22 replies to this topic

[fertito]

hello,
made a try today on PPM out, using one timer even if I know what it'll be (glitchs).

I would like a stm32 board able to use uavtalk for my future android remote control, don't be afraid with the wires jungle, it is really working fine like that

I plugged a custom CopterControl board with a ppm ouptut that goes trought a frsky transmitter, and binded the fisrt axis to the pitch movement of the CopterControl :


View on Vimeo

I'll make another try with 2 pwms, but I didn't figured now how...

[Kenn Sebesta]

I got PPM out working on an Arduino with one and a half timers. It wound up working perfectly. I'm betting you'll get there yet.

Is this so that you can have a full six-axis device on the ground that can transmit info to another mechanism, like a head tracker?

[fertito]

I have a microchip card that is doing that with only 1 timer
but it is not doing anything left until it has free-time.(at the end of the 6th channel)...

I'm looking over synchronised pwms or maybe 1 pwm and 1 timer, not sure here...

Is this so that you can have a full six-axis device on the ground that can transmit info to another mechanism, like a head tracker?

better than that, a box that can connect in many way : on my current android radio :

I can connect an andoid device via an IOIO, a computer via usb cdc, another generic usart and a radio in ppm and specify for each channel (8 in total) which device to connect. this way I added 2 more dual axis stick plugged to the IOIO so that I can use my gimbal while flying with the radio in ppm mode

And I'm taking the telemetry back to the IOIO (android) or usb (copmputer).

But I had a little problem of glitch with the android input (not with the other) certainly due to the latency of the adb interface.
And because I didn't set up the mixer function yet, i think it is a good idea to not make the thinks twice, so I'll like to use OP modules that have nearly all what I need and even better

[fertito]

ok, found everithing I need int the ppm.c of the pipextreme
time to adapt....

[fertito]

ouch, my head...
was ppm out working on pipextreme?

[Brian]

I'm not sure if it was tested.

This is the only link that I found discussing it: http://forums.openpi...-ppm-pipxtreme/

[fertito]

ok, will start by trying the code, if it works I'll look on implementing in the PIOS architecture.
Now I'm a point where I don't know how to make it work... without a dedicated device...

[fertito]

Hello,
I finnaly have a nice PPM output that looks (on the oscilloscope) solid, will make a try this evening with a transmiter.
Had to make some tricky modification in the pios_tim.c but it seems to run.
I'll take some time trying to integrate this nicely in the CC3D architecture if it works.

[fertito]

did the test, the signal is nice and solid, no more glitches
will clean it and commit

[dankers]

Thank you!

Commit it to a branch and then please start a review: http://git.openpilot.org

Add, peabody124, Stac, OSNWT, pt_dreamer, werner, brain and alessio to the review.

[Hyper]

Dave, did you mean "brian" there?

[Kenn Sebesta]

did the test, the signal is nice and solid, no more glitches
will clean it and commit

Fun! These kind of hardware things always seem like black magic. I bet when I see the commit, it'll only be two lines long.

[dankers]

Dave, did you mean "brian" there?

No, we call him brain

Guess that was a real Freudian slip, he is a very smart guy.

[Adverse Effects]

i would love to make some custom tablet holders (with sticks) but i carnt seem to find the joystick modules anywhere and i carnt bring my self to dismantling a working TX for them i have been looking on and off for over a year

[fertito]

Fun! These kind of hardware things always seem like black magic. I bet when I see the commit, it'll only be two lines long.

You have no idea on how right you are...
in fact I don't really know how it started working, but it does...

i would love to make some custom tablet holders (with sticks) but i carnt seem to find the joystick modules anywhere and i carnt bring my self to dismantling a working TX for them i have been looking on and off for over a year

wrong post here? no?
I found Hitech RC gimbals once, but nearly the price of the HK transmitter... and believe me you can't do much with these TX, but as spare parts they rocks!

[fertito]

hello... again
would like to have a guideline here, when used as PPM output should I remove all the other servo output or should I let them for other things?

what UAVO definition should I modify? ActuatorSettings or HWsettings?

Edited by fertito, 14 August 2012 - 08:08 AM.

[Kenn Sebesta]

hello... again
would like to have a guideline here, when used as PPM output should I remove all the other servo output or should I let them for other things?

Can we have both? I can see use cases for other things, such as sonar.

what UAVO definition should I modify? ActuatorSettings or HWsettings?

HWSettings

[fertito]

yes, we certainly can have both.

in this case, it is better to mod actuatorsetting to be able to choose wich channel is going on wich servo/ppm channel...

trying to rewrite the code with a callback to avoid modifying pios_tim.c

[Kenn Sebesta]

in this case, it is better to mod actuatorsetting to be able to choose which channel is going on which servo/ppm channel...

That's an interesting point. Right now, actuator acts on channel names, such as throttle, roll, etc... What you're talking about is routing the channels beforehand. Hmm... I should think this is relatively straightforward, but in this case I think that actuatorsetting needs to be where you set the routed channels, adn in HWSettings is where you set that we have PPM output.

[fertito]

Ok, will do this later
I cleaned the code, there is more than 2 lines of code, sorry...
now everything look a little cleaner than what I made before, and there is no need to touch at pios_tim.c, everything was made in the pios_ppm.c file, few lines in Pios_board.c and 2 line in the Actuator.c .
Seems to run well, pretty proud of this

edit : now I use a callback for switching between channels.
sorry kenn, I didn't documented my code at all, will try to make this evening (if I'm not going to fly )

Edited by fertito, 14 August 2012 - 11:29 AM.