Datasheet

Pinouts

There's a lot packed into the FONA MiniGSM, lets go thru all the pins, buttons and indicators and what they do

Connectors

There's three external connectors along the left side, from the top, a mini JST 2-pin, a microUSB and a headphone

jack.

JST 2-pin - this is the battery input connector. It works with any of our Lipoly batteries but since the charge rate is

500mA (and the cellular module can spike high current draw!) we suggest our 500mAh (https://adafru.it/drL) or

1200mAh (http://adafru.it/258)batteries. You can also connect a JST cable here if you have other

plans. (http://adafru.it/261)

MicroUSB connector - this is the LiPoly/LiIon battery charging port. The SIM808 has a USB interface but its ONLY

for reprogramming the module with an expensive and unavailable IDE. So charge only! The charge rate is

500mA max.

Headset jack - this is a 'standard' TRRS 3.5mm phone headset jack with stereo earphone and mono

microphone. Any 'iPhone' or 'Android' compatible (but not iPhone original) should work. (https://adafru.it/fbK) We

tried about 10 different ones, and basically the more expensive once are more comfortable and louder but our

official iPhone headset mic did not work for unknown reasons. Sleeve is Mic+, first ring is ground, then the

second ring and tip are for stereo audio. The module does not have stereo out so we just tied both together.