Available entities include vehicle status (on/off), lights status (on/off), direct relay control, and main battery voltage
RGB Status LED, ESP32 DevKit v1, 12V switching regulator (for radio and lights when increasing main battery voltage), 3.3V switching regulator, Micro K relay, dual optoisolated inputs for vehicle power and lights
Main battery input, ~13.5V DC output, 3.3V DC output, relay connections, vehicle power and light status input