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I once had a Joy-IT KY-024 sensor board that uses the A3141 Hall sensor to output analog and digital signals. I lost that sensor and then bought the Joy-IT KY-003 because I don't need the digital output anyways and the whole board is smaller. The KY-003 uses the A3144 which, according to the data sheet, only has a different trigger point.

The four basic devices (3141, 3142, 3143, and 3144) are identical except for magnetic switch points.

But with the KY-003 I only get an digital output which confuses me because the KY-024 has an analog output that according to the data sheet is a

Direct measurement of the sensor unit

Even if this wouldn't be true, the only components on that board are some resistors and a comparator.

So how can I get an analog reading from the A3144, if it is possible at all?

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  • \$\begingroup\$ I don't think the KY-024 uses the A3144. This page says it uses the SS49E which has analog output: joy-it.net/en/products/SEN-KY024LM \$\endgroup\$
    – ErikR
    May 31, 2021 at 20:00

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You can’t modify the switch to become analog, so get the right part. But if you were to apply a coil with a triangular current of +/- 50 gauss at say 1kHz on the sensor...then. You might get a PWM output that may be LPF’d to create an analog signal.

So get the right part. You can’t make a pig “moo”.

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  • \$\begingroup\$ Thanks for your answer, do you have an idea how they got the analog readings on the other sensor, especially when they don't have anything else on the board? \$\endgroup\$ May 31, 2021 at 19:48
  • \$\begingroup\$ Lots of room inside for a different analog IC \$\endgroup\$ May 31, 2021 at 20:08

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