top of page

Current Sensor with Arduino

Updated: Aug 9

We use many electrical appliances in our daily life. Have you ever wondered how much energy these appliances actually consume?. We think about saving energy while paying the electricity bill. But, to save energy we must first know how much energy is actually been utilized. To keep track of this, there are many meters available for this purpose. We know the power rating of all the electrical appliances in our home. If we find out how much current each of these is consuming at every point, then it is possible to find the energy consumed by the appliances. We can then conserve energy by optimal usage of appliances. Now, we can measure the current consumed by using a current sensor with Arduino UNO.

Hardware requirements:

ACS712 Range Hall effect Current sensor: The ACS712 current sensor can be used for precise measurements of both AC and DC currents. This sensor is based on the Hall effect and the IC has an integrated Hall effect device.

ACS712 Range Current sensor
ACS712 Range Current sensor

The ACS712 is a fully integrated, hall effect-based linear current sensor with 2.1kVRMS voltage isolation and an integrated low-resistance current conductor. It has three terminals viz., Vcc, output, and ground terminals. The Vcc terminal is an input pin. In case if we connect it with an Arduino, we give 5V or 3.3V as the input. Analog output will give analog voltage proportional to the current passing through the chip is developed. Apart from this, there is a power indicator LED present which will turn ON during the operation.

What is hall effect:

Hall effect
Hall effect

When a hall element is placed within a magnetic field, the magnetic flux lines exert a force on the semiconductor material which deflects the charge carriers, electrons, and holes, to either side of the semiconductor slab. As these electrons and holes move sidewards, a potential difference is produced between the two sides of the semiconductor material by the build-up of these charge carriers. The effect of generating a measurable voltage by using a magnetic field is called the Hall effect.

Arduino UNO:

Arduino UNO
Arduino UNO

The Arduino is a programmable #microcontroller, it's an open-source electronics proto-type platform. It interacts with the user by receiving input with the aid of sensors and provides the output employing LED, buzzer, etc.,

In order to know more about the Arduino UNO, refer to this article.

12V DC fan:

12V DC Fan
12V DC Fan

We use a 12V DC fan as the load.

Power supply:

12V lithium ion battery
12V lithium ion battery

In this project, we use a 12V battery since our load is 12V.

Jumper wires:

Jumper wires
Jumper wires

Jumper wires are used to establish connections between different components in the circuit.

Software requirements:

Arduino IDE:

Arduino IDE - logo
Arduino IDE - logo

The Arduino Integrated Development Environment (IDE) is a cross-platform application (for Windows, macOS, Linux) that is written in functions from C and C++. It is used to write and upload programs to Arduino compatible boards, but also, with the help of third-party cores, other vendor development boards.

Circuit connection:

Circuit diagram
Circuit diagram

Circuit connection involves the following steps:

  • We connect the power source with the load and load in series with the current sensor.

  • The microcontroller we use here is Arduino UNO.

  • Thus, the Vcc of the current sensor is connected to the 5V pin of the Arduino.

  • And the analog output pin is connected to one of the analog pins (A0 to A5) of the Arduino UNO.

  • The ground pin of the current sensor is connected to the ground of the Arduino UNO.



Current Sensor with Arduino - Hardware circuit
Current Sensor with Arduino - Hardware circuit

The circuit is connected as per the above instructions. After uploading the code to the Arduino UNO, the circuit is powered and according to the load consumption, the sensor value, adcvalue, voltage, and current values will be displayed on the serial monitor. As the load changes, the values are repeatedly displayed on the serial monitor.

Video By - Sowmya G


See also:

Follow us -

Please do follow us i.e #learnelectronicsindia to get daily updates about new blogs, videos, courses, quizzes and contests.

Facebook | LinkedIn | Instagram | Youtube | Website | Gmail

Content Written by-

Name - Kiranmai Chigurupati

Portfolio Link - click here

416 views2 comments

Related Posts

See All
bottom of page