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).