Hardware
General notes on pins
The pins shown in the diagrams and tables are examples based on current configurations. Each installation may vary depending on the board model used (ESP32-S3, ESP32-C6, ESP32-C3, mini or standard format). Pins should be adapted to your own hardware and needs.
The manifold
Compatible microcontrollers
| Chip |
Note |
| ESP32-C6 |
Currently used, supports WiFi + ESP-NOW |
| ESP32-S3 |
Valid alternative, more computing power |
| ESP32-C3 |
Compatible, fewer resources but sufficient |
Components and functions
| Component |
Quantity |
Function |
| Microcontroller |
1 |
ESP32-C6/S3/C3 with WiFi + ESP-NOW |
| Relays |
4+ |
Zone valve control |
| Relay |
1 |
Circulator control |
| Optoisolators |
4+ |
Valve feedback |
| LED |
1 |
Status signaling |
Operating logic
| Function |
Description |
| Command reception |
Receives commands from thermostats via ESP-NOW or WiFi |
| Confirmations |
Sends confirmations to thermostats |
| Alarms |
Sends alarms in case of anomalies |
| Circulator management |
Customizable timing logic |
| Safety timeout |
Evaluates shutdown after a preset time |
| Consistency check |
Perpetual verification between requested and actual state |
| Feedback |
Reading optoisolators to verify valve status |
The thermostats
Compatible microcontrollers
| Chip |
Note |
| ESP32-S3 |
Recommended for models with display (e.g. Zero mini format) |
| ESP32-C6 |
For models without display or with basic functionality |
| ESP32-C3 |
For compact models or repeaters |
Models and installations
| Model |
Installation |
Specific function |
| Mobile |
Electrical outlet |
Plug-and-play, standard solution |
| Internal 503 |
Inside 503 box |
Local user interface |
| Side 503 |
Side-mounted on 503 box |
Compact module, essential controls |
| Repeater |
Side or inside 503 |
ESP-NOW network extension |
| Panel |
Side or inside 503 |
Centralized control, full menu |
Common features
| Component |
Function |
| Microcontroller |
Processing and communication (S3, C6 or C3) |
| Sensor |
Temperature and humidity sensing |
| LED |
Status signaling |
| Communication |
WiFi + ESP-NOW (primary and fallback) |
3D printed mobile thermostat case
The mobile thermostat case is available for 3D printing.