do you need control in the form of a servo? as most pan tilt units only have on off motor control and they stay were you put them using no power
do you need control in the form of a servo? as most pan tilt units only have on off motor control and they stay were you put them using no power
I was thinking in terms of using only one revolution of a multi turn winch servo. In order to have full deflection of the transmitter stick equal only one revolution of the servo the input to the PIC would be translated to the necessary output pulses to the servo. For example say for the servo given pulse width from 1 to 2 ms = 7 revolutions so one revolution would be from 1 to 1.14 ms (or any similar range within 1~2ms) So for 1ms input the PIC output would be
1ms and for 2ms input, output would be 1.14 ms. Intermediate values would be proportionate. This is just a suggestion of the logic. I have only a brushing familiarity with the process.
John Hawkins - From Canada's Atlantic Coast
I had this same problem with rotating gun turrets on a model warship. The solution I ended up using was to mount an arm on the servo with fishing line or similar tied to the ends to the ends, the loop formed is wound on a drum, the camera mounted on the drum, this has the advantage of being light. Another solution is to use a 3:1 or 4:1 gear ratio the larger gear mounted on the servo, but this requires much more precision, or maybe a large pulley on the servo driving a small pulley on the camera's rotation shaft.
Regards
Chris
I don't know about modern servo amps, but the amps I built for my Royal Classic system kit DID work that way. The servos could be modified to sweep up to 250 degrees by CHANGING the values of the fixed resistors on either side of the pot ! ! ! ! !
David
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