Current/Voltage Sensor

Q: 4. Applications of Current Voltage Sensors

Detection of Power FailurePower demand controlDetection of Faults in a CircuitTemperature control

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Sensor Categories

Linear Current Sensors – Includes Hall-effect based sensors (ACS712, ACS723, ACS758, etc.) that provide analog output proportional to AC or DC current. Ideal for measuring load current, power consumption, and overcurrent protection.
Voltage Sensors – Includes voltage divider modules, high-voltage detection sensors, and ADC-based boards used to measure DC voltage levels in batteries, power supplies, solar systems, and DIY electronics.

Applications

Energy monitoring and power consumption analysis
IoT device measurement and remote sensing
Robotics and motor current tracking
Battery voltage monitoring and solar power systems
DIY electronics and embedded development
Overcurrent/overvoltage protection systems

Wiring Diagrams & Arduino/Raspberry Pi Examples

ACS712 / ACS723 Linear Current Sensor → Arduino

ACS712 Pin     → Arduino
-----------------------------
VCC             → 5V
GND             → GND
OUT (Analog)    → A0

Load wire passes through the sensor module.

Arduino Example Code – Read Current (ACS712)


const int sensorPin = A0;
float sensitivity = 0.185;  // For ACS712 5A version
float offset = 2.5;         // Midpoint voltage

void setup() {
  Serial.begin(9600);
}

void loop() {
  int value = analogRead(sensorPin);
  float voltage = value * (5.0 / 1023.0);
  float current = (voltage - offset) / sensitivity;

  Serial.print("Current: ");
  Serial.print(current);
  Serial.println(" A");

  delay(500);
}

Voltage Sensor Module (0–25V) → Arduino

Voltage Sensor Pin → Arduino
-----------------------------
VCC                 → 5V
GND                 → GND
OUT (Analog)        → A1
Battery +           → VIN+
Battery –           → VIN-

Arduino Example Code – Read Voltage


const int voltagePin = A1;
float factor = 5.0;  // Depends on voltage divider ratio

void setup() {
  Serial.begin(9600);
}

void loop() {
  int raw = analogRead(voltagePin);
  float voltage = (raw * (5.0 / 1023.0)) * factor;

  Serial.print("Voltage: ");
  Serial.print(voltage);
  Serial.println(" V");

  delay(500);
}