![]() In the above calculations, the LED will be turned ON after the calculated time duration. Similarly, the LED will be OFF when the output Pin3 of 555 Timer IC is set to High. Which means that whenever the output Pin3 of 555 Timer IC is Low, the LED will be ON. Here, we have used the reverse logic with LED. Generally, the time duration for which Pin3 of 555 Timer IC will remain high, can be derived by the given formula: After one minute of time duration, the LED will automatically turn ON. The 555 Timer starts timing when switched ON. We have to configure 555 Timer in Mono-Stable mode to build a timer. For 5 min, 10 min and 15 min you just have to change the resistor value (R 1). The above circuit diagram is for the 1-minute timer circuit.
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