Control system using external temperature sensor (DB18B20) with a configurable temperature treshold (SetTemp) controlling heatcable relay. LCD display (Omilex sheild-LCD16x2) to visualize external(OutTemp) and treshold(SetTemp) with relay status. Pushbutton to increase or decrease the temperature treshold.
Two versions available Basic without any WiFi connection and one using WiFi and MQTT topics to publish status.
Needed Arduino Libraries to be included in IDE. Install them either from GitHub repository directly or within the IDE application itself Sketch > Import Library
| Library | Link to GitHub | Basic | MQTT |
|---|---|---|---|
| PubSubClient | https://github.com/knolleary/pubsubclient | X | |
| OneWire | X | X | |
| Dallas Temperature | X | X | |
| Wire | X | X | |
| LCD16x2 | https://www.olimex.com/Products/Duino/Shields/SHIELD-LCD16x2/open-source-hardware | X | X |
| Dallas Temperature | X | X |
MQTT Topics to be published.
| Topic | Description |
|---|---|
| HeatCable/Status | set topic - Status "online/offline" |
| HeatCable/RelayStatus | set topic - Relay status "activated/deactivated" |
| HeatCable/OutTemp | set topic - Outdoor temperature |
| HeatCable/SetTemp | set topic - Configured temperature |
| Part | Comment/Link |
|---|---|
| Wemos D1 mini | https://www.wemos.cc/en/latest/ |
| Omilex sheild-LCD16x2 | https://www.olimex.com/Products/Duino/Shields/SHIELD-LCD16x2/open-source-hardware |
| Tempsensor DB18B20 | |
| Power Supply HLK-PM03 | http://www.hlktech.net/product_detail.php?ProId=59 |