GY-271 works with Mega but not ESP32

Other Hardware Sensors
1

I am trying to use the GY-271 with a HiLetgo ESP-WROOM-32 ESP32 and it is not showing heading correctly. Always show something like 96.2 or 54.6.

Code used for the ESP32(Same code used for arduino mega but SCL/SDA pins changed)

/*
 * 
 * Compass.ino - Example sketch for reading a heading from an HMC5883L triple axis magnetometer.
 * 
 * GY-273 Compass Module  ->  Arduino
 * VCC  -> VCC  (See Note Below)
 * GND  -> GND
 * SCL  -> A5/SCL, (Use Pin 21 on the Arduino Mega)
 * SDA  -> A4/SDA, (Use Pin 20 on the Arduino Mega)
 * DRDY -> Not Connected (in this example)
 * 
 * Voltage Note
 * ~~~~~~~~~~~~  
 * The GY-273 Board has a 3v3 Regulator on it, and the SDA/SCL are pulled up to that so it is OK to 
 * use with 5v Arduino's.
 * 
 * If you are using any other breakout, or the raw IC, you need to be using 3v3 to supply and signal!
 * 
 * Datasheet: http://goo.gl/w1criV
 * 
 * Copyright (C) 2014 James Sleeman
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a 
 * copy of this software and associated documentation files (the "Software"), 
 * to deal in the Software without restriction, including without limitation 
 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 
 * and/or sell copies of the Software, and to permit persons to whom the 
 * Software is furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in 
 * all copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 
 * THE SOFTWARE.
 * 
 * @author James Sleeman, http://sparks.gogo.co.nz/
 * @license MIT License
 * 
 */
#include <Arduino.h>
#include <Wire.h>
#include <HMC5883L_Simple.h>

#define I2C_SDA 21
#define I2C_SCL 22

// Create a compass
HMC5883L_Simple Compass;

void setup()
{
  Serial.begin(9600);
   Wire.begin(I2C_SDA, I2C_SCL);
    
  //setup compass
  Compass.SetDeclination(-7, 35, 'W');  
  Compass.SetSamplingMode(COMPASS_SINGLE);
  Compass.SetScale(COMPASS_SCALE_130);
  Compass.SetOrientation(COMPASS_HORIZONTAL_X_NORTH);
  
}
// Our main program loop.
void loop()
{
   float heading = Compass.GetHeadingDegrees();
   
   Serial.print("Heading: \t");
   Serial.println( heading );   
   delay(1000);
}

It does work with an Arduino Mega but not on the ESP32. It is also strange it says it is a QMC5883L but has the HMC5883L address of 0x1E and works on Mega with HMC5883L_Simple.h Library.

Link to GY-271 sensor

Link to ESP32

2

Welcome to the pains of Arduino clones.

Espressif uses ARM cpu 32-bit technology. Arm CPU Architecture – Arm®

AVR uses Atmel (now Infinion) 8-bit technology. 8-Bit AVR® Core - Developer Help (microchipdeveloper.com)

Libraries and core-code are different or have conditional compliation to deal with architectural differences.

Try different library as a start. Always explore working code to use as a skeleton on which to build your code.

3

Maybe because this library is not compatible with ESP32.

The last update of this library was in 2017.

Try this:

1 Like
4

That works! Thanks!!!

5

Glad to hear!

You can mark the post above as solution.

6

This topic was automatically closed 180 days after the last reply. New replies are no longer allowed.