-
Pulse sensor is used to test heart rate sensors. Students, artists, athletes, creators, games or mobile terminal developers can develop heart-related and interactive works. Sensor can be worn on the finger or earlobe, It also has an open-source app program, you can put your real-time heart rate displayed by the graph. In essence, a heart rate sensor integrated optical amplifier and noise elimination circuit.
-
WTV020-SD-16P is a low cost and easy to use MicroSD MP3 module which supports WAV and AD4 formats. It support upto 1GB SD cards. It requires a 3.3V power supply for its operation and its power consumption is very low. You can easily copy voice files to SD Card using PC and it should be in FAT format. This module can be easily interfaced with Arduino Boards, Microcontrollers etc. It can also be used as standalone without any MCU. Please read the datasheet carefully before using this module.
-
4-channel relay output modules, relay output contacts 250A 10A. Input IN1, IN2, IN3, IN4, the signal line LOW effective. VCC, GND power input, can relay a separate power supply relay power input of JD-VCC. Uses: support all MCU control. the industrial sector PLC control smart home control Wiring: VCC: positive power supply system GND: System power supply negative IN1 - IN4: relay control ports