Hey People,
I recently bought a SIM800c Model with integrated level shifter (as far as I know), see attachment.
I can start it up but I can establish no Serial connection (I don't get an answer when i send 'AT', NR and CR are enabled in the serial monitor).
Pins are connected as follows:
SIM800 5v -> 5v/3a Power supply
SIM800 V_TLL -> 5v Arduino
SIM800 GND -> GND Arduino & GND Power supply
SIM800 TX -> Pin 19 (RX1) Arduino
SIM800 RY -> Pin 18 (TX1) Arduino
There is a german e-plus simcard with simlock disabled inserted.
My code:
void setup()
{
Serial.begin(9600);
Serial1.begin(9600);
delay(1000);
Serial.println("Testing GSM SIM800L");
}
void loop()
{
if(Serial1.available())
{
Serial.write(Serial1.read());
}
if(Serial.available())
{
Serial1.write(Serial.read());
}
}
I am out of ideas and searching the forums and the rest of the internet didn't give me any concrete answers, as to what is going wrong.
I would really apprechiate some help!