This code is for testing / using capacitive soil moisture sensors with ESP based boards (ESP32 / ESP8266) in Arduino IDE. It provides functions for getting calibration values and displays the information via 20x4 LCD and if enabled via serial monitor.
- You need to gather calibration data first to measure soil
- Needs to be calibrated for every sensor / ESP combination (ESP8266 has different ADC values than ESP32)
- Probably also needs to be calibrated for different power sources
| Use | Function name |
|---|---|
Measure dry calibration value (sensor in air) -> modify airVal to this value |
measureAir(); |
Measure wet calibration value (sensor in water) -> modify waterVal to this value |
measureWater(); |
| Measure soil moisture based on calibration values gathered with the above functions | measureSoil(); |
| Get raw values for debugging purposes | rawVals(); |
- ESP8266 (NodeMCU V3)
- Capacitive soil moisture sensor v1.2
- 20x4 2004A blue LCD (HD44780) with I2C adapter module
| ESP8266 | Sensor |
|---|---|
| 3,3V | VCC |
| GND | GND |
| AD0 | AOUT |
| ESP8266 | LCD |
| 5V | VCC |
| GND | GND |
| D2 | SDA |
| D1 | SCL |
The following library is needed to be able to use this code:
| Library | URL |
|---|---|
| LCD_I2C | https://gitlab.com/tandembyte/LCD_I2C |
The ESP capacitive soil moisture sensor project by Dominik Künne is licensed under CC BY-NC 4.0. To view a copy of this license, visit https://creativecommons.org/licenses/by-nc/4.0
This project uses code from:
- how2electronics.com: Example code for sensor and LCD (https://how2electronics.com/interface-capacitive-soil-moisture-sensor-arduino/)
- tandembyte/LCD_I2C: Library (https://gitlab.com/tandembyte/LCD_I2C/-/tree/master)
Please see the LICENSE file for details.
- WLAN connection
- MQTT
- Offline calibration via buttons
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