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Last Updated on: Thursday, November 30, 2017 07:43 AM

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Restaurant Table Service Request Flasher

Problem:  Develop a  simple way to help his waiters know when someone at a table needed service. 

Solution:  A flashing light on the table would get the waiter's attention.  The circuits for the battery powered device which when activated would flash some lights is shown below. 

The circuit consists of a single 3v lithium coin cell battery to power the device.  Four super bright green LEDs are flashed when the assembly was rotated into the “Requested Service” position. A tilt switch senses when the device is in that position.  A simple timer turns off the flasher after 3 minutes, if left in the flashing position. 

Click on Drawing Below to view PDF version of Schematic
Schematic of table flasher

View Table Flasher in Action


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DC Magazine, Nov 2010, Page 7:  Restaurant Table Service Request Flasher


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