SIM800L ESP32 module and Battery power

All ESP32 boards running MicroPython.
Target audience: MicroPython users with an ESP32 board.
Post Reply
jadro
Posts: 25
Joined: Wed Apr 29, 2020 7:02 pm

SIM800L ESP32 module and Battery power

Post by jadro » Sun Jun 06, 2021 10:45 am

Hi,

I have SIM800L module with ESP32 all in one board.
It works, I use it for SMS send/receive and for CALL incomming/outgoing and it works as a charm.
It has line in for battery power and when USB power looses the power it works only on battery but there is a problem in SMSing and CALLing when on battery. When power on USB goes ON again it starts working great.
I think maybe problem is in UART configuration.
I have this config self.uart = UART(1, 9600, timeout=1000, rx=self.MODEM_TX_PIN, tx=self.MODEM_RX_PIN).
Is this same when on battery? or have to be UARTNO some other maybe 0? Or I need to reconnect battery wires on USB powering wires?

Post Reply