VOLTAGE SENSOR

A voltage sensor is a conventional method used to determine, monitor, and measure the supply of voltage in a device. Voltage sensors can sense both AC and DC voltages. Voltage sensors are highly precise sensors that work on the principle of the potential divider rule. As a result, it reduces the input voltage by a factor of 5. This allows us to use the analogue input pin of microcontrollers to observe the voltage above the threshold level. With a small compact device, both voltage and current measurement are combined to a single physical device. For 0-5v analogue input, the output measured up to 25v. A voltage sensor consists of 5 pins in which two of which are on the two-pin screw terminal and three are male header pins.

PIN DESCRIPTION

•  VCC: Positive terminal of the voltage to be measured (0-25V)
•  GND: Negative terminal of the voltage to be measured
•  S: Analog Input of Arduino
• +: Not connected (N/C)
•  –: GND of Arduino

The Interfacing of a voltage sensor with Arduino or any other microcontroller is quite simple. The VCC and GND of the voltage source are connected to the screw terminals of the voltage sensor. And the S and – (GND) pins are connected to the Analog pin and GND of Arduino respectively. Moreover, the screw terminals present in the module provide an easy and secure connection to a wire.

In a voltage sensor, Arduino AVR chips have 10-bit AD, thus it provides a resolution of 0.00489V (5V/1023). So the minimum voltage of the input voltage detection module is 0.00489Vx5=0.02445V.