please dont rip this site

Pulse Position Modulation

A subset of Pulse Width Modulation used to control the position of RC Servos

Paul B. Webster says:

Pulse Position Modulation:

... The actual transmitted version is a series of pulses of a given width (somewhat less than 1 ms), the *position* of each of which in respect to the previous defines the length of the pulse to a given channel.

More specifically, the 1 to 2 ms channel pulse is the time between the start of one pulse in the transmitted sequence and start of the next. The minimum pulse width of 1 ms corresponds to the transmitted signal going on for 0.5 ms, then off for 0.5 ms, then on again for the next pulse. Of course, where FM is used, these are two frequency states instead.

The length of the series of pulses is of course the sum of the individual output pulse lengths and may vary over a wide (2:1) range. The "rest" time before the next series is used for synchronisation.

What is so elegant is that a single 4017 CMOS chip, with a resistor and capacitor to reset for each series of pulses, neatly performs the decoding function to the individual servo outputs.

Comments:


file: /Techref/io/servo/ppm.htm, 1KB, , updated: 2016/4/27 08:44, local time: 2024/11/5 09:08,
TOP NEW HELP FIND: 
3.239.97.34:LOG IN
©2024 PLEASE DON'T RIP! THIS SITE CLOSES OCT 28, 2024 SO LONG AND THANKS FOR ALL THE FISH!

 ©2024 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?
Please DO link to this page! Digg it! / MAKE!

<A HREF="http://techref.massmind.org/techref/io/servo/ppm.htm"> Pulse Position Modulation</A>

After you find an appropriate page, you are invited to your to this massmind site! (posts will be visible only to you before review) Just type a nice message (short messages are blocked as spam) in the box and press the Post button. (HTML welcomed, but not the <A tag: Instead, use the link box to link to another page. A tutorial is available Members can login to post directly, become page editors, and be credited for their posts.


Link? Put it here: 
if you want a response, please enter your email address: 
Attn spammers: All posts are reviewed before being made visible to anyone other than the poster.
Did you find what you needed?

 

Welcome to massmind.org!

 

Welcome to techref.massmind.org!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  .