|Modules & Embedded Solutions
1. There is a switch on the expansion board to select SIM900 serial port or SIM900 debug port connection. If you select Debug port, you must use Arduino hardware serial port to control, the analog serial port is invalid. A Farah capacitor is provided on the board to power the RTC of the module. 2. Debug toggle switch, you can connect the DE900 port of SIM900 to Arduino or connect to PC via ATMEGA8U2/FT232 on Arduino for debug debugging. 3. 3.3V and 5V automatic level compatible, can adapt to 3.3V or 5V main control board, support other platform development boards such as leaf maple and Chipkit 3.3V If you need to download the data, please contact us.