Propeller directly controlling a Servo

william chan

Hi,

I need to connect a Prop directly to a Parallax Standard Servo Motor.

1. Can a propeller pin (at 3.3v) directly (via 2k resistor) send pulses to a servo motor powered by 6volts.
Will the pulse voltage be high enough for the servo?
2. Will some stray current from the 6v source stray into the IO pin and kill the Prop?
3. If I disconnect only the negative wire of the servo motor from the ground,
will the control wire start to leak current?


Thanks.

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Leon

What does the servo data sheet say about the input signal?

Leon

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Rayman

take a look at the proto board schematic... It has a direct interface for servos...

Mike Green

1) Should work. The servo input is supposed to be a "TTL level" logic input and the Propeller's output will satisfy that. That said, it depends on how the servo is manufactured. Look at the datasheet for the servo.
2) Not supposed to happen. That said, things break and, in breaking, may damage other things. The 1K (or 2K) resistor should protect against that.
3) Maybe. It depends on the circuitry inside the servo.