Difference between revisions of "ATmega328 PPM Encoder Board"
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Revision as of 20:02, 17 February 2011
Thanks to Chris we have a way to use virtually any RC receiver with Paparazzi without any modifications to the receiver.
This board plugs into the servo output ports on a R/C receiver and encodes them into a single PPM pulse suitable for the paparazzi autopilot. It is also possible to remap channels by changing the connection between the receiver and the encoder. Want Tx ch5 to be output on ch7 of the ppm stream? Just connect the Ch5 signal from the receiver to the Ch7 input on the encoder.
Note: see the ATmega168_PPM_Encoder_Board page for the more recent hardware version. Wiki refactor in progress, these pages will be merged.
Programming the PPM encoder
Programming the board can easily be accomplished using an AVR ISP (in-serial programming) programmer. These are inexpensive and can be found many places online. Once you have the ISP connected to the PPM encoder, simply use avrdude with the following command:
avrdude -p atmega168 -P <Insert port here> -c <Insert ISP type here> -U lfuse:w:0b00100010:m -U efuse:w:0b111:m -U flash:w:servo2ppm+bootloader.hex
Fuse settings shown above may give unpredictable results and strange behaviour, depending on device and crystal.
So the better settings are:
avrdude -p atmega168 -P <Insert port here> -c <Insert ISP type here> -U lfuse:w:0b11110111:m -U efuse:w:0b111:m hfuse:w:0b11011001:m -U flash:w:servo2ppm+bootloader.hex
For ATmega328P set the fuse bytes as shown next:
avrdude -p m328p -P <Insert port here> -c <Insert ISP type here> -U lfuse:w:0b11110111:m -U efuse:w:0b111:m hfuse:w:0b11011001:m -U flash:w:ppm_encoder_v4_3+bootloader_16Mhz.hex
If you use 328P and a PonyProg-Cable for COM or a Mikrokopter SerCon, type the following: (replace COM1 with actual COM-port):
avrdude -p m328p -P COM1 -c ponyser -U lfuse:w:0b11110111:m -U efuse:w:0b111:m hfuse:w:0b11011001:m -U flash:w:ppm_encoder_v4_3+bootloader_16Mhz.hex
- Link to firmware file: [PPM Encoder Eagle and latest (4.3 Feb 2010) firmware (zip)]
Gerber & Drill files