With this project you can measure a frequency from less than 1 Hz to about 6.4 MHz, with atomic clock accuracy (fclk_I_O / 2.5 according to the datasheet, which is 16 MHz / 2.5 = 6.4 MHz, but 7.5 MHz ...

The Geiger counter module provides a pulse to GPIO27 which triggers an interrupt to increase the internal counter. We are using the esp32 touch sensor routine on GPIO12 to determine if a user wants to ...