When SIM808 “melts into” the Arduino, what wonderful things will happen? Look at our latest Elecrow SIMduino. This small board combines Arduino uno and sim808 module. It will save more cost and space for your project and easier to build other modules. It not only by DC power supply, we have designed a battery interface for it, you can also use a 3.7V lithium battery to power it. The SIM808 module can communicate with the Arduino via software serial port(PD7 and PD8) and hardware serial port(PD0 and PD1). Let's kick off Arduino projects with SIM808 GPRS/GPS module.