How to control the camera

Camera

The (optional) camera is a OmniVision OV9655 1.3 Mpix camera module. It is connected to I2C2 and powered by VAUX3 (set to 2.5V). Two GPIOs can control the camera: Reset (GPIO98, active 1) and Powerdown (GPIO165, active 0).

This all has been integrated into the ov9655 and gta04_cam drivers so that you just have to open and use

/dev/video0

grabbing a still picture (at 16 colors)

streamer -c /dev/video0 -b 16 -o outfile.jpeg

grabbing video (at 3 fps and 10 minutes duration)

streamer -q -c /dev/video0 -f rgb24 -r 3 -t 00:10:00 -o /home/jhs/outfile.avi 

showing through mplayer on X11

mplayer tv:// -tv driver=v4l2:width=640:height=480:device=/dev/video0:fps=12 -vo x11
mplayer tv:// -tv driver=v4l2:width=1280:height=720:device=/dev/video0:fps=4 -vo x11

previewing video on the OMAP DSS

there are drivers, but we don't know how they work

Torch/Flash (optional)

• chip is on board
• not tested
• no recommended LED available
• no driver ported

Installation

You need to install a white LED and drill a hole into the case.

Note: either the CPU or the Camera can trigger a strobe.

Ambient light sensor (optional)

There is an optional ambient light sensor. This is sort of a low power, 1 pixel B/W camera.

Installation

A recommended photo transistor is the Vishay TEPT4400. The long end should be soldered to the pin nearer to ???? You also need to drill a hole into the case.

Driver

The TSC2007 driver also reads the ambient light level (range 0 ... 4095) and presents it as the second last field of

cat /sys/bus/i2c/drivers/tsc2007/2-0048/values