This paper introduces the main features and pinout of Honeywell\'s HMC and HMR series magnetoresistive sensors, and discusses in detail the features, commands, data formats and application precautions of the HMR2300 magnetoresistive sensor. Finally, the application circuit of one-dimensional and two-dimensional constant current source measurement and digital interface using Honeywell\'s magnetoresistive sensor is given, and the three-dimensional magnetic field measurement circuit composed of HMC2300, ADC, microcontroller, RS232 interface and set/reset circuit is also given. Key words: magnetoresistive sensor; measurement; magnetic field; HMR2300
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