HAPInode
The hardware for the HAPInode is based on arduino. Since the main focus of HAPI is a system wide automation, arduinos that can easily incorporate WiFi and Bluetooth Low Energy are preferred. Conditional defines in the arduino software allow for ESP32, ESP8266 and mega2560 w/Ethernet modules. The preferred development module is (https://learn.sparkfun.com/tutorials/esp32-thing-hookup-guide), which includes the necessary WiFi, Bluetooth, external power and external battery interfaces.
