We get some feedbacks of IComsat, many clients complain that it can not be power on by software but need to press the “Power” button. In this new version, we upgrade this software power on function with IComsat now. Not only can use the button for power on , but also can use the digital pin of Arduino to power on (D9) and reset (D10) the SIM900 module.
In order to facilitate the development of voice, we add two 3.5mm jack socket on board for MIC and Headset.
The new version retain the UART/Debug switch, so it will offer you the possibility to update your firmware to SIM900 or debug the SIM900 by Debug port. You can get more information about this switch in the IComsat datasheet.
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