Re: [Paparazzi-devel] Lisa/M questions

[Eric Parsonage]

Hi Chris 


> I emailed Jobey this question, Piotr replied that only the Spectrum RC
> is currently implemented (not PPM). He hinted it would be possible
> port the PPM stuff to Lisa/M. I suppose if you aren't using a pair of
> spectrum satelites there would be two UARTs going spare, no idea if
> some of that IO could be re-purposed for PPM input though.

I wrote the spektrum parser so can give you a definite answer on this. YES the 
UART pins can be used as general purpose i/o and could be used for ppm input. I 
don’t think it would take that much effort to re-map to use one of those pins.

Why would you want to though ? The Spektrum satellites can be purchased 
individually for less than $35 for a genuine Spektrum satellite receiver and 
the clone receivers can be had for $15

Quality PPM receivers are not any cheaper than this and hacking a receiver to 
get ppm out adds risk whereas the Spektrums  satellites need no modification. 
If you where not thinking of hacking a PPM receiver but instead using an 
encoder board then you end up with the ugliest wiring ever.

I am really interested in hearing why it is better for you to use PPM it might 
hep with future development.

Eric


> 
> I didn't ask about open source hardware, but I did wonder :)
> 
> Chris Gough
> 
> On Tue, Jun 7, 2011 at 9:51 PM, Christoph Niemann
> <address@hidden> wrote:
>> Hi community,
>> 
>> having a look at the wiki-site of the Lisa/M I was a little bit confused. Is
>> the only possible RC Spektrum (and JR and Hobbyking)? Or is it also possible
>> to use classic PPM and JETI 2.4Ghz?
>> The other thing, that would matter in the process of deciding, whether to
>> purchase it or not is, will it be OpenSource or not?
>> 
>> Thanks for your answers
>> 
>> Christoph
>> 
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> 
> 
> 
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