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Apr 06, 2014, 03:48 AM
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Open loop autopilot



So the motor wires had to be routed away from the sonar transformer. There aren't many places for those wires. With that out of the way, the Syma X3 worked perfectly. It was very stable, performing the autonomous open loop maneuvers exactly as hoped.

Without any active control besides altitude, it took several takes to get a maneuver to work. It was more successful in the packed apartment than the large room. The apartment might break up the air currents more. 1 key seems to be making it as light as possible.

Miniaturization beyond a point still costs you. There is a weight advantage to using $5 of ceramic caps instead of $0.35 of electrolytic.

Ceramic 100uF 6.3v * 5: 0.3g
Electrolytic 470uF 6.3v: 0.6g

But the weight of the soldering for the ceramics would make them heavier. Digikey has a 220uF 6.3 for $1.65. 2 of those would be lighter than the electrolytic.


What about using 2 batteries + regulator instead of a boost converter to get 5V 300mA?

Extra 4.2V 260mAh: >7.5g
boost converter: 3.1g

So all the work designing the boost converter was worth it. The choice in motor wire makes a difference, too.

Ribbon cable: 1.6g
wrapping wire: 0.5g

Didn't notice any reduction in power from using wrapping wire.
Last edited by Jack Crossfire; Apr 07, 2014 at 07:13 PM.
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