HomeKit Soil Moisture Sensor

About

This project creates a HomeKit-compatible accessory with a NodeMCU that measures soil moisture levels and sends the information to Apple's HomeKit app. Since HomeKit does not natively support a soil moisture sensor, the humidity sensor representation is used to display soil moisture levels.

Installation

1. If you haven't worked with an ESP8266 before, please follow the Installing ESP8266 Board in Arduino IDE guide.
2. Install the Arduino HomeKit ESP8266 library in the Arduino IDE.
3. Download this repository or copy its contents to your Sketch.
4. Update wifi_info.h to match with your Wi-Fi credentials.
5. Upload files to the NodeMCU.
6. Add the accessory to HomeKit App using the code 111-11-111 (edit my_accessory.c if you want to change)

Components

• NodeMCU (ESP8266)
• Soil Moisture Sensor
• USB Power Adapter
• Optionally: Breadboard power supply

Circuit Diagram

I didn't use the original breadboard power supply, and the NodeMCU is powered directly via a USB power adapter. You may add the breadboard power supply to the circuit without any adjustments to the scripts.

Moisture Levels Details

The soil moisture sensor outputs data ranging from 0 to 1024, where 0 represents maximum moisture and 1024 represents no moisture. This data is converted to a percentage scale from 0 to 100 to be compatible with HomeKit, where 0% indicates no moisture and 100% indicates maximum moisture.

Thanks

• Thanks to Mixiaoxiao for providing the HomeKit library that enables the integration of the NodeMCU with Apple HomeKit.

Original Project

• This project is a fork of the original HomeKit Soil Moisture Sensor project by shubhsheth.

Summary of Changes

• Refactoring the variable names for clarity and streamlined scripts.
• Detailed README and installation instructions
• Applied without the original breadboard power supply