Use this forum to chat about hardware specific topics for the ESP8266 (peripherals, memory, clocks, JTAG, programming)
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By infrat
#72219 If anyone needs a solution for NodeMCU and QMC5883L there is my pending Pull Request on github to NodeMCU project for library version supporting both: HMC and QMC.
You can easily build it up from branch on my repository: ... 3l-support (or wait until NodeMCU maintainers will merge my changes into dev/master branch).