivity: ≥-105dBm Case Dimension: 74 x 53 x 30mm Receiving distance: 100 – 200m (200m max for open space)   SELECT OPERATING MODE Press the button on receiver board until LED blink once then release. Press remote button 1 button now for latching mode Press remote button 4 button once for momentary mode Press remote button 2 button for interlock mode Press remote button 3 button for semi toggle (1,2,3) & semi momentary (4,5,6) mode Long press button on receiver board around 8 second (LED blink twice) will clear the receiver board memory; After this will require to pair with any remote again.   PROGRAM MODE IN Momentary = Single relay will stay on only as long as the certain remote button is pressed. Latching = Press any remote button for on, press same key again for off, each relay independently on/off. Interlock = Only one relay will on; press another button for on another relay and pervious relay will turn off. Package Included 1 x Receiver 1 x Transmitter