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Old Nov 22, 2012, 04:05 AM
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Camera mount #3

An el cheapo $30 5x7" sheet of IR filter arrived from edmondoptics.com. With the naked eye, the view looks exactly the same as through a floppy disk. The problem is of all the DIY IR filters on the internets, none is made of something still in production. Floppy disks & film are no longer made.

It breaks apart like glass & hot glues on the lens easily. It seems to be common charcoal baked into acryllic plastic.

Next, the next camera mount was fully assembled & powered up with PWM. Be sure to keep the cables clear of the gears. The gears chew them up, instantly. If you accidentally turn it more than 180' & shift the center point of the pots, turn it the opposite way more than 360' until the pots are reset.

Also, discovered PWM above a certain point causes the servos to spin forever.

Another hack to use direct pot readings has given much better accuracy than an IMU. Other than motor magnets, it's hard to understand why the IMU was so inaccurate & was so hard to calibrate. The iPAD IMU gives very accurate compass headings with very little calibration. It may just be inaccurate alignment of the accelerometer & magnetometer.

The amount of energy devoted just to building up yet another camera mount brings the sensation of going in circles. This is the 3rd unique camera mount built since Summer 2011.

They only exist because someone else is paying for them, there needs to be 1 here for testing while he brings another on travels. Instead of being steps to a viable product, they are merely for demos & merely guesses as to what would work best in a demo. There's no way a $350 Servocity mount is going to be viable in a consumer toy.

If I was paying for them, there would have only been 2 camera mount buildups. 1 for traveling & 1 for development, both exactly the same cheap servo design, with custom electronics to slow down the movement, but all steps to a useful product. Servos with custom electronics are used in all Chinese toys & all game cameras. Changes would be in the servos, but not complete rebuilds.

They would drive the pots with the microcontroller voltage, but PWM the H bridges to the minimum before stalling & read the pot voltage for the angles. There should be enough downgearing to get a pretty slow speed out of a servo.

There's also a lot of progress to be had in the field of servo hacking. It might be most practical to do all the servo driving from the ARM.
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