Comimark 2Pcs GY-273 HMC5883L 3V-5V Triple Axis Compass Magnetometer Sensor Module for Arduino

As many others have noted, this board is based on a QMC5883L (I2C address 0x0D) and not a HMC5883L as the chip itself is labeled. I have successfully used it with the QMC5883LCompass library for ESP32 and it works just fine except for calibration problems. Thanks to another reviewer I found that the header pins that the vendor supplied with the module have iron in them and so are distorting the readings to such an extent that the calibration routine supplied with the Compass library cannot fully compensate. As a result I cannot get an azimuth reading in the range of 0 to 359. I will have to replace the header pins with some I have tested with a magnet to ensure they do not have any iron in them, and then rerun the calibration test to get the calibration parameters for my sketch. This whole challenge could easily have been mitigated if the vendor had bothered to do a simple magnetic test on the shipped header pins. This is extraordinarily poor QA, considering that this module is iron sensitive by its very nature since it is a magnetometer. The vendor should include a warning in their listing to check that any pins used are not magnetic before soldering them onto the board. That would have helped me a lot. Giving us non-magnetic pins would be even better, vendor take note! All that said, these seem to be perfectly good QMC5883L modules. I just recommend testing the header pins with a kitchen magnet before soldering them to the board. If you're like me you probably have a junk box lying around with other header pins that you could substitute if the delivered ones prove to be magnetic.

As of December 2022 they are shipping QMC5883 units. Easy to tell ... just run the i2C scanner. If you see 0x0D it's a QMC, a 0x1E it's a HMC part. That said, I proceeded to test it out. Worked ok and is pretty stable, needing less filtering than a AK8975.

This sensor works great with inav!

Not as advertised or as reported in other reviews. My boards came with the QMC5883P which use a i2c address of 0x2C which requires a DIFFERENT software library than the QMC5883L (0x0D). Therefore these did not work for me. BEWARE substitutions during production runs. Which one will you get? Flip a coin!

Despite the HMC markings, it's actually a knockoff. As somebody else said, when running an i2C scanner, if you see 0x0D it's a QMC, and 0x1E it's a HMC part. Needed to supply the QMC5883L Magnetometer instructions on ESPHome to make it work. But it does seem to work once configured correctly, so there's that.

This is a QMC5883L (despite being labeled HMC5883L). I would just buy from another supplier since this one is not advertised properly. Managed to make it run but it was overly complicated unnecessarily.

If the IC marking is to be believed, these are in fact HMC’s, not QMC’s as the other reviews would indicate. L883 = HMC, whereas 5883 is QMC. I needed QMC’s, so I listened to the other reviews and assumed that’s what this would be, but this seller must’ve switched to the right chip since those other reviews were made. I did not test the chip to see if it’s actually a QMC, but I won’t bother, seeing that if the marking is incorrect and has been mislabeled, this chip is not trustworthy to begin with.

Neither of the two devices worked - sending them both back!

Very good