Lilygo t-call sim800L - Unable to start modem!

ESPHome
1

Hey everyone,
I tried to use a Lilygo t-call sim800L to send SMS to myself (for now), but I cant get the modem initialized. Can it be a power problem (It is plugged to my PC USB port), and if yes, how can I get the needed power while still plugged to the PC ?

2

Are you still working on this? I think I have the solution to get the modem on but I am struggling getting further along getting it working still.

3

how did you get it to work???

4

Sorry only just seen your reply. If you delve into the code theres a start up sequence you have to do. Basically turning pins on and then you turn one off and back on again to initialise the modem, I have since come away from this idea completely.

5

Maybe this will help someone initialize T-Call V1.3 (20190610). It works for me.

  includes:
    - <Wire.h>
  on_boot:
    - priority: 800 #This is where all hardware initialization of vital components is executed. For example setting switches to their initial state.
      then:
        lambda: |-
                Wire.begin(21, 22);
                Wire.beginTransmission(0x75);
                Wire.write(0x00);
                Wire.write(0x37);
                Wire.endTransmission();
                pinMode(5, OUTPUT);
                digitalWrite(5, HIGH);
                pinMode(4, OUTPUT);
                pinMode(23, OUTPUT);
                digitalWrite(23, HIGH);
                digitalWrite(4, HIGH);
                delay(100);
                digitalWrite(4, LOW);
                delay(1000);
                digitalWrite(4, HIGH);
                pinMode(13, OUTPUT);
                digitalWrite(13, LOW);