How to Use Gravity Analog pH Sensor Meter Kit V2 SKU SEN0161-V2: Examples, Pinouts, and Specs

The Gravity Analog pH Sensor Meter Kit V2, manufactured by DFRobot, is a high-precision sensor designed to measure the pH level of liquids. It provides an analog voltage output that corresponds to the acidity or alkalinity of the solution being tested. This sensor is ideal for applications such as aquaculture, hydroponics, environmental monitoring, and laboratory experiments. Its compact design and ease of use make it suitable for both beginners and professionals.

Key features of the sensor include:

• High accuracy and stability for pH measurements.
• Simple analog output for easy integration with microcontrollers.
• Compatible with Arduino and other development platforms.
• Durable and waterproof pH probe for long-term use.

Below are the key technical details of the Gravity Analog pH Sensor Meter Kit V2:

The sensor module has a 3-pin interface for connecting to a microcontroller. The pin configuration is as follows:

1. Power Supply: Connect the VCC pin to the 5V (or 3.3V) pin of your microcontroller and the GND pin to the ground.
2. Analog Signal: Connect the AOUT pin to an analog input pin on your microcontroller (e.g., A0 on an Arduino UNO).
3. pH Probe: Attach the pH probe to the BNC connector on the sensor module. Ensure the probe is securely connected.

1. Prepare Calibration Solutions: Use standard pH buffer solutions (e.g., pH 4.0, pH 7.0, and pH 10.0).
2. Set Calibration Mode: Adjust the potentiometer on the module to calibrate the sensor. Follow these steps:
   • Immerse the probe in the pH 7.0 buffer solution and adjust the potentiometer until the output voltage corresponds to the expected value.
   • Repeat the process with pH 4.0 and pH 10.0 solutions for multi-point calibration.

Below is an example of how to use the Gravity Analog pH Sensor Meter Kit V2 with an Arduino UNO:

// Include necessary libraries
// No additional libraries are required for basic analog reading

#define PH_PIN A0  // Define the analog pin connected to the sensor
float voltage;     // Variable to store the sensor's output voltage
float pHValue;     // Variable to store the calculated pH value

void setup() {
  Serial.begin(9600);  // Initialize serial communication
  pinMode(PH_PIN, INPUT);  // Set the pH sensor pin as input
}

void loop() {
  // Read the analog value from the sensor
  int sensorValue = analogRead(PH_PIN);

  // Convert the analog value to voltage (assuming 5V reference)
  voltage = sensorValue * (5.0 / 1023.0);

  // Convert the voltage to pH value using the sensor's formula
  // The formula may vary based on calibration; adjust as needed
  pHValue = 3.5 * voltage;  // Example conversion factor

  // Print the pH value to the Serial Monitor
  Serial.print("pH Value: ");
  Serial.println(pHValue);

  delay(1000);  // Wait for 1 second before the next reading
}

• Always rinse the pH probe with distilled water before and after use to prevent contamination.
• Store the pH probe in a storage solution when not in use to maintain accuracy and prolong its lifespan.
• Avoid exposing the probe to extreme temperatures or corrosive chemicals.

1. Inaccurate Readings:

   • Ensure the sensor is properly calibrated using standard pH buffer solutions.
   • Check for contamination or damage to the pH probe.

2. No Output Signal:

   • Verify the connections between the sensor and the microcontroller.
   • Ensure the power supply voltage is within the specified range (3.3V - 5.5V).

3. Slow Response Time:

   • Clean the pH probe with a soft brush and distilled water to remove any residue.
   • Replace the probe if it is old or damaged.

Q: Can this sensor be used for continuous monitoring?
A: Yes, the sensor is suitable for continuous monitoring, but the pH probe should be properly maintained and stored when not in use.

Q: How often should I calibrate the sensor?
A: Calibration frequency depends on usage. For critical applications, calibrate before each use. For general use, calibrate weekly or monthly.

Q: Can I use this sensor with a 3.3V microcontroller?
A: Yes, the sensor is compatible with both 3.3V and 5V systems.

Q: What is the lifespan of the pH probe?
A: The probe typically lasts 1-2 years with proper care and maintenance.

By following this documentation, you can effectively use the Gravity Analog pH Sensor Meter Kit V2 for accurate and reliable pH measurements in your projects.