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Tiny ESP32-C3 development board has USB support for serial communication, but it's not work in Platformio without by default. Here is simple solution to fix ESP32-C3 with Platformio.

Let's take a look at the simple example of using interrupt from hardware timer to generate signal at the one of the GPIO pin.

Fixing incorrect predefined XTAL (onboard crystal) frequency, that cause incorrect frequency of output PWM signal and rubbish charactersin debug terminal.

Let's find out the ESP32 internal pull-up/pull-down resistance by measuring of the real resistance of the using ampermeter.

Assembling Android oscilloscope based on STM32F401/STM32F411 microcontroller with additional WiFi SoC ESP32 module, that give a chance to get wireless Wi-Fi connection and remotely monitoring signals.