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pH Sensor Calibration and Reading

This project involves reading and calibrating pH values from a pH sensor connected to an Arduino board. The sensor's analog readings are processed to determine the pH level of the solution being tested, with results displayed on the Serial Monitor.

  • Arduino Board
  • pH Sensor
  • Jumper Wires
  • Breadboard (optional)

Block Diagram

pH Sensor:

Signal Pin (S): Connect to analog pin A1 on the Arduino

Power Pin (V+ or VCC): Connect to the Arduino's 5V pin

Ground Pin (GND): Connect to the Arduino's GND pin

Instructions

1.Set Up the Circuit:

Connect the pH sensor to the Arduino board as per the pin connections mentioned above.

Ensure all connections are secure and properly grounded.

2.Initialize Serial Communication:

Begin serial communication at a baud rate of 9600 to enable data transmission between the Arduino and a connected device (e.g., computer).

3.Read and Process pH Sensor Data:

In the loop() function, read the analog voltage value from the pH sensor connected to the specified analog pin (A1).

Store the sensor readings in an array and sort the array to filter out noise and get a stable reading.

Calculate the average of the middle values from the sorted array to ensure a more accurate pH reading.

4.Calibrate and Display pH Values:

Convert the averaged sensor value to a voltage.

Apply a calibration formula to convert the voltage to a pH value using a predetermined calibration value.

Print the calibrated pH value to the Serial Monitor.

5.Delay and Repeat:

Use the delay() function to introduce a short delay between sensor readings, ensuring stability and preventing data flooding in the Serial Monitor.

Applications

Water Quality Monitoring: Use the setup to monitor and measure the pH levels of various water samples, essential for environmental and agricultural applications.

Chemical Experiments: Integrate the pH sensor in laboratory experiments to measure the acidity or alkalinity of different solutions.

Educational Projects: Demonstrate the principles of pH measurement and sensor calibration in educational settings using this simple yet effective project.