hideGrow Sensor Hub

ESP32-based environmental monitoring system with HomeKit integration for pH, temperature, and CO2 measurements.

Hardware Requirements

• ESP32 development board
• ADS1115 16-bit ADC
• SEN0161 pH sensor (analog output)
• DS18B20 temperature sensor (analog output)
• MH-Z19B CO2 sensor (UART interface)

Dependencies

• HomeSpan library
• Wire library (built-in)
• Adafruit_ADS1X15 library
• MH-Z19 library (version 1.5.4 or higher)
• PlatformIO for development

Pin Configuration

Component	Pin/Interface
ADS1115	I2C (SDA: GPIO21, SCL: GPIO22)
pH Sensor	ADS1115 A0
Temperature Sensor	ADS1115 A1
CO2 Sensor	UART (RX: GPIO16, TX: GPIO17)

Features

• High precision 16-bit ADC readings using ADS1115
• Real-time pH monitoring (0-14 range)
• Temperature monitoring (-50°C to 100°C)
• CO2 monitoring (400-5000ppm)
• HomeKit integration
• Automatic value updates every 5 seconds

HomeKit Integration

The device appears as three sensors:

1. pH Sensor (shown as Light Sensor, range 0-14)
2. Temperature Sensor (range -50°C to 100°C)
3. CO2 Sensor (range 400-5000ppm)

License

MIT License - See LICENSE file for details