The ACS712 is a single-chip current sensor for monitoring currents up to 30 amps DC or 15 amps AC. It consists of a magnetic field sensor and a signal processing circuit that converts the sensor output to a proportional analog voltage. The sensor operates with the aid of a 5V voltage reference supplied by the external power source, but it has a built-in 3V reference for internal use.

What can I use ACS712 for?

The ACS712 can be used to measure currents in both AC and DC applications. This device is very popular for measuring the current in the alternator of a car. A very common application is for the car's on-board computer. With the help of the ACS712, the on-board computer can measure the current consumption of the car, and then use the information to control the charging system of the car.

How to use the ACS712 to measure the current

When measuring the current with the ACS712, the current path is not broken. The sensor is mounted on the wire of the current to be measured. The current will pass through the magnetic field sensor, and the sensor will output a voltage that is proportional to the current. This voltage is then converted to a current signal by an external amplifier and then sent to the ADC (Analog-to-Digital Converter) of the microcontroller to get the current value.

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