problem.md

Make a remote control robot arm

Use a rotary potentiometer (pot) to control the position of a servo.

• Attach a potentiometer to pin A2
• Attach a servo to pin 9
• Have the servo rotate as the potentiometer is turned

Circuit diagram

         Servo
         .---.
         | | |
       -===+===-
         | | |
         |   |
         '---'
         | | |
         | | |
         | | ------------------o  Pin 9
         | |
         | ----------------.---o  +5
         |                 |
         |  Potentiometer  |
GND  o---.------/\/\/------.
                   ^
                   |
                   |
 A2  o--------------

Components

• Potentiometer - http://node-ardx.org/electronics-primer#pot

Produces a variable resistance dependant on the angular position of the shaft.

Docs

• Sensor - https://github.com/rwaldron/johnny-five/wiki/Sensor

Hints

• A potentiometer is another use case for the Sensor object...
• A pot produces input values between 0 and 1023.
• A servo can typically be moved between 0 and 179 degrees.

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