A thermoelectric cooling (TEC) module is a semiconductor-based electronic component that functions as a small heat pump. By applying DC power source to a TEC, heat will be transferred from one side of the module to the other. It creates a cold and hot side. They are widely used in industrial areas, for example, computer CPU, CCDs, portable refrigerators, medical instruments, and so on.
Applications – Obstacle Detector Sensor, Line Following Sensor, Proximity Sensor 10-12cm range. Potentiometer for maximum range setting. Can be used to differentiate between black and white (Can be used for line sensing) Onboard LED indication for detection Works on 5V or 3.3V input. TTL compatible output
Voice record module is base on ISD1820, which a multiple-message record/playback device. It can offer true single-chip voice recording, no-volatile storage, and playback capability for 8 to 20 seconds. The sample is 3.2k and the total 20s for the Recorder.