RM10.00

Description: TP5100 is a Lithium battery management chip. It is capable of charging a single lithium-ion cell or two lithium-ion cells wired in series at the same time. It is designed for a double 8.4V / 4.2V single lithium-ion battery. This Li-ion Battery charging module comes in a small package making it ideal for portable devices. It has an in-built input overcurrent, under-voltage protection, over-temperature protection, short circuit protection, battery temperature monitoring, and reverse battery protection.   Technical Specifications: Dual-cell 8.4V/Single-cell 4.2V Input voltage: 5V-15V DC  Switching frequency: 400kHz Red LED: Charging indicator Blue LED: Full charge/ No battery indicator Both Red/Blue LED off: VIN very low/High-temperature shutdown No need for external anti-backflow Schottky diode Onboard solder jumper to set 1S/2S mode Option for an external bicolor LED     Additional Resources: TP5100 8.4V/4.2V  Li-ion Battery Charging Module datasheet (https://voltiq.ru/datasheets/TP5100-datashhet.pdf ) TP5100 1S/2S Li-ion Battery Charger – Quick Review! (https://www.codrey.com/electronic-circuits/tp5100-1s-2s-li-ion-battery-charger-quick-review/ )

RM245.00

Product Description: Name of the product: Soil pH sensor Probe type: probe electrode Measurement parameters: Soil pH value Measuring range: 3 ~ 9 pH measurement accuracy: ±0.3PH Resolution: 0.1pH output signal: RS485  Supply voltage: 9 ~ 24VDC Operating temperature range: 0°C ~ 55°C Stabilization time: 5-10 seconds after power Reaction time: <1 second sealing material: ABS engineering plastic, epoxy resin waterproof grade: IP68 Cable specifications: Standard 1.2 meter (can be customized for other cable lengths, up to 1200 meters)  

RM135.00

Product Description: Name of the product: Soil moisture sensor Probe type: probe electrode Measurement parameters: Soil moisture  Measuring range: 0 ~ 100% measurement accuracy: 0-50%: ±2% 50-100%: ±3% Resolution: 0.01% output signal: RS485  Supply voltage: 9~24VDC Operating temperature range: -40°C~85°C Stabilization time: 5-10 seconds after power Reaction time: <1 second sealing material: ABS engineering plastic, epoxy resin waterproof grade: IP68 Cable specifications: Standard 1.2 meter (can be customized for other cable lengths, up to 1200 meters)  

RM165.00

Product Description: Name of the product: Soil NPK sensor Probe type: probe electrode Measurement parameters: Soil NPK value Measuring range: 0 ~ 1999 mg/kg measurement accuracy: ±2%FS Resolution: 1 mg/kg  output signal: RS485  Supply voltage: 9~24VDC Operating temperature range: -30°C~70°C Stabilization time: 5-10 seconds after power Reaction time: <1 second sealing material: ABS engineering plastic, epoxy resin waterproof grade: IP68 Cable specifications: Standard 1.2 meter (can be customized for other cable lengths, up to 1200 meters)   Measure Soil Nutrient using Arduino & Soil NPK Sensor

RM120.00

The electronic ink screen uses the "microcapsule electrophoresis display" technology for image display. Its working principle is that the charged nanoparticles suspended in the liquid undergo the action of an electric field to migrate, and reflect under ambient light to form a display effect close to that of traditional printing paper. The electronic ink screen can clearly display the picture without a backlight, and the viewing angle is almost 180°. Specifications: MH-ET Live: Waveshare 3 color display equivalent Electronic Paper Module for Arduino / Raspberry Pi Low Power Consumption Wide Viewing Angle Three Color Display 3 Wire and 4 Wire SPI Communication 212 X 104 resolution Size: 71.6mm X 38.3mm Operating voltage: 3.3V / 5V Tutorial

RM6.00

WS2812 is a intelligent control LED light source that the control circuit and RGB chip are integrated in a package of 5050 components. It internal include intelligent digital port data latch and signal reshaping amplif ication drive circuit.   Description: Chip: WS2812 (built-in LED) LED: 5050 RGB full color highlight package Voltage: 5V Port: Digital Platform: for Arduino and Raspberry Pi microcontroller 5050 highlight LED, built-in control chip, only an IO port to control multiple LED Chip built shaping circuit, signal distortion is not cumulative, stable display Adjust brightness tricolor 256, 16,000,000-color TFT display, scanning frequency of not less than 400Hz / S Serial even level interface, via a signal line to complete the reception and decoding of data Refresh rate of 30 frames / sec, even low-level mode even series of not less than 1024 points Send and receive data at speeds up to 800Kbps Highlight LED, light color high brightness consistency Both ends even level interface, can be connected directly   8-Bit: Length: 57.1mm Width: 10.6mm Weight: 3g   16-Bit (4x4): Length: 30.3mm Width: 30.3mm Weight: 6g 25-Bit (5x5):  Length: 38.9mm Width: 38.9mm Weight: 8g   Tutorial:  How to Control WS2812B Addressable RGB LEDs using Arduino  

RM38.00

Features With a wide input voltage range from 6V to 40V, the step-down converter can accurately adjust output voltage and current. The efficiency can be up to 96%, measured at 20A, converting 24V to 12V. It is designed with 75V/80A large current dual MOS tube. Input and output use high frequency low resistance electrolytic capacitor, low ripple, stable output. Wiring is convenient with these large current 30A screw terminals. The buck module has 2 heat sinks that could enhance heat dissipation. When there is a big difference between input and output voltage, please decrease power and current.   Specifications Input Voltage: 6V to 40V DC(10V to 40V is suggested) Output Voltage: 1.2V to 36V DC Output Current: 20A(max.), 15A(suggested) Efficiency: 95%(24V to 12V, 20A) Output Ripple: ≤50mV Wiring Method: Terminal Short Circuit Protection: Self-recovery(cannot short circuit for a long time) Size: 60 x 53 x 27mm / 2.36 x 2.08 x 1.06" When input and output are commonly grounded, no-load CV output constant voltage, CC output constant current   Output current adjustment method: Adjust the CV potentiometer and set the output voltage to the voltage you need according to your load requirements. Set the CC potentiometer counterclockwise for about 30 turns (ie set the output current to the minimum), connect the LED, and adjust the CC potentiometer to the current you need. For battery charging, after the battery is discharged, it will be connected to the output and adjust the CC to the current you need. (Be sure to use the discharged battery when charging, because the battery is left in the battery.) More, the charging current is smaller.)   VO+: Output positive VO-: Output negative +IN: Input positive -IN: Input negative CV: Output voltage adjustment CC: Output current adjustment EN: Enable, low voltage level shut off output; suspension, high voltage level is effective

RM1.50

Donut (Perf) board is designed to map out circuit ideas as an alternative to breadboard or soldering. Components can be tied or fixed to the holes and interconnected with hook-up wires to form the circuit.   Features Prototype circuit ideas quickly and easily Matrix board enables components to be set using pins and wires by hand SRBP base material is very easy to cut to the required size with simple tools   Specifications Material: Fiber Glass-Reinforced Epoxy Board Double Sided (Individual hole) Hole-to-hole distance: standard 100mil or 2.54mm (pitch-to-pitch) Color: Green All holes are plated through. All holes are thorough, smooth, and clear. Suitable for large, medium, and small projects, widely used for Arduino, various electronic and welding projects, ideal circuit boards for electronic DIY enthusiasts.

RM48.00

The EMI filter PCB specification is FR4 50X50X1.6MM, which can be combined into a multi-stage EMI filter, the shortest design of the large current line, the short path, can withstand larger currents, and has less interference to the outside world, which is better than the design of the general long stripboard. The 50X50MM square plate has high mechanical strength, is not easy to bend and deform, and it is convenient to add a shielding cover. Common mode inductors have three specifications of 2A, 4A, and 18A. 18A: EMI filter, load power 3960W.   This module can be used with a decoder or a power amplifier to filter the high-frequency noise of the power supply, eliminate interference from the mains, and purify the power supply. It can significantly improve the sound quality of the power amplifier, increase the resolution and make the background quiet.   The input GND needs to be connected to the ground wire of the power cord, and can also be connected to the chassis shell. Depending on the specific situation, please pay attention to the direction when soldering the 4A common mode inductor. Please install and solder according to the label on the circuit board and the baby picture.   The following are some common sense of high-frequency electromagnetic interference EMI filters. For high-frequency electromagnetic interference (EMI), generally, three technologies can be used for power filtering to suppress interference noise. In actual use, two or even multiple technologies are often mixed. They are: 1. Add a capacitor between the live wire and the neutral wire of the power supply, that is, the X capacitor. Choose X2 type, the main function is to eliminate common mode interference, the capacity range is 0.01UF---0.47UF. 2. Add a capacitor between the power line and the ground line, that is, the Y capacitor. The Y2 type is selected to mainly eliminate the interference of cross-talk, and the capacity range is 2200pF～0.1μF. In order to reduce the leakage current, the capacitance should not exceed 0.1μF, this circuit board chooses 0.01UF. 3. Common mode suppression, common mode inductance (suppression coils on the two power lines), when the rated current is large, the wire diameter of the common mode choke coil should be correspondingly increased so as to be able to withstand a large current. In addition, an appropriate increase in inductance can improve the low-frequency attenuation characteristics. This line uses 10MH  

RM7.00

Description DC power supply filter board Digital power amplifier interference suppression board Automotive power supply EMI suppression, current 4A, can meet The current of the TPA3116 machine makes the power input more pure, so the amplifier is less noisy.   Product parameters: Working voltage: 0-50V    Pin definition, interface description: Vin+: input positive end Vin-: input negative Vout+: output positive end Vout-: negative output 

RM14.00

EMI filter module is a filter module that can let the useful low-frequency signal pass smoothly and weaken the high-frequency electromagnetic interference. It can improve the sound purity, reduce the noise generated by ac power interference. Filtering voltage: 220V Maximum current: 2A   Specification:  Model Number: EMI Filter Sound Booster Application: Electronic experiment Operating Temperature: -40℃ ~ +85℃ Supply Voltage: 220V Dissipation Power: 2A   Product Interface Description:

RM30.00

Features: Wide range of applications: DIY self-made spray, plant humidification, landscaping atomization Large fog volume, fine fog particles, high fog spray A variety of spray modes, switch at will, suitable for different functional needs Reasonable circuit board design, original electronic components, stable performance Double spray head design, large fog volume and wide coverage Product parameters: Name: Atomization drive circuit board Rated voltage: DC 5V Rated current: 300mA Power: 2-3W Resonant frequency: 108-110KHz Precautions: Do not modify the circuit board without permission Do not overload input power The circuit board should not be exposed to water and damp Must be used together with the same frequency atomizing tablet Shipping list: Driver board * 1 Atomizer tablet* 2 Cotton swab* 2

RM50.00

This ultrasonic fog module can be easily used to create fog. To make the fog, the stick must be placed in water with one side and the piezo disc must be held on the other end. Specifications: Supply voltage: 5V DC Current draw: ~300mA Vibration frequency: 108KHz±2KHz Dimensions PCB: 50 x 25mm Shipping list: Driver board * 1 Atomizer tablet* 4 Cotton swab* 4

RM4.00

Description: The TP4056 is a complete single-cell Li-Ion battery with a constant current/constant-voltage linear charger. The SOP40 package with the heatsink on the bottom of the TP4056 and fewer external components make the TP4056 ideal for portable applications. The TP4056 is suitable for USB power and adapter power supplies.   Due to the internal PMOSFET architecture and anti-reverse charging path, no external isolation diodes are required.   Thermal feedback automatically adjusts the charge current to limit chip temperature during high power operation or high ambient temperature conditions. The charging voltage is fixed at 4.2V, and the charging current can be externally set by a resistor. When the charging current drops to the set value of 1/10 after reaching the final float voltage, the TP4056 will automatically terminate the charging cycle. When the input voltage (AC adapter or USB power) is removed, the TP4056 automatically enters a low current state, reducing the battery leakage current to less than 2uA. The TP4056 can also be placed in shutdown mode when there is a power supply, reducing the supply current to 55uA.   Other features of the TP4056 include battery temperature sensing, Undervoltage lockout, automatic recharge, LED status pins for charging, and termination. Specification: 100% brand new and high quality  Size: approx.28x17.3x1mm Charge module: Linear charging.  Current:1A adjustable.  Charge precision:1.5%.  Input voltage:4.5V-5.5V.  Full charge voltage:4.2V ± 1% Led indicator: red is charging Green is fully charged.  Input interface:micro USB/mini usb/type-c usb Work temperature:-10° to +85°.  Inversed polarity: NO. The battery overcharge protection voltage: 4.28 V Battery overcharge lifting voltage: 4.00 V The battery discharge protection voltage: 3.0 V Battery discharge termination voltage: 3.2 V Battery: over-current protection current 3 a Ampere meter can only be connected to the 5v input end of the module. It is better than the charging current is 37% of the battery capacity. If you charge the battery of 1000mAH, the current of 400 is enough. If the input voltage is too high, like 5.2v, the current will be less than 1000mA, it is normal. It is a protection function, auto-subtract the charging current to avoid burn damage to the chip. NO reverse polarity protection.   Suitable for: Charge and Discharge Lithium cells Commonly used with 18650 Li-ion batteries Portable electronics Power banks Used with 5V booster for powering Arduino projects   Package Included: 5V 1A USB Type C Lithium Battery Charger TP4056 with Protection IC x 1     Suggestions Battery Holder 18650 3.7V (1x2) Case w/ Wire Lead   Lithium Ion (Li-ion) 18650 3.7V 4800mAh Rechargeable Battery

RM40.00

This is an ultrasonic mist maker/humidifier also called an ultrasonic atomizer used to generate mist and eliminate bad smell.  This mist maker can add a stunning mist effect to your pond or water tank to filter the bad smell with electronic and ultrasonic technology.  Atomized mist is generated in a large amount and the service life of atomizer is long. Ideal of good decorative effect, in the rockery, fountain, potted landscape. Great for you to buy one. Features: No heat or chemicals used. Ideal for indoor or outdoor fountains, water feature, and office use. Easy to operate, put in the water and the voltage is 24V, then the mist appears. Perfects for use it in your pond, rockery, fishtank, vase, birdbath, etc, then it will create a magical atmosphere. This mist maker can add a stunning mist effect to your pond, rockery or water tank to filter the bad smell with electro and ultrasonic technology. Specifications: Operating voltage: 24 (V) Power: 19 (W) (sign 1W) Atomization amount:> 400cc / har Operating frequency: 1700 ± 50 (KHZ) Transducer plates diameter: 2cm Effective level: 20mm ~ 75mm Working temperature: 5 ~ 45  Celsius Lantern: No light water level sensor switch: Font door high H1.2cm Atomizing head diameters: 4.5cm High: 3.5cm Plug Type: 5.5 × 2.1mm female plug Suitable For: Family, air-conditioned rooms, beauty salons, hotels, hospitals, offices, kindergartens and other living spaces. Points for attention: 1. Do not turn over the mist maker when the switch is turned on, keep upright, or it may damage the atomizer. 2. Please ensure that the daily running time is less than 10 hours, otherwise the life of atomizing slice will be shorted. 3. Don't touch the atomizing slice while the Mist Maker is working. 4. Ensure the water at high quality, use clean tap water (water quality deterioration may influence the lifetime). 5. Please switch off the power before Movement or maintenance. 6. The atomizing slice is consumable, and its service life is=3000 hours. If marked reduction of Mist present, please clean atomizing slice with a cotton swab (don't need to use any detergent), keep it clean. 

RM15.00

This ultrasonic fog module can be easily used to create fog. To make the fog, the stick must be placed in water with one side and the piezo disc must be held on the other end. Specifications: Supply voltage: 5V DC Current draw: ~300mA Vibration frequency: 110KHz Size mist droplets: 1 ~ 5 micron Connector (piezo disc): JST-PH Dimensions PCB: 31 x 18mm Dimensions piezo disk: Without silicone ring: 16mm With silicone ring: 20mm Package contents: 1x Ultrasonic Mist Module 1x Piezo disc 1x Water transport stick

RM16.00

About this item The esp8266 breakout board can expand one GPIO pin of the esp8266 development board to two. Convenient to reuse all pins in smart home DIY projects. Breakout board can expand one GPIO pin of the ESP8266 development board to two, which is very nice for you to reuse all pins, it is a good tool for your smart home projects. Nice breadboard alternative The expansion board is a double-layer board. One pin is wired on both sides. ESP8266 breakout board GPIO 1 into 2 only can compatible with ESP8266, and scalable to a variety of applications, pin header & screw terminal. Just select them according to your purpose. The circuit is stable and highly reliable, and there will be no poor circuit contact and unstable signal transmission.

RM35.00

Overview: This sensor is a carrier/breakout board for ST’s VL53L1X laser-ranging sensor, which offers fast and accurate ranging up to 4 m. It uses the time of flight (ToF) of invisible, eye-safe laser pulses to measure absolute distances independent of ambient lighting conditions and target characteristics like color, shape, and texture (though these things will affect the maximum range). The VL53L1X also features a programmable region of interest (ROI), so the full field of view can be reduced or divided into multiple zones. Distance measurements can be read through a digital I²C interface. The board includes a 2.8 V linear regulator and level-shifters that allow it to work over an input voltage range of 2.6 V to 5.5 V, and the 0.1″ pin spacing makes it easy to use with standard solderless breadboards and 0.1″ perf boards.   Features and specifications: Dimensions: 0.5″ × 0.7″ × 0.085″ (13 mm × 18 mm × 2 mm) Weight without header pins: 0.5 g (0.02 oz) Operating voltage: 2.6 V to 5.5 V Supply current: ~15 mA (typical average during active ranging at max sampling rate) Varies with configuration, target, and environment; peak current can reach 40 mA Fast and accurate ranging with three distance mode options: Short: up to ~130 cm, 50 Hz max sampling rate; this mode is the most immune to interference from ambient light Medium: up to ~300 cm in the dark, 30 Hz max sampling rate Long: up to 400 cm in the dark, 30 Hz max sampling rate Minimum range: 4 cm (objects under this range are detected, but measurements are not accurate) Emitter: 940 nm invisible Class 1 VCSEL (vertical-cavity surface-emitting laser) – eye-safe Detector: 16×16 SPAD (single photon avalanche diode) receiving array with integrated lens Typical full field of view (FoV): 27° Programmable region of interest (ROI) size on the receiving array, allowing the sensor FoV to be reduced Programmable ROI position on the receiving array, allowing multizone operation control from the host Configurable detection interrupt thresholds for implementing autonomous low-power presence detection: target closer than threshold target farther than threshold target within a distance window target outside of distance window no target Output format (I²C): 16-bit distance reading (in millimeters)   datasheet

RM12.00

50 Ohms coax cable with UV and weather-resistant jacket. Great for antenna feeder jumper assemblies runs requiring a high-performance, flexible, low loss RF cable. SPECIFICATION: ENVIRONMENT:OUTDOOR JACKET:PE OVERALL DIAMTER(MM):6.096MM Operating Temp.°C (°F):-40° TO 85°C Max Frequency (GHz):6 GHZ Impedance (ohms)：50 ohms OFFER PRICE RM12/METER      

RM30.00

The NANO is a small and breadboard-friendly version of the Arduino Uno. The compatible use a original ATMEGA328 chip and is 100% compatible with the original Nano. The Arduino NANO 3 is based on the 32kB Atmega328P-AU with 16MHz and a USB-C port. The ATmega328 has 32 KB (2 KB used for the bootloader).   Specifications:  Microcontroller: ATmega328 USB Chipset: CH340 USB Connector: USB Type-C Logic Level: 5V Input Voltage: 5 ~ 12V Digital I/O Pins: 14 (of which 6 provide PWM output) Analog Input Pins: 8 DC Current per I/O Pin: 40mA Flash Memory: 32KB (ATmega328) of which 2 KB used by bootloader SRAM: 2KB (ATmega328) EEPROM: 1KB (ATmega328) Clock Speed: 16MHz Dimensions: 44 x 18mm Net Weight: 30g   Resources: CH340 Drivers for Windows, Mac and Linux Schematic Arduino IDE Getting Started Arduino Forum   Package Included: 1 x NANO 3 5 USB Type-C - CH340 - Compatible with Arduino®