The HC-SR501 is the most common PIR (Passive Infrared) motion module in hobby electronics, and beyond the basic "detect movement" wiring, it has two…
Before reaching for an I2C sensor like the MAX30100, the classic analog Pulse Sensor is a simpler, cheaper starting point for reading heart rate — a…
The MAX30100 combines red and infrared emitters with a photodetector for experiments with pulse and oxygen-saturation algorithms. The part is obsolete…
A 3D printer builds a physical object the same way it appears on screen, one thin horizontal layer at a time, until a three-dimensional shape emerges…