Blink an LED with the 555 timer
In this project we are going to build a circuit with the 555 timer in the Astable mode. And we are simply going to make an LED blink continuosly at a speed which we can troll.
From the previous page, more has been said about the 555 timer and its capabilities in its Astable mode. However, one other thing we should know is this.
1) The components that determine the frequency of the oscillation: in the schematics you will see two resistors labelled R1 and R2 and you’ll also see another capacitor labelled C1. It is the values of these Resistors and capacitor that determines the nature of your output. Feel free to change the values to see what happens with your circuit.
know these terms too.
High Time: It is the time in seconds the LED will spend being on or at Logic 1(HIGH). And the formulae for this time is 0.693 x C1 x (R1 +R2)
Low Time: it is the time in seconds the LED will spend being off or at logic 0(LOW). And the formulae for this time is 0.693 x C1 x R1
So for example if you use two 100K resistors for R1 and R2 and use a 10uF capacitor for C1 your circuit will have a high time of 1.386 seconds and a low time of 0.693 seconds.
GO to the next tab and lets build something!
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