Super simple serial PPM converter

[airvb]

Hi there,

I'm a multiwii user (tri, quadri and hexa) and I found a way to convert N-channels outputs from any RC receiver to a serial PPM frame usable with Multiwii by using only 4-5 diodes and one resistor. It's cheap, reliable, it simplifies the connection between the receiver and the arduino (only one signal needed) and free many Arduino I/O pin.
I discribed all the stuff in my blog, only in french at this time, I'll translate it later.

http://www.airvb.fr/index.php/electroni ... lleleserie
http://www.airvb.fr/index.php/electroni ... pmmultiwii
http://www.airvb.fr/index.php/electroni ... ima6serppm

I would like to upload some software modifications too with svn. Alexandre Dubus, if you read me...

Regards,

Hervé

[flyman777]

Hi,

unfortunately that does'nt work with a Futaba R617FS, the outputs of channels 6 & 7 are overlapped and sended first in the PPM trame.

flyman777

[airvb]

You simply need to ignore those channels or use them to control servos directly. Channels 1to5 are OK for the converter. Anyway thanks for this information, I'll add it on my post.

[flyman777]

Here is a soluce to have channels 1 - 5 in PPM SUM for a R617FS Futaba.
Channel 6 is normal output.
Channel 7 is PPM SUM 1 - 5.

http://pixhawk.ethz.ch/wiki/tutorials/receiver_sum_signal

regards

flyman777

[flyman777]

Here a another link for Futaba:

http://www.mikrokopter.de/ucwiki/R607FS

flyman777

[airvb]

Don't forget that you can use super simple serial converter outside the r617 receiver (very few components) and then keep the two extra channels 6 and 7 usable.

Regards

herve

[flyman777]

Hi Hervé,

sure , I made this [url]paparazzi.enac.fr/wiki/AThttp://www.google.fr/mega328_PPM_Encoder_Board[/url] and it works well.

flyman777

[flyman777]

...... or better this http://paparazzi.enac.fr/wiki/ATmega168_PPM_Encoder_Board

flyman777

[airvb]

Yes I know that harware but it's not as simple/cheaper as 3 or 4 diodes and one resistor