It looks like IO0 is not connected on the ESP32 module.

For instance, with 3v at the top of the voltage divider the center measures 1.5v when not connected to gpio1, it measures 1.2v when connected to gpio1 and 1.5v when connected to gpio2. With 4v at the top of the divider, I measure 2v when unconnected and 1.5v when connected to gpio1. Is seems that th...

Hi, Using an esp32c6 and esp-idf version 5.1.1 I've set up a voltage divider with two 100k resistors to measure battery voltage. When I use adc1ch1 (gpio1) it pulls the voltage of the divider down throwing the measurement off. If I use adc1ch2 (gpio2) it does not. Is this something that can be disab...

That should work but how do you plan on flashing the module? I generally bring these plus GND and RXD/TXD to a connector (even if unpopulated) so that in a pinch the board can be re-flashed.

Espressif does not control additions to platformIO. You need to contact them to see if they are willing to add it. Does that mean I can't use PlatformIO to write programs for a board that I design? That doesn't sound right. I was thinking that I would need to make some new description file that wou...

While updating from esp-idf 4.3.x to 4.4.1 I noticed that mcpwm_capture_enable() was deprecated in favor of mcpwm_capture_enable_channel(). So in mcpwm_capture_config_t I set cap_prescale the same as I had previously passed to mcpwm_capture_enable() in num_of_pulse. This resulted in a different moto...

While this may be too late to help you I used highint 5 to sync a DS3231 RTC with I gps module. It uses highint 5 to detect the active edges of both the GPS and the RTC and computes the delta in microseconds. Code can be found here https://github.com/liebman/esp32-gps-ntp

Maybe something happens with the DTR & RTS signals at disconnection?

Maybe use xt_highint4 or xt_highint5? You'll have to write it in assembler but its very low latency. (and the latency is more consistent) https://docs.espressif.com/projects/esp-idf/en/v4.4/esp32/api-guides/hlinterrupts.html. I've used it to measure the time offset of two signals to sync a DS3231 wi...

This works for me, I've used this pattern many times: (this is a 1hz signal from a DS3231 RTC, ignore the "timer" bits, I use that on a test board that does not have the RTC installed) /* * MIT License * * Copyright (c) 2022 Christopher B. Liebman * * Permission is hereby granted, free of charge, to...