![]() So to build a 5 minute timer circuit, we would be simply changing the resitor value to 272.7k ohm in above given 1 minute timer circuit. ![]() We can easily calculate the resistor value for 5 minute, 10 minute and 15 minute timer circuit: ![]() So to build 1 minute (60 seconds) timer we need resistor of value 55k ohm and capacitor of 1000uF: In monostable mode, the duration for which the PIN 3 would remain HIGH, is given by the below formulae: We need to set 555 timer in Monostable mode to build Timer. All we need to change the value of Resistor R1 and/or Capacitor C1. We can use this property of 555 timer to create various timer circuits like 1 minute timer circuit, 5 minute timer circuit, 10 minute timer circuit, 15 minute timer circuit, etc. It means for some time output pin 3 is HIGH and for some time it remains LOW, that will create a oscillating output. As the name suggest 555 timer is basically a “Timer”, which create an oscillating pulse.
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