lowpass RC circuit equations

Archiver

As our peers have informed us,, a RC Low Pass circuit is most common
way to remove high frequency noise from mechanical systems.
From the top of my head:

ADCinput

---

/\/\/\

---

Sensor
| R
|
--- C
---
|
|
Ground

Use the basic equations:
W = 1/(RC) and H = 1/(sqroot of 2)
where W is the frequency(Hz) where the attenuation or removal of high
frequencies begin and H is the rate of removal in db/Hz, I think.
Use R in terms of Ohms, and C in terms of Farads.
Depending on your expected rate of response,, a mechanical homemade
robot is usually no faster than 10Hz, that is 10 movements per
second. Try starting with high R values around 20K....
have fun...I have used this method very much..
regards,
Ray


--- In basicstamps@yahoogroups.com, "sjoblin001 <steven_joblin@h...>"
<steven_joblin@h...> wrote:
> Was wondering if anyone can point me to a good article (or better
> yet, provide me via this forum) on basic filtering techniques. I
am
> building a robot with a bunch of sensors that seem to be acting
> erratically. I am pretty sure that it is because I have signal
> leakage all over. Any good tips on what value and type capacitors
I
> should use, where they should go, and other "best practices" I
should
> be using.
>
> Thanks,
>
> Steve