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How to use the 555 timer to delay an incoming signal for a specific amount of time?

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hadef

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how could i use the 555 timer to delay the coming signal for specific amoint of time

i mean i need a circuit that will alarm 2 minutes after the darkness is detected
 

IanP

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Re: timer 555

Connect one 555 as 2-minute delay timer and another 555 as the alarm timer ..
The first timer is triggered by a photo-resistor (dark detector), the second timer is trigged by the first timer (alarm timer) ..
Examples of both circuits can be copied from:
https://www.uoguelph.ca/~antoon/gadgets/555/555.html

Regards,
IanP
 

ziyas

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Re: timer 555

it could help you :
 

farshid.azhir

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Re: timer 555

u need a monostable circuit so 555 timer is nice select for this
this circuit is adjustable 0sec to 8minute
monostable.bmp
 

vicky

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Re: timer 555

for this you have to connect it with the ldr tha a delay circuit and then a 555 timer it will gives you more accurate idea how the circuit hsould work
 

electronics_kumar

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Re: timer 555

hadef said:
how could i use the 555 timer to delay the coming signal for specific amoint of time

i mean i need a circuit that will alarm 2 minutes after the darkness is detected

Convert 555 into monostable multivibrator..that will act as a delay circuit
 

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