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Can you identify class of this part?

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bluerobin:
Hello to you all,

Attached is the photo of Coghlan's Big Screen Digital Compass. I am trying to identify the class of two green parts (circled). I've looked at the board and these two are the best candidates for the magnetic field detectors due to their north/south and east/west alignment. I would suspect these are hall effect linear field sensors, but all parts i can find on digikey have 3 contacts not two. The other alternative is the reed switch which matches in shape but not quite in functionality.

Anyone has an idea?


JohnS_AZ:
Damn I'm good.   ;D




--- Quote ---PNI Corporation's Magneto-Inductive (MI) magnetic sensors are based on patented technology that delivers breakthrough, cost-effective magnetic field sensing performance. These sensors change inductance by 100% over their field measurement range. This variable inductance property is used in a patented temperature and noise stabilized oscillator/counter circuit to detect field variations. The Sensor Driver ASIC is the recommended implementation of this patented circuit, and can be used with the SEN-L to construct a magnetometer with up to 3-axes.
--- End quote ---

Toward the bottom of the following web page you'll see the part and links to the datasheet and ap-notes.

http://www.willow.co.uk/html/oem_compass.html

Time:

--- Quote from: JohnS_AZ on October 26, 2010, 04:15:10 pm ---Damn I'm good.   ;D




--- Quote ---PNI Corporation's Magneto-Inductive (MI) magnetic sensors are based on patented technology that delivers breakthrough, cost-effective magnetic field sensing performance. These sensors change inductance by 100% over their field measurement range. This variable inductance property is used in a patented temperature and noise stabilized oscillator/counter circuit to detect field variations. The Sensor Driver ASIC is the recommended implementation of this patented circuit, and can be used with the SEN-L to construct a magnetometer with up to 3-axes.
--- End quote ---

Toward the bottom of the following web page you'll see the part and links to the datasheet and ap-notes.

http://www.willow.co.uk/html/oem_compass.html



--- End quote ---

lol nice

bluerobin:
great, thank you very much!

Too bad i can't find it on any of my regular distributors (digikey, etc). I bet it would be a much cheaper solution than the $20 HMC5843. The whole digital compass was selling for $18 on amazon.

JohnS_AZ:
I doubt it would actually be cheaper.

You'd need two or three of the sensors, and their ASIC to drive them all.

IMHO, $20 for the HMC part is really quite a bargain, considering it's a 3-axis magnetometer with a pretty simple interface. The Coghlan is only two axis, which is why you have to hold it flat and level to get an accurate reading.

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