TLDR: The Internet of Things & ESP32 Arduino Beginners Course Bundle explains some of the best 2021 tools for creating cool web-connected smart devices all by yourself. Learners never stop ...

An Arduino can be used to test the life of any battery with less than 5 volts, Boxall says. So, for a quick way to see how much juice your AAA, AA, C, or D batteries have left, build this Arduino ...