Meet the MudWatt STEM Kit: an educational product that lets you build your own living fuel cell with microbes in the mud. The blinker circuit and mobile app help you track the growth of your bacteria. You can experiment with different types of dirt to see what works best.
This particular kit comes with 2 carbon felt electrodes, gloves, LED blinker board, instructions, and an app. It is expected to be compatible with iOS and Android devices.[where to get it]