The SparkFun Ultrasonic Distance Sensor - TCT40 (sen-24805) a user-friendly upgrade to the popular HC-SR04 sensor, offers non-contact distance measurement from 2cm to 400cm with an accuracy of 3mm.

Get close enough to this raven and you’ll set off the PIR sensor, which triggers lighting ... This bird’s brain is an Arduino Nano, which is protected from the 12V supply with a boost converter.

the Arduino library for the Air Purification Combo ONE (APC1) sensor with UART or I2C interface from ScioSense. The APC1 is a compact, box-shaped, all-in-one environmental sensor solution produced by ...