How to Use Voltage Sensor DC 25V: Examples, Pinouts, and Specs

The Voltage Sensor DC 25V is a compact and efficient device designed to measure the voltage level in a DC circuit, with a maximum input voltage of 25 volts. It provides real-time feedback, making it an essential tool for monitoring and control applications. This sensor is widely used in battery monitoring systems, power supply diagnostics, and embedded systems where voltage measurement is critical.

• Battery voltage monitoring in renewable energy systems
• Power supply diagnostics in electronic circuits
• Voltage measurement in robotics and IoT projects
• Integration with microcontrollers like Arduino and Raspberry Pi for real-time data logging

The Voltage Sensor DC 25V is designed for ease of use and compatibility with a wide range of systems. Below are its key technical details:

The Voltage Sensor DC 25V typically has a 3-pin interface. Below is the pinout description:

The Voltage Sensor DC 25V is straightforward to use in a circuit. Follow the steps below to integrate it into your project:

1. Power the Sensor: Connect the VCC pin to a 3.3V or 5V DC power source, depending on your system's requirements.
2. Ground Connection: Connect the GND pin to the ground of your circuit.
3. Voltage Input: Connect the positive terminal of the voltage source to be measured to the sensor's input terminal.
4. Output Signal: The OUT pin provides a scaled voltage output (0-5V DC) proportional to the input voltage.

• Voltage Divider Ratio: The sensor uses a 5:1 voltage divider. For example, an input voltage of 25V will produce an output of 5V.
• Input Voltage Limit: Do not exceed the maximum input voltage of 25V, as this may damage the sensor.
• Calibration: For precise measurements, calibrate the sensor using a multimeter to account for any minor inaccuracies.

The Voltage Sensor DC 25V can be easily interfaced with an Arduino UNO for real-time voltage monitoring. Below is an example code snippet:

// Define the analog pin connected to the sensor's OUT pin
const int sensorPin = A0; 

// Define the voltage divider ratio (5:1)
const float voltageDividerRatio = 5.0; 

// Define the Arduino's reference voltage (5V for most boards)
const float referenceVoltage = 5.0; 

void setup() {
  Serial.begin(9600); // Initialize serial communication at 9600 baud
}

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

  // Convert the analog value to a voltage (0-5V range)
  float outputVoltage = (sensorValue / 1023.0) * referenceVoltage;

  // Calculate the actual input voltage using the voltage divider ratio
  float inputVoltage = outputVoltage * voltageDividerRatio;

  // Print the input voltage to the Serial Monitor
  Serial.print("Input Voltage: ");
  Serial.print(inputVoltage);
  Serial.println(" V");

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

• Use short and thick wires for connections to minimize resistance and noise.
• Avoid placing the sensor near high-frequency components to reduce interference.
• If measuring high voltages, ensure proper insulation and safety precautions.

1. No Output Voltage

   • Cause: Incorrect wiring or no power supply.
   • Solution: Verify all connections, especially the VCC and GND pins.

2. Inaccurate Voltage Readings

   • Cause: Calibration error or noise in the circuit.
   • Solution: Calibrate the sensor using a multimeter and ensure proper grounding.

3. Output Voltage Exceeds 5V

   • Cause: Input voltage exceeds the sensor's maximum limit.
   • Solution: Ensure the input voltage does not exceed 25V.

4. Arduino Reads Incorrect Values

   • Cause: Incorrect reference voltage or code error.
   • Solution: Verify the Arduino's reference voltage and check the code for errors.

Q: Can this sensor measure AC voltage?
A: No, the Voltage Sensor DC 25V is designed for DC voltage measurement only.

Q: Is the sensor compatible with 3.3V systems?
A: Yes, the sensor can operate with a 3.3V power supply, but ensure the output voltage does not exceed the ADC range of your microcontroller.

Q: How do I extend the voltage measurement range?
A: You can modify the voltage divider circuit to increase the range, but this requires careful design and testing.

By following this documentation, you can effectively use the Voltage Sensor DC 25V in your projects for accurate and reliable voltage measurements.