The code includes two Arduino libraries: one for the servo and another for the ultrasonic sensors. The main code is a simple 14-line piece with a simple if-else statement you can readily modify.

The main components of the fridge buzzer consist of an MSP430G2232 low-power MCU connected to a SI7201 hall sensor switch, along with a CR2032 battery holder, push button and buzzer.

Each animation has a different Arduino code, but you won't need to modify it yourself, ... ultrasonic sensor, force-sensitive resistor (or push button), and piezo buzzer.

emergency push button ... Arduino, and ESP8266. [Gianni] leverages the aptly named Pushover (a paid app with a 1-week trial period) ... When you’re writing code for your next big creation, ...