Servo Actuator

A servo is a small strong motor that have limits. Usually they can be turned 180 degrees.

Software

You can download the Arduino sketch ​here

Wire things up

Follow the instructions in ConnectingRadioModule to connect radio module.

The servo has 3 wires. Connect red wire to +5V of the Arduino board. Brown or black to to GND.
Connect the last [mine was orange colored] wire to digital pin 3 of the Arduino board.

Relays can use much power and should probably be powered separately. I has some problems with when servo reached its limit (and i tried to move it further). This was too heavy [consumed too much power] for the Arduino so it reset itself. You can fine-tune the boundaries of the servo by modifying the SERVO_MIN and SERVO_MAX defines.

​https://www.youtube.com/watch?v=djnqEgbe8BM

Hardware - Purchase guide

To build this sensor you'll need one arduino + radio specified in the base kit found here:
http://code.mios.com/trac/mios_arduino-sensor/wiki/WikiStart#Buyingguide

With the following additional parts:
1x ​Servo Module

TOTAL SENSOR PRICE: $7.6 (arduino + radio) + $6.5 (servo module) = $14.1