Positioning a servo motor with the Raspberry Pi

To position a servo, we need to set up a servo horn to see it move, and then plug it into the motor controller board. A servo horn is a small collar with one or more arms, usually used to connect the servo spindle/axle to a mechanism they move. Figure 10.5 shows how to attach a horn to a servo:

Figure 10.5 – Fitting a servo horn

The images in Figure 10.5 show how to fit a servo horn. Perform the following steps:

1. Servo motors usually come with small bags of hardware, containing a few different horn types and screws to attach them to the servo and the parts you want them to move.
2. Use the very short small screws for this, as the longer screws can break the servo.
3. Screw a one-armed servo horn into the servo. The long collar of the horn fits over the servo's output spindle.
4. The servo should now look like this. Don't over-tighten the collar screw, as you may need to loosen it...