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Simple Time Base for 1 Hz or 1 second Using LM555
by dmohankumar
We can set the 555 to
work at the desired frequency by selecting the right combination of
resistances & capacitances.
Frequency = 1.44 / {(R1 + 2R2) * C1}
Also, 555 can produce waves with duty cycle else than the 50 % cycle.
Duty Cycle = (R1 + R2) * 100/ (R1 + 2R2)
where duty cycle= Ratio of time period when the output is 1 to the time
period when the output is 0
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