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General Category => General Discussion => Topic started by: IMIC on September 10, 2013, 05:21:52 AM

Title: RF circuit to control 3 servos
Post by: IMIC on September 10, 2013, 05:21:52 AM
Hi everyone,

This is the first time I post on this website so apologies for any mistakes I make :)

I am doing my final year uni project and it consists of building a RF circuit (Transmitter and receiver) that will control 3 servo motors. I have been looking for days at different circuits and IC's compatible with each other but to no avail.

Any form of help will be great.

Thanks
Title: Re: RF circuit to control 3 servos
Post by: cheerio on September 10, 2013, 21:06:55 PM
What exactly are you looking for?
Do you need short range RF? Try RFM70 (old one) or RFM73 (new one).
Do you need long range RF? Try RFM12 or RFM22.

Do you need smth else?
Title: Re: RF circuit to control 3 servos
Post by: Sir N on September 12, 2013, 19:01:38 PM
Hi,

I am doing my final year uni project and it consists of building a RF circuit (Transmitter and receiver) that will control 3 servo motors. I have been looking for days at different circuits and IC's compatible with each other but to no avail.
Why to no avail? Didn't you understand them, were they too costly, or what?

For a final year student, you should be able to read your message before posting and if you had, you'd have seen that your question - if there is one, you're actually just telling us what you have to do and that you can't - please be precise in your questions, is very vague.


Is it the transmitter/receiver or the encoder/decoder that you're having trouble with and what exactly is it that you're having a problem with?
What frequency should it be?
What range do you need (maybe not important for a uni-project)?
Is there any restraints on coding/decoding scheme?

If you just want to build a simple proportional R/C set, an abundance of circuits can be found on the net - coding/encoding can be done with a 4017 (plus glue parts) at each end.

A well proven set from Harry:
http://www.sm0vpo.com/use/rc-prop.htm
http://www.sm0vpo.com/use/rc_enc_02.htm

And here's another page that may be of interest:
http://jap.hu/electronic/codec.html


If you need more help, please be specific - no mind readers around here I'm afraid :)