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

The 4 in 1 pH Sensor Module is a compact and cost-effective multi-sensor board designed to measure pH value, light intensity, temperature, and water level simultaneously. This all-in-one module reduces wiring complexity and is ideal for IoT, smart farming, hydroponics, and environmental monitoring projects.

The module communicates using TTL UART (9600 baud) and is fully compatible with Arduino, Raspberry Pi, ESP32, STM32, and other microcontroller platforms. With proper calibration, it delivers stable and reliable readings according to your measurement scale.

Thanks to its compact PCB design and digital TTL outputs, this sensor module is perfect for real-time monitoring applications where multiple environmental parameters need to be tracked efficiently.

Key Features

• pH Measurement (0–14): Detects acidity or alkalinity of liquids

• Light Sensor (LDR): Measures ambient light intensity

• Temperature Sensor (NTC): Monitors environmental temperature

• Water Level Sensor: Detects water presence or level

• TTL Digital Interface: Serial communication via TX/RX at 9600 baud

• Wide Compatibility: Works with Arduino, Raspberry Pi, ESP32, AVR, STM32

• Compact Design: Multiple sensors integrated on a single PCB

Technical Specifications

• Exact Product Name: 4 in 1 pH Sensor Module

• Sensors Included:

  • pH Sensor

  • LDR Light Sensor

  • Temperature Sensor (NTC)

  • Water Level Sensor

• Operating Voltage: 3.3V – 5V DC

• Output Type: TTL Digital Signals

• Interface: TTL UART

• Baud Rate: 9600

• Form Factor: Compact PCB with through-hole mounting

Pin Configuration

• 5V – Power Supply

• GND – Ground

• TX – Connect to RX of controller

• RX – Connect to TX of controller

• D5 – pH Sensor Output

• D6 – Light Sensor (LDR) Output

• D7 – Temperature Sensor Output

Applications

• Smart Farming & Precision Agriculture

• Hydroponics & Aquaponics Systems

• Water Quality Monitoring

• Environmental & Industrial Monitoring

• IoT Automation Projects

• Educational & Research Projects