Hi,
I've been using Mem's ServoDecode library from the old forums (http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1228137503/0) to decode a radio control PPM input. I've got it working successfully on an Arduino Duemilanove, but I'd like to run it on a Mega instead. I used the Mega version of Mem's code (post 70, http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1228137503/60), but it won't work successfully. I've attached the RC receiver to pin 49 as stated in Mem's post, but I just get completely useless data from the Mega. The code flicks in and out of ready and failsafe mode. If I detach the receiver output from pin 49, I get failsafe mode permanently, so something is sort of working. I've checked the output from the receiver with a scope, and it's fine.
Below is the output from the Mega when it's attached to the radio receiver:
The decoder is NOT_SYNCHED
Cx0= 0 Cx1= 0 Cx2= 0 Cx3= 0 Cx4= 0 Cx5= 0 Cx6= 0 Cx7= 0 Cx8= 0
The decoder is in Failsafe
Cx0= 29485 Cx1= 1313 Cx2= 2115 Cx3= 1500 Cx4= 1500 Cx5= 1500 Cx6= 1500 Cx7= 1500 Cx8= 1500
Ch1= 2202 Ch2= 2054 Ch3= 1500 Ch4= 1500 Ch5= 1500 Ch6= 1500 Ch7= 1500 Ch8= 1500
The decoder is in Failsafe
Cx0= 16436 Cx1= 1674 Cx2= 2054 Cx3= 1500 Cx4= 1500 Cx5= 1500 Cx6= 1500 Cx7= 1500 Cx8= 1500
Ch1= 1837 Ch2= 2054 Ch3= 1500 Ch4= 1500 Ch5= 1500 Ch6= 1500 Ch7= 1500 Ch8= 1500
Ch1= 1523 Ch2= 2057 Ch3= 1500 Ch4= 1500 Ch5= 1500 Ch6= 1500 Ch7= 1500 Ch8= 1500
Ch1= 2149 Ch2= 1992 Ch3= 1500 Ch4= 1500 Ch5= 1500 Ch6= 1500 Ch7= 1500 Ch8= 1500
Ch1= 1628 Ch2= 1992 Ch3= 1500 Ch4= 1500 Ch5= 1500 Ch6= 1500 Ch7= 1500 Ch8= 1500
Ch1= 876 Ch2= 2023 Ch3= 1500 Ch4= 1500 Ch5= 1500 Ch6= 1500 Ch7= 1500 Ch8= 1500
The decoder is READY
Cx0= 16259 Cx1= 1496 Cx2= 2023 Cx3= 1500 Cx4= 1500 Cx5= 1500 Cx6= 1500 Cx7= 1500 Cx8= 1500
Ch1= 2116 Ch2= 1965 Ch3= 1500 Ch4= 1500 Ch5= 1500 Ch6= 1500 Ch7= 1500 Ch8= 1500
Ch1= 1418 Ch2= 1965 Ch3= 1500 Ch4= 1500 Ch5= 1500 Ch6= 1500 Ch7= 1500 Ch8= 1500
Ch1= 842 Ch2= 1989 Ch3= 1500 Ch4= 1500 Ch5= 1500 Ch6= 1500 Ch7= 1500 Ch8= 1500
Ch1= 1740 Ch2= 1989 Ch3= 1500 Ch4= 1500 Ch5= 1500 Ch6= 1500 Ch7= 1500 Ch8= 1500
The decoder is in Failsafe
Cx0= 20134 Cx1= 1211 Cx2= 1936 Cx3= 1500 Cx4= 1500 Cx5= 1500 Cx6= 1500 Cx7= 1500 Cx8= 1500
Moving the controls on the radio transmitter has absolutely no effect on the outputs printed over serial.
If anyone has any ideas on how to get some useful data from the receiver, I'd really appreciate it.
Thanks!