EESage.com

07 Oct '12, 2am

And @sparkfun gives a nice overview of my Robotics book on their New Product Friday video: Yay!

These ‘continuous servos’ are positional servos hacked to have their feedback loop disconnected, and their mechanical limiters removed. They are definitely not very accurate; maybe not as accurate as a decent DC motor and controller pair, certainly not as accurate as a closed loop system with a motion encoder. For a but more background, we need to look at the original purpose of these servos. the unhacked servos are designed to move towards a specified position with a speed that is proportionate to how far away they are from that position at the moment, slowing and stopping as they arrive at the specified position. The position is communicated as a pulse width signal that encodes a reference voltage which is compared against the value of a small voltage divider/potentiometer inside the servo. The shaft of this potentiometer is directly connected to the output shaft of the ...

Full article: http://www.sparkfun.com/news/973

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