I have connected the SIM800L module to an Arduino board and I am able to communicate with it through Serial. The module responds correctly to all commands but seems to have issues detecting SIM cards.
SEND: ATI ATI SIM800 R13.08 OK SEND: AT+CMEE=2 AT+CMEE=2 OK SEND: AT+CPIN? AT+CPIN? +CME ERROR: SIM not inserted
- Voltage: 4.1V
- Max amperage: 2A
- VCC to power supply
- GND to power supply
- GND to Arduino board
- Rx/Tx to Arduino board
In this case I am using a Heltec LoRa 32 V2 which uses 3.3v for GPIO.
- Re-solder SIM card holder pins
- Different SIM cards (all 2G compatible)
- Different SIM800L modules (tried 2)
If there’s any more information I can provide that may help find a solution please notify me.