Hi,
I have read about filtering the Hall Effect sensor. I still dont understand the whole setup. Can some one please tell me which wire and resistors go to which exact pins. I will really appreciate it. :ahh: :yikes:
I am definitely NOT an EE, so I may have it all wrong, but I think the filtering you’re talking about only applies to ANALOG devices. The Hall effect gear tooth sensor is a digital sensor, so I don’t think it applies.
We are using the Hall Effect sensors without filtering and it works just fine.
I would only filter if you encounter a problem… JMHO…
Yeah but what i heard is you need to place a 20 Ohms or 500 ohms resistor to filter the noise. I don’t know anything about it and I heard people saying that so I was just wondering if it is necessary to place the resistor and if yes than where? Thanks guys for your reply :ahh: 
Have you read the data sheet? http://www2.usfirst.org/2005comp/Specs/gths1.pdf
Obviously someone you trust has told you they are necessary, or you wouldn’t still be questioning it after 2 people have said they aren’t necessary in this thread. You could ask these people to fight to the death, and use the winner’s suggestion, however I don’t think that is likely.
Just asking if they are necessary isn’t likely to help you make up your mind any better then you already have. A better question would be to ask what type of analysis did people do to decide that they were or were not necessary. From there you can make your decision on which argument seems more complete.
For the record, it can be just as necessary to filter a digital signal as an analog signal, particularly a high speed one.
The low-value resistor is for filtering any noise on the power input to the sensor. It needs to be accompanied by a capacitor to ground at the power pin in order to do any actual filtering.
The five volt power supply from the Robot Controller is pretty clean, and probably doesn’t need to be filtered. The RC digital inputs are of low enough impedance that the output signal from the sensor probably doesn’t need to be filtered either. Unless you’re running the wires from the RC to the sensor in parallel with motor power leads, I wouldn’t expect you to have any noise problems.