Hardware Guide of Pool Controller
This Hardware Guide will describe how to setup the hardware of the controller.
Parts List (BOM)
- 1 * ESP8266 NodeMCU Controller ( Amazon)
- 2 * DS18B20 Temperature Sensors ( Amazon)
- 1 * Relais-Module 5V ( Amazon)
- 1 * Breadboard and wires to connect (alternativly soldering of the circuit)
Circuit
The circuit of the controller could be found on following image based on a breadboard wireing:
The source Fritzing file could be found in GitHub project: pool-controller.fzz
ESP8266 PIN Usage
The ESP8266 is connected using following PINs. You can find the constant values within the sources
of main.cpp (first column of table) which are associated to the pins.
| Constant in Source | PIN of ESP8266 | Description |
|---|---|---|
| PIN_DS_SOLAR | D5 | Pin of temperature sensor (DS18B20) for solar storage |
| PIN_DS_POOL | D6 | Pin of temperature sensor (DS18B20) for pool water |
| PIN_RELAY_POOL | D1 | Pin to connect relais for pool pump |
| PIN_RELAY_SOLAR | D2 | Pin to connect relais for solar pump |
TODO: improve PIN usage (see https://randomnerdtutorials.com/esp8266-pinout-reference-gpios/)
Power Supply
In my environment I use the USB to power the ESP8266 via small USB-Power-Adapter andan additional 230V power plug to be used as source for the power of the pumps which are switched via the relais.