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Re: [Paparazzi-devel] Using a digital still image camera with Lisa/M

From: Jorn Anke
Subject: Re: [Paparazzi-devel] Using a digital still image camera with Lisa/M
Date: Tue, 26 Nov 2013 21:28:48 +0100


To conclude this thread; I now got Lisa/M to trigger my CHDK-enabled camera by using the GND- and PC12-pins on the GPIO connector. Since these pins provide 3.3V when active, I have connected an optocoupler/"booster" to raise the voltage to 5V (which is needed for activating the CHDK-trigger) between the ap and the camera.  

The settings used are:

    <load     name = "baro_sim.xml"/>
    <load     name = "gps_ubx_ucenter.xml"/>
    <load     name = "zamboni_survey.xml"/>
    <load     name = "digital_cam.xml">
    <!-- Settings for using GND and PC12 on GPIO connecton on Lisa/M, to trigger a CHDK enabled camera vith 3.3V -->
      <define name = "DC_SHUTTER_LED"      value = "12"/>
      <define name = "USE_LED_12"               value = "1"/>
      <define name = "DC_RELEASE"              value = "LED_ON"/>  <!-- zero volt on startup -->
      <define name = "DC_PUSH"                    value = "LED_OFF"/>  <!-- 3.3 volt to trigger -->
      <define name = "DC_SHUTTER_DELAY"  value = "4" unit = "quarter_second"/>
      <define name = "SENSOR_SYNC_SEND" value = "1"/>

Thanks again for help and hints Felix!

Cheers, Jorn

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