Arduino Current Measurements

Measuring Power and Capacity

If you’re measuring power or battery capacity,  measuring current will likely be one of the measurements you include.   Fortunately, there are several devices on the market to help you to accomplish this.

I’ve played with a few and the articles listed below will introduce you to them.

ACS712 Current Sensor on Amazon

ACS712 Current Module User Manual


This manual for the ACS712 Current module provides an overview, specs, connections and the datasheet for the Allegro chip upon which is based.

The module comes in three flavors: 5A, 20A and 30A.

Its not an overly complicated device. You just need to know how to interpret it.

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ACS 712 Basic Hook Up

ACS712 Current Module Arduino Tutorial


Using an ACS712 Current Sensor with your Arduino is really simple stuff.

This article provides you with sample code and drawings.

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ACS712 AC Current Tutorial Logo

AC Current with an ACS712 Tutorial


If you’re interested in how much power your AC powered widget is using, you will need to measure the current.

This tutorial shows you how to use your Arduino with and ACS712 to do just that.

There’s a little basic theory here, but not too much. Just enough to get you started.

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INA219

INA219 Arduino Current and Voltage Sensor Tutorial


This little device measures both current and voltage. It therefore gives you the ability to measure power.

The current range is up to 3.2A.

Voltages up to 26 volts can be measured as well

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TA12-100 Arduino AC Current Sensor Pinouts

TA12-100 Arduino AC Current Sensor Tutorial


You are able to measure AC current by passing a wire through the center of the current transformer and measuring the voltage across a resistor place at the transformer output.

This device is good for up to 5A.

The tutorial shows how to hook it up and make use of it immediately.

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Max471 Image

MAX471 Arduino Current Sensor Tutorial


Learn how to put this 3 amp current sensor to us in your next project.

The MAX471 is a high side sensor that is easy to implement in code.

Includes drawings, tutorial and sketch.

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MAX471 Arduino Power Meter Tutorial Logo

MAX471 Arduino Power Meter


Measuring power requires at least two of the three variables found in Ohms law.

The MAX471 measures both current and voltage.

With these values, you can measure power

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ACS758 Tutorial Feature Image

ACS758 Arduino Current Measurement Tutorial


The Allegro ACS758 has ranges from 50A to 200A.

This tutorial will allow provides a basic functional description and shows how to make a current measurement using an ACS758.

Includes pin outs, tutorial and sketch.
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