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Old 11-19-2016, 03:33 PM   #35 (permalink)
LittleBlackDuck
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Quote:
Originally Posted by Daox View Post
Does the servo use power to hold position, or only when it gets pushed out of position? I'll have to hook up an ammeter and see how its been programmed.
Most servos have plain spur gears but the ratio is quite high, resulting in a significant torque required to move them without power. There is no power used by the servo motor when in position, but the electronics uses a small amount. The pulse position tells the servo the desired position, which is compared to the internal position and the potor actuated till they match. If it is moved out of position it will resist and try to move back.

For closing after ignition off you will need a really big capacitor to provide enough power to close the grille, probably in excess of 100,000uF. You can use a resistive divider and an analog input to monitor the input voltage before the regulator to detect power off.

Simon
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