Archive for December, 2011

LED Display Over Bluetooth With Android

December 9, 2011 13 comments

Old Clock Redux

bluetooth moduleI came across this neat bluetooth module called HC-06. It can be found as cheap as $6 on ebay, and gives you convenient UART access to bluetooth wireless capabilities.

My 3yr old has this home-made LED clock in his room. I thought it was time for an upgrade since the clock was very minimalistic. Its only function was to keep track of time and display it on the LED panel. And considering it was my first “completed” project with avr (atmega168), I thought I could make it better this time around.

I wanted to make use of bluetooth capability somehow, and thought it would be neat to send a text message to the display. In addition, I decided change up a few things:

  • receive bluetooth text message up to 64 chars and scroll it across the panel
  • set the time via bluetooth
  • consolidate 2 push buttons into 1 for manual time adjustment
  • make some noise with the piezo I put in there
The upgrade seems to have worked out nicely. I can send messages to it from my Android phone or from a Linux PC with bluetooth dongle attached. I used iteadstudio’s bluetooth assistant app to send text to the display.
A Simple Demonstration
Again, the source code is available at:
Categories: uC and Electronics