Reaction timer is a game to test how fast you reacts. This game which we have developed using 555 IC is for two players where first player starts the game by pressing start button. As soon as the START button is pressed, 7 segment display starts displaying 0 to 9 numbers in a high speed. Then other player stops the counting by pressing the STOP button. As the frequency of displaying numbers is very high, it is difficult and needs full attention to react on the correct time. Watch the video below to see demonstration of this reaction timer game.
A Johnson Counter IC 4026 is used along with 555 IC. If you are well aware of 555 timer IC and its working, you can easily understand it and build it by yourself. Here is the detailed tutorial with circuit diagram:
http://circuitdigest.com/electronic-circuits/reaction-timer-game-using-ic-555
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