I have a SIM808 module like this: https://www.banggood.com/SIM808-Module-GPS-GSM-GPRS-Quad-band-Development-Board-For-Arduino-p-1063106.html
The output header has 5 pins: GND/RX/GND/TX/VCC and I connected them as:
GND/VCC to a LiPo battery, 7.4V@1000mAh
RX->pin 14 (written on it TX3)
GND->to arduino GND
TX->pin 15 (written on it RX3)
and uploaded this code
#include <SoftwareSerial.h>
SoftwareSerial GSMSerial(15,14); // RX, TX
void setup()
{
GSMSerial.begin(19200);
Serial.begin(19200);
Serial.println("START");
}
void loop()
{
if(Serial.available())
GSMSerial.print((char)Serial.read());
else if(GSMSerial.available())
Serial.print((char)GSMSerial.read());
}
But I'm not getting anything on it (when sending "AT" or anything else).
Any help is appreciated.
Thank you!