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In this particular case, it’s a DIY USB polygraph-like machine by [Juangg] using an Arduino and sensors on the hardware side, ... a breath sensor, and one to measure Galvanic Skin Response (GSR).

The breathing sensor I built conssited of a stretch resistive sensor made from an ohmic rubber cord around a bungie cord. ... This was an easily measured change using an Arduino Uno.

IR Sensor Pinout. The IR sensor has a 3-pin connector that interfaces it to the outside world. The connections are as follows: VCC is the power supply pin for the IR sensor which we connect to the 5V ...

Additionally, they offer example code for the Arduino mmWave Library for XIAO and loading instructions on GitHub. The Seeed Studio 60GHz mmWave human fall detection and breathing and heartbeat ...