Good afternoon all. I’m helping my granddaughter build a Gaussmeter for a school project, my job is to source parts while she does the math and programming. We want to use an Arduino Nano and be able to stack magnets to a maximum 5000 gauss. I need assistance finding a Hall effects sensor that can meet her parameters. Can you help?
What parameters does the Hall effect sensor need? She can measure each magnet individually and then add the magnetic vectors to get the sum.
She wants to show that multiple magnets with known gauss (measuring each separately) when combined together will not loose or gain strength. I.e. if three 1500 gauss magnets are combined, the resulting single magnet will be 4500 gauss. To do this she needs a sensor that can read the combined field approx 4500 to 5000 gauss.
Doesn't the plan you are using to actually make the sensor show which Hall sensor to use?
The closes I can find can only get to 3000 gauss. That’s why I’m asking the experts if anyone knows of a sensor that can get us to 5000.
You might be surprised.
LOL. I’ve often wondered if the combined strength would be greater than the sum of its parts. We won’t know until we run the tests.
I’ve thought of trying to find a unidirectional sensor that would measure fro 0-5 volts instead of a linear sensor that reads +- 2.5 volts but have not had any luck finding anything (yet).
Have you looked at how a Gaussmeter is made?
Yes, I have built one in the past that measured +-800 gauss using a A1308 sensor.
Thinking outside the box here...
Maybe you can try an ACS712/20A or /30A, and see how sensitive it is to an external magnetic field.
Leo..
out of the box:
As the field strength decreases with the 3rd power of the distance if I recall correctly, you should be able to measure any field with any sensor by adjusting the distance. Determine the distance where the sensor tips saturation (or 90%) .
Then create a lookup table from a dozen different combinations.
Put them in spreadsheet, make an XY graph and determine the formula of the curve.