Want a 555 timer circuit with Passive IR trigger circuit

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balaji_moorthy

Joined: 20 Nov 2005
Posts: 2

20 Nov 2005 19:50 ir triggered timer

Dear Friends

I am looking out for a timer based on IC555 which can be triggered by a PIR . and the timer is used to swithch on a floresent tube or CFL tube for a duaration of 5 minutes to 20 minutes.

The tube shud be able to activated and swithced off automaticaly after the preset time.

PLS HELP
regards

seadolphine2000

Joined: 12 Apr 2005
Posts: 621
Helped: 39

20 Nov 2005 20:24 555 timer trigger

Check these pictures,

For 20minutes you need
R1= 1MOhm
C1= 1000uF

I'm using this circuit as a phone limiter.
i.e: the phone line is cut after a certain time.

The output circuit is just a transistor is 2N3904, relay 5V and a biasing resistor 330Ohm.

Note:
put your IR sensor instead of the square wave generator.

Hope this helps, please tell me if the picture isn't clear.

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balaji_moorthy

Joined: 20 Nov 2005
Posts: 2

21 Nov 2005 20:11 555 trigger circuits

Dear friend

Thanks very much for the circuit. the schematics is very faint wud be happy if u cud send me aclear copy.

i would also like to tell u that i want to use it to switch a floresent tube which works on 230 volts AC.

Will the convectional relay create spikes or transients while making and breaking

can i use a solid state relay, if so how

Also that if there is a trigger again it shud not effect the fuctioning or rather reset the circuit to off position when once triggered.

regards

balaji

ps. note i am going to try out the circuit once i receive yr msg

tks

Added after 7 minutes:

seadolphine2000 wrote:

Check these pictures,
Dear friend

Thanks very much for the circuit. the schematics is very faint wud be happy if u cud send me aclear copy.

i would also like to tell u that i want to use it to switch a floresent tube which works on 230 volts AC.

Will the convectional relay create spikes or transients while making and breaking

can i use a solid state relay, if so how

Also that if there is a trigger again it shud not effect the fuctioning or rather reset the circuit to off position when once triggered.

regards

balaji

ps. note i am going to try out the circuit once i receive yr msg

tks

For 20minutes you need
R1= 1MOhm
C1= 1000uF

I'm using this circuit as a phone limiter.
i.e: the phone line is cut after a certain time.

The output circuit is just a transistor is 2N3904, relay 5V and a biasing resistor 330Ohm.

Note:
put your IR sensor instead of the square wave generator.

Hope this helps, please tell me if the picture isn't clear.