![]() This is basically the ‘interrupt-out’ pin from the module. TxD (Transmitter) pin transmits data from the module to the microcontroller. This pin is auto-baud so the baud rate at which you send the “AT” command after reset is the baud rate used. RxD (Receiver) pin is used to send commands to the module. If you got the module in an absolutely bad space, pull this pin LOW for 100ms to perform a hard reset. It doesn’t even run on 3.3 V! Use a Li-Po battery or a DC-DC buck converter instead. Keep in mind that the SIM800L chip has an operating voltage range of 3.4 V to 4.4 V, so connecting this module to the Arduino’s 5V output is probably going to cause damage to the module. ![]() NET pin is where you can solder the helical antenna that comes with the module. ![]()
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