[[Image(distVera.png, align=right, width=300px)]] = Distance sensor (HC-SR04) = == Software == You can download the Arduino sketch [[https://github.com/mysensors/Arduino/tree/master/libraries/MySensors/examples/DistanceSensor|here]].\\ Adjust the measure interval by updating SLEEP_TIME define at the top of the sketch file. This sensor requires you to upload the following device files to Vera as well.\\ http://code.mios.com/git_public/mios/arduino-sensor.git/tree/HEAD:/VeraArduino/Vera/distance?js=1\\ D_DistanceSensor1.xml\\ D_DistanceSensor1.json\\ S_DistanceSensor1.xml\\ == Wire things up == Follow the instructions in ConnectingRadioModule to connect radio module. The HC-SR04 sends out short ultrasonic pulses and registers when the sound echo comes back. By knowing the speed of sound you can easily calculate the distance. To connect the HC-SR04 sensor to the Arduino board follow these instructions:\\ Connect VCC of the HC-SR04 sensor to +5V\\ Connect Echo to digital pin 5 of the Arduino board\\ Connect Trig to digital pin 6 of the Arduino board\\ Connect GND to Arduino ground\\ == 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 [[http://rover.ebay.com/rover/1/711-53200-19255-0/1?icep_ff3=2&pub=5575069610&toolid=10001&campid=5337426682&customid=&icep_item=281090552883&ipn=psmain&icep_vectorid=229466&kwid=902099&mtid=824&kw=lg|HC-SR04 Distance Sensor]]\\ TOTAL SENSOR PRICE: $7.6 (arduino + radio) + $2.42 (HC-SR04) = '''$10''' [[Image(dist.jpg, width=500px)]]