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 ...

Build your own DIY Boat-Bot — a floating robot that sails across water using a small motor and battery! 🚤🤖 This fun and easy science project is perfect for kids, school exhibitions, or STEM learning ...