Tags: Current, Sensor, Module, MAX471,

Current Sensor Module MAX471

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    The MAX471 is a solid alternative to an ACS712 for measuring DC Current.   Its a high side device that is powered by a load source that can range anywhere from 3 to 36 VDC.   That said, a key benefit is its scale factor as it outputs 1 volt per amp measured.This tutorial wil..

    The MAX471 is a solid alternative to an ACS712 for measuring DC Current.   Its a high side device that is powered by a load source that can range anywhere from 3 to 36 VDC.   That said, a key benefit is its scale factor as it outputs 1 volt per amp measured.

    This tutorial will walk you through some of the basics necessary to put this device to use.

    There a few varieties available,  but they are basically the same.

    Getting a Max471

    The MAX471 is available from these online locations

    eBay             Amazon

    MAX471 Current Sensor Module Pin Outs

    There are five pins of interest for this device.   The image below, identifies them.

    MAX471 Arduino Current Sensor Pin OutsRS+:  This connects to the positive pole of your supply source.

    RS-:    This connects to the high side of your load.

    GND:  This is circuit common on both the input and the output side.

    OUT:  This is an analog output that provide 1 volt DC per amp measured.  The device can measure up to 3 amps DC.

    How the MAX471 is Installed in the Circuit

    As a high side current sensor, positioning is important, especially since the chip gets its power from the load’s source.

    The picture below is intended to help you to visualize that requirement.

    MAX471 High Side Connection ExampleNotice how the power supply positive terminal is connected to R+.    Also notice how R- is connected to the positive side of the load.  Finally, take a gander a the module ground connection.  It is connected to the negative side of the power source.

    Arduino MAX471 Current Sensor Module Arduino Tutorial

    Make the Tutorial Connections

    I’m using my trusty Minghe B3603 to drive a 10W LED.   I like the B3603 because I can monitor the relative validity of the results seen on my serial monitor.   The 10W LED for this tutorial as well.

    MAX471 Arduino Tutorial Hook UpCopy, Paste and Upload the MAX471 Arduino Sketch

    The sketch is nothing more than a Simple Arduino Voltmeter that has been modified for this device.  At a scale factor of 1V per Amp,  it is very convenient.

    /*
    Henry's Bench
    MAX471 Tutorial
    */
    const int max471In = A0;
    
    int RawValue= 0;
    float Current = 0;
    
    void setup(){  
      pinMode(max471In, INPUT);
      Serial.begin(9600);
    }
    
    void loop(){  
      RawValue = analogRead(max471In); 
      Current = (RawValue * 5.0 )/ 1024.0; // scale the ADC  
           
      Serial.print("Current = "); // shows the voltage measured     
      Serial.print(Current,3); //3 digits after decimal point
      Serial.println(" amps DC"); //3 digits after decimal point  
      delay(1500);  
    }
    

    Verify Your Tutorial Results

    Open your serial monitor and verify your results.  If you’re successful,  you should see current readings that are close to what you expected.

     

    MAX471 Tutorial Results

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