Need Help with a LED sign

i need to make a Sign for my work, that turns on when a buzzer rings, what im looking to do it have a vibation sensor, attached to the buzzer (i cant splice into the buzzer) a micro controller to have the sign turn on for 30 seconds, to turn on a string of leds, what would i need to do this, i know a bit about electronics but im not sure what i would need to make this work, any help would be really appreciated

vibration sensor and or a sound sensor to turn on a string of leds for a set amount of time

by RyanKorponay
December 31, 2018
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1 Answer

Answer by mikerogerswsm

You could use a Velleman vibration sensor:

https://www.velleman.eu/downloads/29/vma312_a4v01.pdf

triggering a 555 timer in monostable mode:

http://www.ti.com/lit/ds/symlink/lm555.pdf

and driving your display:

https://www.google.com/search?rlz=1CAACAT_enGB772GB772&biw=1366&bih=666&tbm=isch&sa=1&ei=UWkqXObVM6SUlwTBt6iYBw&q=led+sign+schematic&oq=led+sign+schematic&gs_l=img.3...20513.26695..28226...0.0..0.60.553.10......1....1..gws-wiz-img.......0j0i67j0i8i30j0i24.6i5hrSl66Yk

The leds drop a couple of volts each and need a series resistor to limit the current to 20mA in each device. You may find you need to put them in parallel, with a really beefy driver transistor or FET.

+1 vote
by mikerogerswsm
December 31, 2018
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