These will usually stay in place, but a little masking tape can provide insurance if desired.Ĭlip the alligator clips onto the pins of the Circuit Playground Express. These wires are interchangeable, but color-coding them as best you can will make connecting them to the proper pins on the Circuit Playground Express easier.Ĭonnect the male ends to the black receivers at the end of the servo’s wires. To attach a servo to the Circuit Playground Express, you’ll need alligator clip to male connector wires. This signal wire is the one telling the servo what degree to move to, or what direction and speed to run at. The body of a servo has three wires coming out: brown or black for the negative, red for positive (these complete the electrical circuit) and a white or yellow wire that carries the signal. You can also buy wheels to attach to servo motors, and those usually will require screws. See the Maker Tools and Techniques chapter for more on hot gluing servo horns. However, if your project will put some stress on the horn, use the smallest screw to hold it. In many cases, the horn will stay put on the servo without needing a screw.
In either case, servos will come with little attachment arms called horns, as well as tiny screws to hold the horns on. These will spin in either direction or will stop.
There are also continuous rotation servos. You might program it to start at 70 degrees, pause for 2 seconds, the move to 110 degrees, pause for 2 seconds, and then repeat. The most common is a standard servo, and it can rotate an arm from 0-180 degrees. There are two main kinds of servo motors.
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