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Originally Posted by monalin
Please feel free to correct me if i'm wrong, but you do not need the 12v battery to run the camra. The PWMs run from the backup battery. Like others have said this runs down the battery very very fast. Our solution to this was not to plug it up to an external power supply at the same voltage but we just switched the pwm cable connecting the camra to the robot controller to the Digital In OR the Analog In. This seemed to fix the problem with the battery running down because instead of using the backup battery it will get its power from the 12v.
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Yes, I agree...you shouldn't need the 12V battery for the camera. However, doesn't the analog and digital I/Os provide only 5V and GND? The pwm outputs provide about 7V. So would the 5V be enough to run the camera? I am asking this because doesn't the camera have an on board 5V regulator which needs a voltage greater than 5V in order for the camera to work?
According to the camera specs on IFI's website, the nominal operating voltage is 7.2V and the acceptable range is 5.2V to 8.6V. So I think 5V is cutting it a little close.