Home Assistant info
ESPHome YAML code real life Examples - controllers based on ESP32 / ESP8266
Distance sensor esphome code example HC-SR04 ultrasonic - link to wiring diagram
DC power monitor based on PZEM - DC esphome.io/components/sensor/pzemdc.html
ESP8266 with Relaisboard ESPHome example code (avoiding the turn on switch glitch)
Here are some links to interesting pinout and hardware diagrams