Thank you for that excellent demonstration. It seems that the sensors that I have purchased (41F) are not the right ones for my current project so I shall have to buy some 3144 sensors. I wish that I had seen this video first.
really helpful explanation! I have a unipolar sensor I took out from a scooter motor hub. I'm trying to identify the part number but I can't because of the varnish covering the numbers. The output is always ON. It only turns off when I place magnet near it. Do you know what part number having this characteristic?
I built a circuid on the bread board using multiple hall sensors connected to each other to use the same analog input on arduino. That was working fine. Then I spent a lot of time building a pcb, and it didn't work. Both test and final hall sensors are 3144, but from different sellers. So I decided to test the final sensors on the bread board and boom. It turns out the final sensors are bipolar. But both are 3144. :(
It's not "bipolar" and "unipolar", it's just "latching" and "non-latching". Also the demonstration is for digital hall effect sensors which do not measure the strength of the field. If you want to measure the strength you need ratiometric hall sensors which this guy doesn't show
Thank you for your comment. The information about Unipolar/Bipolar comes from the manufacturer; I did not create it. The Unipolar model operates with only one magnetic pole, while the Bipolar model works with both magnetic poles (North and South) and also has the latching capability. Both, of course, are digital. The linear model provides analog output. Check the triple comparison video at ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-VhVj5FF8Qxo.html
@@engthink The non-latching (what you call unipolar) also works with both poles, so therefore is not unipolar: You can operate the device from one side with the north pole and from the other side with the south, so both latching and non-latching types use both poles just in different ways. Try it and you'll see.
Check on your own manufacturer's website www.allegromicro.com/en/insights-and-innovations/technical-documents/hall-effect-sensor-ic-publications/unipolar-hall-effect-sensor-ic-basics There is a Frequently Asked Questions and is it: Q: How does a north polarity, or negative, magnetic field affect a unipolar switch? A: A north polarity, or negative, field has no effect on a unipolar switch.
@@engthink I don't need to check: I have A3144s and can show you it working using a north pole. Also have you read this on that link: Q: Can I approach the device package back side with the magnet? A: Yes, ...for example, if the south pole was nearer the device in the front-side approach, then the north pole would be nearer the device in the back-side approach... This states quite clearly the the device works fine with a north pole on the "back-side"
Indeed, this occurs because when you approach the back of the sensor, the north pole generates a positive field; however, the model is still classified as unipolar by all manufacturers. Another point to note is that it's not typical to use the sensor from the back; in the case of SMD hall sensors, the approach can only be from the top.
I don't know if you will find a Hall sensor with this characteristic, so you can use the 49E model and add diodes in series at the output to cancel the voltage when there is no magnet (4 or 5 diodes 1N4142). The power supply must be between 7 or 8Vdc.
I’m trying to create a voltage divider using a linear hall sensor where I’m detecting a change in orientation of my magnet. My voltage source is 5V. Any help would be much appreciated
