Arduino + ultrasonic rangefinder

An el cheapo chinese rangefinder (similar to Parallax' Ping, but with a slightly different interface) hooked up to an Arduino Uno with 4D Systems' tiny dwittwe uLCD-144 as the output device. The speed of sound is temperature compensated via a thermistor. The chip in the middle and the crystal oscillator don't do anything (forgot to remove them).

Category:

Science & Technology

Tags:

• Arduino
• Uno
• Rangefinder
• uLCD-144
• 4D
• Systems
• Ultrasonic
• HC-SR04

[doN0Evil]

Nice work, I've got one of these hooked up to a temp/humidity sensor for fun.

Do you have a link to your source code for this project? I have an SGC version of this LCD and am trying to figure it out :). Did you use the arduino library the 4d site links to?

[oorcinus]

@doN0Evil Yeah, i've used this library: code.google.c o m/p/displayshield4d/

It's rather poorly documented and is missing a few crucial time-delays after some of the functions.

Here's the source: dl.dropbox.c o m/u/1702513/Distance.pde

[doN0Evil]

@oorcinus Thanks for that, I'm rather new to c style programming. I had to do some conversion to send a float to the lcd.drawstringblock() function with itoa(), which is somewhat different from what you did. It's nice to learn a new technique!

[oorcinus]

@doN0Evil Ah, yeah, converted the distance value to string manually instead of using itoa() because at some point i was playing with rounding the least significant digit to 5 cm, with decimal points etc. Left it like that in the end. itoa() basically does it the same way, so no harm done :)

[oorcinus]

@doN0Evil Oh, also, just noticed i've linked you the version of the code that also lights up a led bar graph via a shift register. In case you were wondering what's with the extra shiftOut lines.

[letsrockbaby1]

great job ;)