Solar Station

Smart solar watering system
Written for Arduino IDE and PlatformIO.

If you like Solar Station, give it a star, or fork it and contribute!

Project is bootstrapped with my Arduino Bootstrapper library and my PlatformIO version increment script.

Credits

• Davide Perini

Components:

• Arduino C++ sketch running on an ESP8266EX D1 Mini from Lolin running at 80MHz or ESP32-S3
• Raspberry + Home Assistant for Web GUI, automations and MQTT server
• 88x142 5V solar panel
• Sony VCT6 18650 Lithium Battery
• TP4056 protected lithium charger
• MT3608 DC DC step up module to step up battery voltage @ 5.5V, ESP chip is happy with it
• MT3608 DC DC step up module to step up battery voltage @ 8.66V, water pump is powerful with it
• Relay Shield to safely power the water pump and "detach it from the circuit"
• (100kΩ + (22kΩ + 4.7kΩ)) voltage divider for Battery voltage level monitoring circuit (see Voltage divider section for ESP32-S3)
• 3.5V/9V water pump (3W @ 9V)
• TTP223 capacitive touch button with A contact soldered (HIGH signal when button is not pressed, LOW signal when button is pressed), used to reset the microcontroller
• Google Home Mini for Voice Recognition

Schematic

First working project

Final working project with two DC to DC step up modules

Voltage divider:

• Voltage source = 4.2V (lithium battery at max)
• R1 = 100kΩ
• R2 = 22kΩ + 4.7kΩ (in series)
• Voltage Out = 3.3V (maximum voltage that a D1 Mini can read from the analog pin)

EDIT: Project has been updated to work with an ESP32-S3. ESP32-S3 ADC pin reads up to 3.1V (with an attenuation of 11DB), for this reason I swapped the R2 resistors with a 22kΩ + 10kΩ + 4.7kΩ (in series).

From the top

Water pump

IP56 box

Second iteration of the same project for other plants in a non stacked format

Home Assistant Mobile Client Screenshots

License

This program is licensed under MIT License

Thanks To

Thanks	For
	For the CLion IDE licenses.