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Hall Effect Sensor 90217 — Parallax Forums

Hall Effect Sensor 90217

malcolm3000malcolm3000 Posts: 12
edited 2009-06-06 03:02 in Propeller 1
I'm new to microcontrollers and have started playing with sensors. Currently I'm trying to read an input from the hall effect sensor with no luck. I have checked the sensor· using a simple test and it is working. However, I don't have enough output voltage from the sensor·for the chip to pick up an input. Do I need a different type of sensor or have the chip set up·to read the hall effect as an analog signal rather than a 3.3v input?

I have the spec. sheet and don't understand what V(Sat), Output Saturation Voltage, is.

Thanks,

Malcolm.

Comments

  • LeonLeon Posts: 7,620
    edited 2009-06-05 11:35
    Which sensor?

    Leon

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  • hover1hover1 Posts: 1,929
    edited 2009-06-05 11:57
    @ Malcolm - What is your supply voltage? Data sheet says minumum 3.5 volts. You can't run it from the 3.3 volt. If you run it from 5 volts, you will have to run the output through a resistor to the propeller's input pin. What voltage are you seeing on the output now?

    ·The following link shows a typical setup for a BS2 chip:

    http://www.parallax.com/Default.aspx?tabid=420

    ·There is an object in OBEX you can use for testing:

    http://obex.parallax.com/objects/98/



    @ Leon·- Melexis 90217 Hall-Effect Sensor (Parallax 605-00005)
    malcolm3000 said...
    I'm new to microcontrollers and have started playing with sensors. Currently I'm trying to read an input from the hall effect sensor with no luck. I have checked the sensor· using a simple test and it is working. However, I don't have enough output voltage from the sensor·for the chip to pick up an input. Do I need a different type of sensor or have the chip set up·to read the hall effect as an analog signal rather than a 3.3v input?

    I have the spec. sheet and don't understand what V(Sat), Output Saturation Voltage, is.

    Thanks,

    Malcolm.
    Post Edited (hover1) : 6/5/2009 12:44:26 PM GMT
  • malcolm3000malcolm3000 Posts: 12
    edited 2009-06-06 02:32
    Leon, Hover1,

    I finally got the sensor (its the hall effect 90217 sensor to work). I can now show it pulsing as the magnet passes by and have a counter to count the passes. I followed the schematic to the T and put in the correct sized capacitor, which now seems to light up the LED brighter. I'm still using the 3.3V??. I do see it requires minimum of 3.5V (perhaps 3.5V is for the higher end performance of the sensor). I'm running a gearbox that spins an arm with the magnet at about 80 rpm.

    Thanks,

    Malcolm.
  • hover1hover1 Posts: 1,929
    edited 2009-06-06 03:02
    malcolm3000 said...
    Leon, Hover1,

    I finally got the sensor (its the hall effect 90217 sensor to work). I can now show it pulsing as the magnet passes by and have a counter to count the passes. I followed the schematic to the T and put in the correct sized capacitor, which now seems to light up the LED brighter. I'm still using the 3.3V??. I do see it requires minimum of 3.5V (perhaps 3.5V is for the higher end performance of the sensor). I'm running a gearbox that spins an arm with the magnet at about 80 rpm.

    Thanks,

    Malcolm.
    Hi Malcolm - Great that you got it working!

    Since you posted in the Propeller forum, I am assuming you are using the Propeller to interface with the 90217. So you used 3.3V to power the sensor and it worked?· I'm not sure where the LED comes in. Is that just to show the output pulses visually? And what code did you finally end up using to test it? Would be great to share that with us newbies tongue.gif
    Jim
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