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Additional info for Circuit Cellar July 2010
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After more digging in the iWRAP user guide, it became apparent that there had to be a CALL command to open the Bluetooth link between the phone and the WT32. Evidently, the act of pairing just happened to also make the HFP link active, but it was not a permanently active link. In fact, even after a CALL was issued, if either the phone or the WT32 was rebooted or moved out of range, the Bluetooth link dropped and was not automatically reestablished. I finally found a solution in the iWRAP user guide: the iWRAP AUTOCALL command.
A Point Grey Chameleon machine vision camera is used for the compactness. An inexpensive lens is used to get a 150° field of view. July 2010 – Issue 240 MOTOR CONTROL 46 The simple servomotor operates by providing either a signal or protocol specific to the motor which translates to the output shaft position. Typical hobby-style servomotors have a single-input pin that senses the high part of a PWM signal. If the PWM’s high time changes, the mechanical output angle of the motor changes accordingly.