I am thinking of running a basic soldering class, but all of the soldering kits I could find were either too basic (like 2 LEDs and a resistor), had terrible documentation, or were way too expensive. So, I decided to make my own!
This is a voltmeter that is capable of measuring from 0 to 100V DC, using a 328P running an Arduino sketch. The 328P will then display the voltage on the screen up top.
Before you say so, yes I know I could have chosen a cheaper/smaller MCU. However, I felt that this adds a bit of recycling opportunity; students, when done with their voltmeter, can now repurpose the parts to make a breadboard Arduino Uno for their next project.