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NE555 reset pin using transistor

bertus

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Nov 8, 2019
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Hello,

How do you trigger the sensor?
Is the magnet strong and close enough?
55100_hall sensitivity.png
Do you see the led change when the magnet is close to the sensor in my schematic?

Bertus
 

Alec_t

Jul 7, 2015
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I tried it now and ne555 output stays low and sensor stays high
That's what should happen, until the sensor is triggered. Sounds like the source of your problem is elsewhere.
 

tomcer34

Nov 20, 2021
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Nov 20, 2021
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Alright, I just found out that when sensor is connected on pin 4 and to gnd through 1k rezistor it's triggering some safety feature on it. So I will try different one. Or has someone any idea how to bypass it?
 

tomcer34

Nov 20, 2021
23
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Nov 20, 2021
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Hello,

How do you trigger the sensor?
Is the magnet strong and close enough?
Do you see the led change when the magnet is close to the sensor in my schematic?

Bertus
I'm using diomidium magnet or how it's called in english. Yeah it's strong. Problem is some safety feature on sensor. I don't see led turning on, when measuring with multimeter, sensor is just off, until I turn of and on circuit. I had this exact issue with my first design. I thought it had to do with flyback current, but I guess I was wrong. I will try linear sensor, but I didn't want to use, because its linear and in my application, there is more then one source of magnet pole I can say?
 

bertus

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Nov 8, 2019
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Hello,

Looking at the datasheet, the sensor latches until reverse magnetic field is given.

Bertus
 

Attachments

  • ss30at-ss40a-ss50at_latching_hall sensor.pdf
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tomcer34

Nov 20, 2021
23
Joined
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Hello,

Looking at the datasheet, the sensor latches until reverse magnetic field is given.

Bertus
I tried it after my problem started acquiring, but thanks for the tip. I will have to buy appropriate sensor for that I guess.
 
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