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Retired RETIRED

This product has been retired from our catalog and is no longer for sale.

This page is made available for those looking for datasheets and the simply curious. Please refer to the description to see if a replacement part is available.

Replacement: None. We are no longer carrying these MicroMags in our catalog. This page is for reference only.

Description: PNI Corp's 3-axis magnetometer. Ready for the big time? Low noise, large resolution magnetic field sensing all packed into a user-friendly DIP module at your disposal. Stable over a wide temperature range, the MicroMag3 is a must have for orientation sensing and navigation.

Features:

  • 500uA @ 3.3V DC
  • Field measurement range +/-1100uT
  • Resolution as low as 0.015uT
  • SPI interface - no additional circuitry needed

Documents:

Comments 10 comments

  • When using the example code, the program hangs at readAxis(1) (the y-axis), because it keeps waiting for DRDY to get pulled high. It only occurs with the y-axis, the x and z-axis behave normal. What causes this and how can I solve it?

    • If you have access to a multimeter, ensure that the traces make a connection to the y-axis sensor. Also, try testing the resistance of the y-axis sensor (should read ~36 ohms, as well as the x and z). I’ve had the same problem with a newer sensor.

  • Would I be able to use this to get angular orientation, like Euler Angles, in all 3 dimensions? I’d like to use this for a project that requires knowing angular positioning of a robotic arm.

  • Anybody knows the maximum sampling frequency it can reach? My experimental results indicate it can only reach 22Hz, which is very slow. Please give some suggestions on how to boost the sampling frequency. I am expecting a 500Hz sampling rate. Many thanks!

  • Anybody have any suggetions for coding this micromag3 sensor to just read mG as an EMF detector? Trying to use it as just measuring emf on all three axis with no negative numbers. When not near a field it should register as a 0 or close to 0.

  • A correction to the previous comment : you CAN release the chip select line during the measurement. It only has to be down during SPI communications : when sending the command, and when reading the result, preferably using an external interrupt on the DRDY line. The responsiveness of this magnetometer is so sharp (no hysteresis) that you can avoid using a gyro. See
    http://sailboatinstruments.blogspot.com/2011/02/custom-gyro-compass-phase-1.html

  • Please be aware, that this device is pretty slow and according to the datasheet you have to keep the chip select line down during the whole sampling process. This slows down all communication on the SPI bus. So if you have other slaves on the same bus read the datasheet carefully!

  • According to the datasheet and the data above, it works at 3.3V, however in wiring example it is connected to 5V. Which one is correct?

  • The code in the wiring example is needlessly slow - I replaced the delay(2) calls with delayMicroseconds(1), and it seems to work (but I have not tested it rigorously).

  • Any chance we could get a picture of this with the normal rulers?


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