In this project, my friend and I assembled a "virtual pen" with Arduino 33 BLE Sense that determines which digit the user is writing based on the motion they make holding the pen, without the use of a camera.
This article serves as an introduction to ultrasonic sensors and explains how you can get them up and running in no time using an ESP8266 development board.
In this project, we train a Machine Learning model on a Raspberry Pi to identify whether an object goes in the garbage, recycling, compost, or hazardous waste