Re: [Paparazzi-devel] [TWOG] CAM Port Pins

On Wed, Dec 3, 2014 at 6:13 AM, Kristofer Von Ahnen <address@hidden> wrote:

Thanks for the help, everyone! I was able to get a reading from the servo pins but unfortunately it doesn't match up with the frequency and period settings supplied in the airframe config file. I don't know if this has to do with the dc.c file's age (I am required to work with a copy of Paparazzi from years ago), my wiring, or with something I have typed incorrectly. That said, I'll be developing code to use the CAM_SW pin as per Felix's advice.

Thanks again for all your help.

Best,
~Kris

PS. Has anyone used the Paparazzi in conjunction with any of Matrix-Vision's sensors? (http://www.matrix-vision.com/)

On 12/2/14, 4:55 PM, Rolf Noellenburg wrote:

Hello Heinrich,

you have to distinguish:
AUX is a 5V switchable power supply (approx. 1 A?). I used it with success in combination with 2 diodes (reduce the voltage > 1 V) to trigger a Canon S100 / ixus90is via CHDK/USB and all involved hardware survived.
CAMSW is directly connected with the processor and therefore 3.3 V and only low current (few mA).

Both are GPIOs and on a TwoG: AUX is "POWER_SWITCH_GPIO" or "GPIOB,GPIO18" and CAMSW is "CAM_SWITCH_GPIO" or "GPIOB,GPIO22" like Felix already wrote.

Rolf

Am 02.12.2014 21:21, schrieb Prof. Dr.-Ing. Heinrich Warmers:

Hi,
The CAM Output on the TWOG is a 5V power output. This output is a power output for a 5V video camera.
If you use this signal direct usually the camera input (1.8V .. 3V) will be defect.
You can use a 5V relay with this output.

You can also use a normal servo with a micro switch or a camera module
with ppm input in combination with a servo output pin.

for paparazzi 5.03

for the block servo:
<servo name="DC_SHUTTER_SERVO" no"8" min="2000" neutral="1500" max"1000" />

for the block comand _laws:

<set servo"DC_SUTTER_SERVO" value"@DC_SHUTTER_SERVO"/>

Best regards,
Heinrich

Felix Ruess schrieb:

Or for the Twog:
<load name="digital_cam.xml">
<define name="DC_SHUTTER_GPIO" value="CAM_SWITCH_GPIO"/>
</load>
which equals
<load name="digital_cam.xml">
<define name="DC_SHUTTER_GPIO" value="GPIOB,GPIO22"/>
</load>

If you simply want to control the gpio directly in your own code:
Set the gpio up as output:
gpio_setup_output(CAM_SWITCH_GPIO);
And then set or clear the pin as disired:
gpio_set(CAM_SWITCH_GPIO);
gpio_clear(CAM_SWITCH_GPIO);

On Tue, Dec 2, 2014 at 8:03 PM, Eduardo lavratti <address@hidden <mailto:address@hidden>> wrote:

For sure you can use the CAM_SW as camera trigger.
Use an optocoupler to connect this pin to your camera.

Use something like this to control the cam_sw pin

<load name="digital_cam.xml">
<define name="DC_SHUTTER_GPIO" value="GPIOC,GPIO12"/>
</load>

> Date: Tue, 2 Dec 2014 06:52:26 -0600
> From: address@hidden
<mailto:kristofer.vonahnen@gmail.com>
> To: address@hidden <mailto:paparazzi-devel@nongnu.org>
> Subject: Re: [Paparazzi-devel] [TWOG] CAM Port Pins

>
> Is there a way to signal it On/Off? I guess voltage regulation
is the
> wrong phrase.
>
> ~Kris
>
> On 12/02/2014 02:46 AM, Rolf Noellenburg wrote:
> > Hello Kris,
> >
> > following the schematics given on the side of your link,
CamSW is on a
> > pin similar to a led switch and is not suitable to control a
servo.
> > Only the outputs SRV0 to SRV7 can drive a servo directly on a
TwoG.
> >
> > By the way: the servo pins don't adjust a voltage in order to
modify
> > the position of the servo but provide a PWM signal which is
translated
> > to a corresponding angle by the servo.
> >
> > Best regards,
> > Rolf
> >
> >
> > Am 02.12.2014 01:03, schrieb Kristofer Von Ahnen:
> >> Is it possible to regulate the voltage of the CamSW pin on
the TWOG
> >> board (http://wiki.paparazziuav.org/wiki/TWOG/v1.0) for
sending a
> >> hardware signal to a separate device? I notice in the
cam_control
> >> module that the servo pins are being used to adjust a camera's
> >> position by sending commands, but can the same be done with
the CamSW
> >> pin?
> >>
> >> Best,
> >> ~Kris
> >>
> >> _______________________________________________
> >> Paparazzi-devel mailing list
> >> address@hidden <mailto:Paparazzi-devel@nongnu.org>
> >> https://lists.nongnu.org/mailman/listinfo/paparazzi-devel
> >>
> >
> >
> > _______________________________________________
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From:	Felix Ruess
Subject:	Re: [Paparazzi-devel] [TWOG] CAM Port Pins
Date:	Wed, 3 Dec 2014 11:32:32 +0100