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Topic: SOUND BOARD (Read 256 times) previous topic - next topic

PRO4674


 HI ALL IM NEW HERE TO THIS FORUM--EXCUSE THE CAPS  IM HALF BLIND --I AM LOOKING FOR A SOUND BOARD THAT I CAN USE TO ACTIVATE A RELAY THAT IN TURN WILL TURN ON A PILLOW SHAKER FOR A HEARING IMPAIRED VET WHO IS FEARFUL OF SLEEPING THROUGH  A SMOKE OR FIRE EVENT   THE SMOKE AND FIRE ALARMS IN THE HOUSE ARE VERY LOUD SOMEWHERE AROUND 300 HZ I THINK  THE SOUND BOARD SHOULD HAVE A POT  TO ADJUST SENSITIVITY  AND CAPABLE OF TURNING ON A RELAY --THE REST I CAN MAKE OUT OF OFF THE SHELF PARTS --ANY HELP WOULD BE GREATLY APPRECIATED

CrossRoads

#1
Aug 29, 2016, 09:20 pm Last Edit: Aug 29, 2016, 09:34 pm by CrossRoads
You can take the audio feed into the speaker, run it thru a low pass filter (10K resistor/4.7uF cap), and use a 10K pot to further reduce to 5V level if needed, and read that as a digital input with the arduino. Then have Arduino drive a transistor to drive the relay coil.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

ChrisTenone

What about a haptic motor under your pillow?
Wubba lubba dub dub!

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