Re: [Paparazzi-devel] YAPA 2

[Christophe De Wagter]

Thanks for the feedback.

Sorry about the lack of 5V pins. Yapa initially was a board to interface with the XSens imu, and only gradually became a TWOG alternative. As the board is only 2-layer, and all 5V were at the top, interference-wise it was not good to have 5V traces split the ground plane so they were not added. In 4-layer it would be easy.

We faced the lack of 5V pins too. E.g. In http://paparazzi.enac.fr/wiki/File:Yapa_v2_molex_gps.jpg the pin with the red wire was cut loose and connected with a wire on the bottom of the PCB to the 5V.

1) you can re-use the ADC's initially meant for thermopile for anything else. No problem. Just make sure you do not apply > 3.3 Volt. If you need more, the C31-R25 and C32-R29, originally configured as low-pass filters can be reconfigured as voltage deviders. E.g. C31=1k and R25=3k3 -> input can go up to (3k3+1k)/1k * 3.3V = 14 volts..

2) yapa 2.0 supports all 10 servo pulses using the 4017 driver for LPC21: https://github.com/paparazzi/paparazzi/blob/v3.9/sw/airborne/arch/lpc21/servos_4017_hw.h

however: it will not generate PWM on all channels by default as it will use the NB_CHANNELS define. So if you define less servo's in your airframe file I think the highest servo channel number will determine the amount of pulses sent.

-Christophe 

On Fri, Jul 6, 2012 at 6:49 PM, Chris <address@hidden> wrote:

I just installed my first YAPA 2 autopilot and it took my no more than 5 minutes to setup
all peripherals.
I don't know why but i like this design very much, everything is pluggable and the mounting holes
are very helpful.
One thing that can be improved is to have a couple more outputs from the onboard 5v regulator.
It has the Paparazzi design GPS, the BMP085 barometer, the sparkfun 6dof IMU (ppzuav compatible)
although i do think that the ppzuav IMU was better because of the magnetometer,
a current and voltage sensor (i use 10 lipo cells), the ppm encoder and some other stuff.
One thing i noticed is that the setup is so much easier than say one year ago.
I do have a couple questions though:

1) can i use the IR adc channels for other uses?
    I do use them for current and voltage sensing and they seem to work ok
    but i haven't actually fly the plane yet.

2) Does the autopilot code support 10 rc channels, the code looks like it can but i am not sure.

Chris





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