A multi-zone central heating controller based on the ESP32.
It can be configured for an almost unlimited number of zones, pumps and separate boilers. Boiler run-on is supported, and configurable. Temperature sensing assumes DS18B20 sensors. One zone per valve, and it is assumed that zone valves trip microswitches when open.
Branches: no_master: Uses GPIO to read from the DS18B20 sensors
master: using a DS2482 1-wire master adaptor for longer cable runs. Using WebServer to handle http requests.
WiFiServer: Initial version using wiFi server and parsing incoming URLs byte-by-byte
The DS2482-100 is a I2C->1-Wire bridge (http://www.maximintegrated.com/datasheet/index.mvp/id/4382), contains functionality that means it is better at driving long and complex networks.
I used a DS2482-800 which additionally expands the bus to 8 separate channels, which allows for longer single-ended networks. For simplicity, using this break-out board. https://uk.rs-online.com/web/p/communication-wireless-development-tools/1360731/
Here is one of the programming screens
And here is one iteration of the hardware installed in a consumer unit case with Neutrik connectors for the pumps and valves and CB connectors for the temperature sensors:
