ESP8266 Community Forum

- Tue Jul 11, 2017 9:56 am #68155 Hey All!

After some weeks of headbanging and waiting for new magnetometer units to arrive (which also didn't work) I have finally discovered the following.

The common modules sold on fleabay, although marked 5883 are NOT HMC5883Ls but instead something called a QMC5883L! (mercy...)

I have found working Arduino code for these, hopefully at some stage we can incorporate it in the Lua codebase too, as these modules seem to be by far the most prevalent.

- Tue Jul 11, 2017 10:41 am #68156

hopefully at some stage we can incorporate it in the Lua codebase

Great, looking forward to a PR

https://frightanic.com/
https://nodemcu-build.com/
https://github.com/marcelstoer/nodemcu-pyflasher

- Tue Jul 11, 2017 10:55 am #68157

Great, looking forward to a PR

What's a PR, Marcel? Something to do with Public Relations?

Just kidding, I wish I had the time, at the moment I haven't even got a dev setup going, I am still working with your "custom builds". Maybe sometime soon, as I really would like to contribute to this project, but it's a bit in the hands of the gods at the moment.

Incidentally, if this was ported to Lua/NodeMCU do you you think it would be better to make it part of the existing hmc5883l module, transparently switching between modules depending on the I2C address it found (i.e. 0x1e or 0x0d) or as a separate module "qmc5883l"?

- Wed Jul 12, 2017 12:01 am #68175

Incidentally, if this was ported to Lua/NodeMCU do you you think it would be better to make it part of the existing hmc5883l module, transparently switching between modules depending on the I2C address it found (i.e. 0x1e or 0x0d) or as a separate module "qmc5883l"?

I was thinking about this after I posted the previous comment. Not being a C/firmware developer I can't give "authoritative" recommendations, though. Generally I'd say it should be a single module if the similarities outweigh the differences.

• Do the two chips have the same characteristics e.g. wrt timing?
• Is checking for the I2C address a reliable enough signal to tell them apart
• What would be the name of the module if it supported both chips?

https://frightanic.com/
https://nodemcu-build.com/
https://github.com/marcelstoer/nodemcu-pyflasher