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Suggestions for a sensitive, hall effect sensor to be used with an arduino?

I'd like to find the an inexpensive, highly sensitive hall effect sensor.  One that could possible sense a strong magnet from several inches away or within someone's hand if they were holding a strong magnet in their closed fist.

I am looking for a non-latching sensor that would trigger when a magnet is in the neighborhood - say at least 6".  So the range and shape of the field of detection is important.

Imagine that we're playing a game of "which hand is the strong rare-earth magnet in?"  I have a small hall-effect sensor hidden on my palm.  What type of non-latching hall effect sensor would pick up the field through the hand from a distance of about 6 inches or more?


iceng11 months ago
Go to Jameco Electronics for a smorgasbord of Hall sensors.
  • Unipolar
  • Bipolar
  • cheap
  • Expensive
  • PDFs
  • Etc etc
You will have to find the one you want yourself by reading up on their
sensitivities.
Jameco has help files for you to peruse :)

A
konjurer (author)  iceng11 months ago
Thank you for the recommendation...but I was hoping for an answer from someone who has experience with different sensors that could recommend a particular sensor for the scenario I described. I don't know to decipher the sensor data sheets into something that would answer my question as it pertains to the use case.

I am looking for a non-latching sensor that would trigger when a magnet is in the neighborhood - say at least 6". So the range and shape of the field of detection is important.

Imagine that we're playing a game of "which hand is the rare-earth magnet in?" I have a small hall-effect sensor hidden on my palm. What type of non-latching hall effect sensor would pick up the field through the hand from a distance of about 6 inches or more?

steveastrouk11 months ago
To be honest, I'm not sure a Hall sensor is the right choice here. You'd be better with a compass chip, for sensitivity, which is kind of magnetometer. Compass chips work to full-scale with a field of only 4 gauss, whereas most hall sensors I know of need 10s or 100s of gauss to reach fullscale output. Compass chips also contain 3-axis magnetometer, and halls are usually uni-axial

Try something like a Honeywell HMC5843 - its a digital output, ideal for the Arduino.
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