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3 Sep 2014


This nicely-built quiz game buzzer system is Arduino-based and captures the fastest player or “first to respond” out of four players.

A good friend of mine who’s a teacher was doing quizzes in her class making students compete to answer questions… resulting in them complaining they raised their hands before the others. I decided to give her this quiz show type buzzer for Christmas to solve her problems. When one of the players press it’s button (the fastest player wins this), the led of the right colour lights up saying he’s in control… and no other buttons from the other players work, until the master of the game decides if the answer is good or not by pressing a little button on the main unit, giving a point or not to the player in control.

Arduino quiz show buzzer - [Link]

27 Oct 2011

anonymouse197 writes:

This instructable will guide you through creating your own Arduino based Kitchen Timer. This is a quite simple project, requiring little or no programming or electronics knowledge, just the willingness to learn and fiddle – an ability most useful for modern man.

This kitchen timer is simple enough, press and hold a button and it will count up it multiples of five minutes, until you release the button. Upon doing so the timer will flash, and begin counting down. This timer includes an alarm and a display, with a piercing piezo buzzer to get your attention.

The arduino, laptop, protoshield, and USB Cable excluded; I took every electrical component from an old or broken device. Try to recycle things, its easy to get hold of broken electronics for free so make the most of it! See any jumpers on this design? No, paper clips are much better – cheap as chips and more sturdy too! :)

Arduino Kitchen Timer - [Link]

27 Sep 2011

This articles describes about making a general purpose I/O board that is easy to construct and is very useful for rapid prototyping of microcontroller-based projects. The board basically contains the most frequently used I/O devices and peripherals such as LCD, EEPROM, tact switches, LEDs, buzzer, etc. All the necessary pins of the devices on the board are accessible through female headers that allows easy connection of the board to a breadboard circuit or other development boards using male jumper wires.

Experimenter’s I/O board  - [Link]

12 Jan 2011

This circuit is a Dark Detector using a 555 timer IC. The 555 is configured as an astable oscillator to drive the piezo buzzer. Check circuit diagram on the link below.

“Dark Detector” using a 555 timer IC – [Link]

19 May 2008

Miami Mike writes:Recently our club’s winch went out of control and destroyed a glider. The operator took his foot off the pedal but the motor kept running, folding the glider’s wings and slamming it into the ground. Fortunately the winch had a cutoff switch and we were finally able to stop it. It happened because our winch only had one solenoid and the contacts inside had gotten stuck together. We now have two new solenoids wired in series, and I’ve designed a small device to help prevent this sort of thing from happening again. [via]

Sailplane Winch Solenoid Safety Buzzer - [Link]

19 Apr 2008

This rain detector will give you a heads-up the instant it starts to rain, hopefully giving you time to close windows and bring in possessions. The battery-powered circuit draws virtually no current when the sensor is dry and the current consumption is low when the buzzer is activated so a couple of AA cells will last a long time. Alternately, a molded power supply with a simple voltage regulator to drop the voltage to 3 volts could be used. The circuit is basically a handy flasher circuit that operates well on only 3 volts using ordinary silicon transistors. When the circuit is triggered, the buzzer is pulsed about once per second. [via]

Rain Detector - [Link]

16 Mar 2008


 This is a simply and easy build 4-channel timer, suitable for energy saving, simple hardware and nice firmware with c coding. Automatic power down mode, simple settings, optional  buzzer for sound alarm.This project use ATMEL AT89C4051 and MAX7219 as the main parts. [via]

xTimer V1.0 - [Link]


2 Feb 2008


Water Level Buzzer is a simple kit which will buzz when water reaches the sensor level.

  • Input – 9 VDC @ 40 mA
  • Output ??? Buzzer
  • Terminal pins for supply voltage
  • Power-On LED indicator
  • Four mounting holes of 3.2 mm each
  • PCB dimensions 32 mm x 35 mm

Water level buzzer - [Link]





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