PPM SUM RX with Arduino Mega / Flyduino [pin change]

[warthox]

hi,

ppm sum signal input is on pin19 for the mega. but this pin is used on the flyduino.
how do i have to change the code to be able to connect the ppm sum signal to THR pin [A8] like with the pro mini?
i looked at the code [1preter7] but as im not a coder its not really clear what to do.

any suggestions?

regards markus

[miniquad]

Hi Markus,
Looking at the code, it seems to me that you will need to modify the following line for the pin change:

line 242: #define PPM_PIN_INTERRUPT attachInterrupt(4, rxInt, RISING); //PIN 19

Here the number 4 indicates which pin of the arduino mega is used to capture the ppm signals. To change this, just find the corresponding pin number for THR pin [A8] as you mentioned and replace 4 with that. But this is what I understand from looking at the code, nothing tested or confirmed.

[ben123]

Hi Markus!

I had a similar question for the Pro Mini. Finally found the info I was looking for here :

http://www.arduino.cc/en/Reference/AttachInterrupt

It seems that the Mega chip has 6 pins that are capable of an external interrupt:

Most Arduino boards have two external interrupts: numbers 0 (on digital pin 2) and 1 (on digital pin 3). The Arduino Mega has an additional four: numbers 2 (pin 21), 3 (pin 20), 4 (pin 19), and 5 (pin 18).

So I think you can use any of those pins as long as they're not being used for something else and are broken out

Ben.

[Loosi]

Hi !

Someone got PPM working with the Flyduino Mega board?

Greetings
Daniel

[Siberian]

Hi;

works with receiver connected to Serial 1...

Greetz

Peter

[Loosi]

Thanks, i have seen it on the schematic, i thought it is only for the Spektrum that works serial or something like this.
Working perfect with a standard ppm receiver. Just connect the PPM signal to RX on Serial 1

[monkey]

Thanks, i have seen it on the schematic, i thought it is only for the Spektrum that works serial or something like this.
Working perfect with a standard ppm receiver. Just connect the PPM signal to RX on Serial 1

Actually now in the Dev build you can use the throttle channel or A8 with PPM,

Check out:
http://www.multiwii.com/forum/viewtopic.php?f=8&t=2868

I just loaded it up and bench tested it today, works great.

So we no longer have to use a Serial Port for PPM sum on a mega board. I am using a Flyduino Mega myself but this code will work on any mega board.