One can purchase ready-to-go ultrasonic sensors for $30 such as those from Parallax or Devantech but for max-cheapiness you may want to roll your own as this fellow from Micro Examples has done. You can make a basic one by having your already-on-board microcontroller do the timing.
Theres a lot more nice PIC projects with schems and code there, so hang out for a bit!
Have an amazing project to share? Join the SHOW-AND-TELL every Wednesday night at 7:30pm ET on Google+ Hangouts.
Join us every Wednesday night at 8pm ET for Ask an Engineer!
Learn resistor values with Mho’s Resistance or get the best electronics calculator for engineers “Circuit Playground” – Adafruit’s Apps!
Maker Business — Lessons Learned Scaling Airbnb 100X
Wearables — Start with a sketch
Electronics — When do I use X10?
Biohacking — Book Recommendation: Autonomous by Annalee Newitz
Sorry, the comment form is closed at this time.