Sunday, 13 October 2013

Happy Birthday Box

I had to buy a present for a my friend but I didn't want to come up with something useless and out-fashion, so I thought to use my skills in electronic to build something different.
My mind made some wired ideas and I ended up with a "Happy Birthday box".

What Does It Do?
The Happy Birthday Box is a simple project where a small Arduino, LCD Screen, Buzzer and a battery are used to wish Happy Birthday with sound and text.
I had to mount a little switch to turn on the whole system, nobody wants the infinite Happy Birthday song on his house :)

I ordered these items:

  • Arduino mini ( you can use any Arduino
  • LCD Screen ( 16x2 )
  • Buzzer
  • Booster battery ( from 3.7 to 5v )
  • Battery 3.7 850mah
  • Roller switch


This is a pretty simple way to wiring the LCD screen, they are all the same, the only issue that I have seen so far is to choose the right resistor for the contrast.
I have seen tutorials tell me to use 10 ohm but in my case I couldnt use this one, I had to increase to 600 ohm to actually read something on the screen. So be careful, if you dont read what you are trying to display, is not always a wiring problems! 

I just redirect to this nice guide how to wiring your LCD:
If you want to get rid of the potentiometer, just put try to put some resistant from pin RS ( LCD ) to GND ( LCD ).
Also to light up the back light of the screen, just solder the penultimate pin to 5V and the last pin to the ground with 100 ohm ( usually is written + and - in the back ).

Very simple, just attach the ground and the other cable to one of the pin.

Very simple and "clean" ( I hope ), I haven't written the melody part, I just got from internet:

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