Show Posts
Pages: [1]
1  Using Arduino / Project Guidance / Re: PPM decoder with failsafe on: December 05, 2012, 01:55:32 pm
I dont need to analyze any data I just needed a decoder with failsafe I can set; and your solution is the only one in the world at the moment that does that thing in specific way and can be set for any channel seperately to a different value;
For now I will try with 4017 and this failsafe should do the job: it has 3 modes and can be preset to any servo positioon with a click of a button!
2  Using Arduino / Project Guidance / Re: PPM decoder with failsafe on: December 05, 2012, 05:02:26 am
Hello That is also good idea but few drawbacks:
This component is very old and impossible to find.
Also is this reliable enough?
Will the failsafe detect correctly when to activate itself? What happens where there is no PPM at all or PPM with wrong pulses coming into this decoder? after that how will the decoder affect the PWM output for the servo channel so that the failsafe can detect this and activate?

Also what is the resolution of that decoder? Is it 10 bit?
And last but not least: whats the difference between CD 4017 and CD4020? I read the datasheed and it comes out that 4017 is 10 channel and 4020 is 8 channel.
3  Using Arduino / Project Guidance / Re: PPM decoder with failsafe on: December 04, 2012, 04:04:49 pm
holmes4 you information is not correct I am talking about proportional RC systems used in RC models not on/off controls used in cheapo chinese toys.
But that Is not my case. I am using other RF modules and I only need the PPM decoder. There is no PPM in cheap chinese toys.
Best regards!
4  Using Arduino / Project Guidance / Re: PPM decoder with failsafe on: December 04, 2012, 02:51:01 pm
Hello and thank you for your detailed reply. As I said I just have RF modules that have no PPM decoders, PPM encoder is not problem because any RC transmitter has PPM output, I just connect it to TX module.
But on the receiver side is the problem I have RX module that outputs PPM signal and I have to decode it so the servos of the airplane can work. I have been searching a lot and finally found what I need: PPM decoder that has at least 8 channels and has programmable failsafe on at least 1 channel (that is made by user "mem")
On every modern rc system even cheap chinese receivers that cost around 10 USD the PPM decoding is done with atmel as far a I know.
So I thought this is the best
it has USB connection so I don't have to buy any programmers. Where I live buying only the atmega will cost as this whole board or more.
So yes I only need PPM decoder that has at least 8 channels and Failsafe. Without this I can't control the model.
If it is possible to decode more than 8 channels it will be great, because with more channels you can control more things for example lights and other misc stuff.
5  Using Arduino / Project Guidance / PPM decoder with failsafe on: December 04, 2012, 12:35:59 pm
Hello. I have been searching long time for such thing PPM decoder for RC systems that has at least 8 channels and 10 bit resolution, has failsafe that can be preset on at at least 1 channel. This means that when the decoder stops receiving PPM signal from RF modules or receives bad signal it should activate the failsafe and move the servo of this specific channel to a specific position.
The thread I found:,22140.0.html
I think this code does everything I could wish for!
Now for the hardware I needed something small because I will put it in a RC plane and  it should not take too much space; On the other hand I did not wanted to buy any other hardware that I will use only once or twice and then leave to collect dust on the shelf.
After some searching I found this board, with USB connection:

And my first question for this piece of hardware: is it possible to program it using the USB connection by connecting it to the PC?
If that is "yes" then I guess it makes no sense trying to build my own board that is programable through USB.

Thank you very much in advance!
Pages: [1]