Even though Attiny85 is fitting here, I opted for Digispark just because of its plethora of features like USB programming interface, on-board voltage regulator, and Arduino IDE compatibility. The code ...

Light Gauge. Pressure Sensor. Proximity Detector. Transmitter and Receiver. Velostat. Vernier Shield. ... The SW-420 Vibration Sensor will detect large disturbances and send the data to the Arduino.

We’re still not sure exactly how [connornishijima]’s motion detector works, though many readers offered plausible explanations in the comments the last time we covered it. It works well… ...