PS: Do you have maybe a source solving my other problem: My ESP32 (exactla: LILYGO® TTGO T-Call V1.4 ESP32 Wireless Module SIM Antenna SIM Card SIM800L) doesn't start after power on. It is powered by a potent power unit with 3,7 V at the backside small power jack. After power on is no reaction. I ha...

Yes, it was very helpful!
I did it try yesterday and it works immediately!
Thank you very much for your help!
regards
aabbcc

Thank you, that was a very helpful link! However, it doesn't work. I did include driver/adc.h, but after the configuration of the port with adc1_config_width(ADC_WIDTH_BIT_12); adc1_config_channel_atten(ADC1_CHANNEL_0,ADC_ATTEN_DB_11); do I get the failure message: expected constructor, destructor, ...

Hello,
I intend to use any port for meassuring of voltage.
But in the pin diagram do the ports have 2 or 3 descriptions (port 12: touch- ADC 15 - GPIO15).
How have I to define that port 12 should be analog input?
Is there a description how to do so?
Thanks
regards
aabbcc

Nevertheless, I will check with the recommanded capacitor!
regards
aabbcc

Hello, thank you for your fast answer! The source of power is very potent (2 x 1000mikroF) and it is able to start the board after pressing RST. At the start of the program isn't needed to much power, because the SIM800L is during start phase out of order. It comes later. I should know, where the GP...

Hello, it is needed to start the program immediately after power-on (over 3V3-pin) W H I T O U T pressing RST. But it doesn't, I have to press RST. I red, it should for a immediately start connected be GPIO-0 andGPIO-2 together over 10k to 3V3 and GPIO-15 over 10k to GND. And there is the problem: I...