Arduino is a wonderful platform to rely on to learn electronics and prototype. With AAduino, you can experiment with wireless projects. This is a wireless Arduino clone the size of an AA battery. It is powered by an ATMega328p and has DS18B20 temperature sensors and an indicator LED.
More gadgets like this: here
As you can tell from the images, AAduino is designed to go inside a 3 x AA battery holder. More information is available on GitHub.
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