I'm fine with software programming, but new to electronics.
I'm trying to control the Futaba S3003 servo in my RC car using RPi. The spec is here:
I connected 4x 1.5V AA batteries in series to power the servo. The servo made a little jitter then does nothing which is what I expect, then this is where it gets weird.
As soon as I connect the servo's control wire to the Pi, the servo steers the wheels of the RC car full lock to the left. This is before I start my servo software. I used a multi meter to confirm the GPIO pin wasn't sending any voltage, I even connected the control wire to pin 6 of the Pi (GND) and it does the same thing.
I start the servo software which does a softServoWrite(1, 1500), and it doesn't make any difference. The servo continues to steer the wheels full lock to the left.
So, as far as I can tell, the Pi is sending zero voltage to the control wire, so why is it causing the servo to move? As soon as I disconnect the control wire, the servo stops moving.