Building the Hardware
This project builds on previous work that I found on the internet. There is a very good tutorial by AptPupil that will get you an operating ultrasonic spotter short of SmartThings. Here is the link to build the Parking Spotter:
The tutorial uses a home-built controller (freeduino), but I used an Arduino Uno R3. It was an easy change. It also uses a 4 pin SRF04 Ultrasonic Ranging Sensor. I used a “Parallax Ping 3 pin Ultrasonic Sensor”. So I used the hardware instructions from AptPupil and the Arduino sketch from www.arduino.cc/en/Tutorial/Ping .
Once you get the spotter working. Go to the project section “Integrating SmartThings” (page not done yet).
Here’s a pic of the finished product installed in my garage. [Photo not found]