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Re: UART with GSM SIM800L

Posted: Tue Feb 18, 2020 3:26 pm
by headshaker
sarusso wrote:
Thu Feb 13, 2020 3:02 pm
To anyone still interested in using the SIM800L from MicroPython, here is a pure-MicroPython driver ready to use. You can use it as-is or just see how to do things in the right way. Happy coding! :)

https://github.com/pythings/Drivers/blo ... SIM800L.py
Could you please give the wiring you use? I'm trying to make it with a board like this but with no luck:

Image

Re: UART with GSM SIM800L

Posted: Tue Feb 18, 2020 3:57 pm
by sarusso
Provided that I am not an hardware expert, there is the wiring schematic on the GitHub page of the board I am using: https://github.com/Xinyuan-LilyGO/TTGO-T-Call (I attach a screenshot just in case).

When I started working on SIM800L wiring a few weeks ago, I noticed a lot of confusion online in respect to TX and RX - keep in mind that RX for the SIM800L it TX for the esp32 and vice-versa. I was doing that wrong in the beginning.
T-Call pinout from GitHub.jpg
T-Call pinout from GitHub.jpg (207.86 KiB) Viewed 1206 times

Re: UART with GSM SIM800L

Posted: Sat Feb 22, 2020 1:09 pm
by headshaker
Thanks!

I've managed how to do it:

SIM800L EVB 5V - to external 5V 2A power source +
SIM800L EVB GND - to external 5V 2A power source -
SIM800L EVB VDD - to ESP32 3.3V + Pin
SIM800L EVB TXD - to ESP32 RX Pin
SIM800L EVB RXD - to ESP32 TX Pin
SIM800L EVB GND - to ESP32 GND Pin
SIM800L EVB RST - to ESP32 23 Pin (any pin, we use it for power on/of SIM800L)

Now the only problem is in PPPoS

Re: UART with GSM SIM800L

Posted: Wed Feb 26, 2020 1:46 pm
by sarusso
headshaker wrote:
Sat Feb 22, 2020 1:09 pm
Now the only problem is in PPPoS
There is this PR from the hiveeyes.org community:

https://github.com/pythings/Drivers/pull/5

..but I have not gave it a try yet.

Re: UART with GSM SIM800L

Posted: Sat Apr 11, 2020 11:41 am
by Jonwalter
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