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Jingle bells playing Christmas tree

Posted on Thursday, December 20th, 2012 in Holiday by DP

Here’s a fun project in the Christmas spirit. It’s a “Jingle bells” playing card, with the specific notes being signaled via LEDs as they are being played.

We have 9 control lines for the LEDs and 1 line for the speaker signal. We want the device to start playing if a push button is pressed and when done playing the device shall be switch off automatically. For this, we use a pushbutton in parallel to a relay switch which is controller by the ATmega. If someone presses the push button then the ATmega starts running and holds the relay closed.

Via Hacked Gadgets.

This entry was posted on Thursday, December 20th, 2012 at 11:00 am and is filed under Holiday. You can follow any responses to this entry through the RSS 2.0 feed. You can skip to the end and leave a response. Pinging is currently not allowed.

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