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Jan 25, 2013, 01:32 AM
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Camera station day 4

After many hours of heroic soldering, the stick voltages were finally accurate enough to get the ladybird off the ground. 50% needs to be exactly 2.5V. The only way to get the ripple low enough was 10k & 1uF. The sticks now update at only 20hz, but it was the fastest a PWM using the LM324 for level conversion could do it.

The LM324 only goes up to 20khz before it just outputs 0V. It doesn't roll off. It just dies. Overriding stick voltages with the required level conversion, at a decent update rate requires a proper DAC, but overriding the stick voltages isn't considered the final solution.

So a Parallax X-band & Allegro A1302 arrived. The X-band is 1 of those widgets with no obvious purpose that someone somewhere always finds a personal need for. The mane problem with it would be detecting unwanted motion from fans, trees, cars, & the user. Sure enough, the social networks emphasize finding ways to make it more directional.

The mane problem for foot soldiers is not detecting intruders but the IED. It would require a sensor for all types of explosives hidden behind all types of materials in a 30ft range. No effective weapon against the IED has ever been found except human motivation & we all know people fight harder for freedom than individual mandates, grocery bag taxes, runaway inflation, & gun bans. Americans will never win against the armies of capitalism.

There is a bag of hall effect sensors in the apartment from magnetic levitation days. The problem was making the magnetic levitator fast enough to do more than levitate, like shake a fluid. The hall effect sensor maxed out at 20khz. The electromagnet couldn't transition fast enough.

Using a less sensitive sensor allowed heavier objects to be lifted. Using a more sensitive sensor allowed objects to be farther away. The A1302 is about the least sensitive sensor.

Nowadays, magnetic levitators are $40 items. The old levitator doesn't get any attention, anymore.
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