In this case, all GSM modules will be powered through GSMPWR connector. Take into account that you don't need to connect this power connector if you closes the JP1 jumper. GSMPWR2: GSM modules power: connect, from left to right: Any alternative 5V poser supply (can be ATX Yellow (12V) through a 5V DC-DC step down, ATX Black (GND).GSMPWR: GSM modules power: connect, from left to right: ATX Red (5V), ATX Black (GND).LPWR: Logic power: connect, from left to right: ATX Purple (5V SB), ATX Black (GND).ATXE: ATX enable signal, connect, from left to right: ATX Black (GND), ATX Green (Enable).RSW: reset switch, connect the ATX reset switch.PSW: power switch, connect the ATX power switch.Board designed using Eagle Cad, sources under hardware folder. The device is based on an Arduino PRO mini, running at 16 MHz and 5V. This repo contains source code and hardware specifications for building a 8 SIMs communications device to monitor SMS reception on up to 8 mobile lines.
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