Hall Effect Sensor - Measuring strength of magnetic field with Qwiic analog

This page contains a simple example with function documentation on how to take measurements using the SI7211-B-00-IV Hall effect sensor and the Qwiic connection.

Qwiic Analog output example

#include "Hall-Effect-SOLDERED.h"

// To change the reading, place a magnet in front of the sensor

// Declare sensor object on default address
HallEffect_Analog_EasyC hall;

void setup()
{
    // Initialize serial communication
    Serial.begin(115200);

    // Initialize sensor via EasyC (required!)
    hall.begin();

    // If you wish to use a custom address (e.g. 0x33), use
    // hall.begin(0x33);
}

void loop()
{
    // Read raw measurement
    uint16_t hallRawReading = hall.getRawReading();
    
    // Read milli Teslas
    float hallMilliTeslas = hall.getMilliTeslas();

    // Print sensor values to serial
    Serial.print("Analog Hall Effect raw sensor reading: ");
    Serial.println(hallRawReading);
    Serial.print("Which is: ");
    Serial.print(hallMilliTeslas);
    Serial.println(" mT\n");
    
    // Wait a bit until next measurement
    delay(1000);
}

HallEffect_Analog_EasyC hall()

Creates analog sensor object

Returns value: none

hall.begin()

Initializes analog sensor object

Returns value: Returns true if initialization is successful, false otherwise.

Function parameters:

Type	Name	Description
uint16_t	address	Optional, used for changing breakout address, default is 0x30

hall.getRawReading()

Requests a new reading from the SI7211-B-00-IV sensor.

Returns value: Returns int value from output pin

hall.getMilliTeslas()

Calculates the value of magnetic induction from current reading

Returns value: Returns float value that represents magnetic induction in milli Teslas

Sensor when magnet is not present

Serial Monitor output

Sensor when magnet is present

Serial Monitor output

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Full example

Try all of the above mentioned functions in this full example which measures the strenght of magnetic field.

analogReadEasyC.ino

Example file for using analog Hall effect sensor with easyC/Qwiic/I2C