Over load monitoring and Protection using Arduino & ACS712 Current sensor

(Last Updated On: February 13, 2020)

over load monitoring


over load monitoring using Arduino- In this tutorial, you will learn how to make an overload monitoring system using Arduino and ACS712 current sensor.  This is the second part of the SCADA application based grid station parameters monitoring system.

While the first part was based on the AC voltage monitoring system. In which we successfully monitored the Normal voltage…overvoltage and under voltage. So far we can monitor the voltage and load on our SCADA application, if we increase the voltage above a pre-defined value It will provide the automatic disconnection. while during the normal voltage the led remains ON.  Now if I decrease the voltage below a certain pre-defined value, it will provide automatic disconnection and the led will be turned off. In the end, we will connect a relay with pin number 13 so that in case of overvoltage or under voltage the supply can be disconnected to protect our appliances from any damage.

For the demonstration purposes, this project is designed in such a way that it shows normal load for one light bulb and overload status when another bulb is connected or the load is increased. For the best understanding watch video tutorial Click Here”. The load value can be set in the programming as per your requirements….

In this tutorial, we will cover

  1. ACS712 current sensor Pinouts
  2. Complete circuit diagram
  3. Interfacing
  4. Programming and finally
  5. Testing

The components and tools used in this project can be purchased from Amazon, the components Purchase links are given below:

Arduino Uno: https://amzn.to/2tVz1vu
Mega 2560: https://amzn.to/2ze1kdu
Acs712 current sensor: https://amzn.to/2zAdjjs
one channel relay module: https://amzn.to/2Q5B399
lm7805 Voltage Regulator: https://amzn.to/2IZEl5x
330 ohm resistors pack: https://amzn.to/2NtlAeh
5v 2A adaptor: https://amzn.to/2GsNfcw
2n2222 npn transistors: https://amzn.to/2EmXsIb
10k Resistor: https://amzn.to/2KTd6OW
lm7805 Voltage Regulator: https://amzn.to/2IZEl5x
330-ohm resistors pack: https://amzn.to/2NtlAeh
female DC power jack socket: https://amzn.to/2KEo1gt
470 uf capacitors: https://amzn.to/2xDCOzf
5×7 cm vero board: https://amzn.to/2OHGbvn
female headers: https://amzn.to/2zqmtiJ
connection wires: https://amzn.to/2DpBuW7
Super Starter kit for Beginners: https://amzn.to/2KJvmKG
Jumper Wires: https://amzn.to/2KMoVXs
Bread Board: https://amzn.to/2MS4q8X
12v Adaptor: https://amzn.to/2Ntr6h1
PCB plate: https://amzn.to/2IUwpCt
Variable Supply: https://amzn.to/2MT4Qfj
Digital Multimeter: https://amzn.to/2Nvft9i
Vero Board / strip board: https://amzn.to/2MTf9jD
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Please Note: these are affiliate links. I may make a commission if you buy the components through these links. I would appreciate your support in this way!

over load monitoring

This is the ACS712 current sensor.

over load monitoring

as you can see it has three male headers labeled as vcc..out and ground…vcc will be connected with the Arduino’s 5v..the out pin will be connected with the Arduino’s Analog pin A1 and the ground will be connected with the Arduino’s ground..

over load monitoring Circuit Diagram:

over load monitoring

This is the complete circuit diagram of the over load monitoring system, this schematic is designed in cadsoft eagle 9.1.0 version. If you want to learn how to make schematics and pcb’s then watch my tutorial.

This is the ACS712 Current sensor, the vcc is connected with the Arduino’s 5v, the ground is connected with the Arduino’s ground and the out is connected with the Arduino’s analog pin A1…This current sensor is connected in series…The relay is connected with pin number 13 of the Arduino… This relay provides the disconnection when load is increased… For the relay driver circuit design calculations watch my tutorial, the link is given in the description.

Cut any of the two wires and connect the current sensor in series…now let’s fix the current sensor , Arduino and relay module on a hard board….Now its ready for the interfacing…connect red jumper wire with the vcc of the current sensor….connect yellow wire with the out pin of the sensor and finally connect white wire with the ground…now connect red wire with 5v, white wire with the ground and yellow wire with the analog pin A1…connect the relay module with pin number 13… and connect the blue wire which is the ground wire with the Arduino’s Ground…


Watch Video Tutorial:

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About the Author: Engr Fahad

My name is Shahzada Fahad and I am an Electrical Engineer. I have been doing Job in UAE as a site engineer in an Electrical Construction Company. Currently, I am running my own YouTube channel "Electronic Clinic", and managing this Website. My Hobbies are * Watching Movies * Music * Martial Arts * Photography * Travelling * Make Sketches and so on...

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