Setup RPi hardware

Equipment

• RPi
• 3V3 relay, or 5V relay and TTL 3V3/5V converter
• three LED diodes (or one RGB LED) and min 220ohm resistors
• installed and correctly running ELV/EQ-3 MAX! Cube
• boiler with switched heat by wire, via relay
• credentials for mail server with TLS (or modify code)

Setup and install hardware

1. Verify your ELV/EQ-3 MAX! Cube is up and running, and get its IP address.
2. TBI in code, Wire 3 status LEDs and boiler relay as per sketch directory (circuit diagram or Fritzing sketch)
   • 220ohm resitor to pin11, then to code_run LED (in my setup green LED, lit when arduino script is reading messages from python part, this is sign of activity)
   • 220ohm resitor to pin13, then to error LED (in my setup red LED, lit when any error)
   • 220ohm resitor to pin15, then to status LED (in my setup blue LED, lit when heating is on)
   • relay GND to GND
   • LED diodes to GND
   • your DHW/Boiler to COM and NO (or NC) pins of relay (check your boiler documentation)
3. connect relay to pin 7, GPIO pin 4, see picture below

Pinout