Online Development Notebook > Index > U4x1 Application Notes > App13: Angle Sensor

App13: Magnetic Angle Sensor


Use the U4x1 USB interface to read data from a SPI device to measure the angle of a magnetic field.


Interface a Philips KMZ43T magnetic angle sensor and a Philips UZZ9001 signal conditioner combination to a U4x1 USB device. The Philips UZZ9001 has an SPI interface which is compatible with the U4x1.


From Orion Propulsion:

Kudos for your U421 product.

We needed a way to measure changes in the magnetic flux angle in a terfenol-d experiment for NASA.  We selected the Philips KMZ43T sensor and UZZ9001 signal conditioner combo to measure the angle and the U421 USB discrete I⁄O device from USBmicro to interface the Philips parts to our PC USB port.  The UZZ9001 has an SPI interface which was very easy to connect to the SPI port on the U421 and in no time at all we had the hardware breadboarded.  For the basic software we found a similar project (#8) in the ODN which was easily modified to provide the initial code for testing and had this running in less than a day.  Having unsuccessfully attempted several USB-based projects before, I was impressed by how easy it was to develop a USB based project using the USBmicro U421.

Herman Pickens
Orion Propulsion Inc.

Hardware:  U401 USB Interface    U421 USB Interface   U451 USB Interface

Programming:  USBm DLL Programming    Download Files

Application Notes:  U4x1 Application Notes    Misc Applications and Information    FAQ

While every effort has been made to make sure that the information posted on this site is correct, the author can not be held liable for any damages whatsoever for losses as a result of the application of this information. Use this information at your own risk.

USBmicro can design your custom and semi-custom USB product. Email about USB design can be directed to " Robert " at

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