4 in 1 pH Sensor Module – pH, Light, Temperature & Water Level TTL for Arduino & Raspberry Pi

The 4 in 1 pH Sensor Module – pH, Light, Temperature & Water Level TTL is a multi-functional sensing module designed for monitoring pH level, water level, light intensity, and temperature in various applications. This compact PCB-based module integrates multiple sensing functionalities into a single board, making it ideal for agriculture, industrial monitoring, hydroponics, aquaponics, smart farming, and water analysis systems.

PH sensors measure the level of pH in sample solutions by detecting the activity of hydrogen ions present in the liquid. This activity is compared with pure water (neutral solution) using the pH scale ranging from 0 to 14 to determine the acidity or alkalinity of the sample solution.

• pH value of pure water is 7 (Neutral)
• pH value decreases when acidity increases
• pH value increases when alkalinity/base increases

Additionally, this module also includes:

• Light Intensity Sensor (LDR)
• Temperature Sensor
• Water Level Sensor

The module can simultaneously measure water level, temperature, light intensity, and pH value, making it highly suitable for embedded systems, automation, and IoT-based environmental monitoring projects.

Features

• 4 in 1 Multi Sensor Module
• Measure the pH Level
• Measure the Light Intensity
• Measure the Water Level
• Measure the Temperature
• Integrated PCB sensor design
• Compact and easy-to-interface module
• Suitable for embedded and automation projects
• UART TTL communication support
• Stable operation at 9600 baud rate
• Ideal for hydroponics and smart farming systems

Technical Specifications

Pin Configuration

Connection Diagram Details

1. D7 – Temperature Sensor
2. D6 – Light Sensor
3. D5 – PH Sensor
4. 5V – Power Supply
5. GND – Ground Pin

Connection Steps

1. Connect 5V supply to the PH module
2. Connect the Ground pin properly
3. Connect TX of PH sensor to RX of TTL
4. Connect RX of PH sensor to TX of TTL
5. Read sensor outputs from the following pins:
   • D5 gives PH sensor output
   • D6 gives Light sensor output
   • D7 gives Temperature sensor output

Note: This module works at 9600 baud rate

Applications

• Agriculture Monitoring Systems
• Industrial Temperature Monitoring
• Water PH Level Monitoring
• Light Intensity Control
• Low Ionic and Ultra Pure Water Analysis
• Hydroponics Systems
• Aquaponics Systems
• Smart Farming Projects
• IoT Environmental Monitoring
• Embedded Sensor Projects
• Water Quality Monitoring Systems
• Greenhouse Automation
• DIY Electronics and Sensor Projects

Package Includes

• 1 x 4 in 1 pH Sensor Module – pH, Light, Temperature & Water Level TTL