ESP32 Forum

Hi
Im using a GSM module, using :
#include <HardwareSerial.h>
HardwareSerial SIM800L(1);

setup:
Serial.begin(19200);
SIM800L.begin(9600, SERIAL_8N1, 16, 17);

While I used esp32 connectet to my PC works fine, if I disconnect the pc USB cable it loose GSM module connectivity.

Please help.

check stability of your power supply for SIM800L, it need also up to 2A.

Probably is not a issue with ESP32, it is a issue with power supply.

Hi thanks, yes was not ESP problem, was low power input to the GSM module.

Problem solved