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Author Topic: DARK ACTIVATED SWITCH  (Read 5862 times)

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benson

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DARK ACTIVATED SWITCH
« on: June 17, 2011, 23:50:23 PM »
I try to buit the second circuits of light/dark activated switch but i got some problems and need help. My 100K linear potentiometer have 5 legs (pins)
Which pin should i connect to 1K and LDR. Also My 12v delay has 8 pins and i connected as suggest by Kammenos but the leds not lighted. Please advise. Thanks. Attached 2 images switch and delay. When you look at top with 2 pins left on top these are numbers. The first line from left to rigth: 1, 4, 6 and 8. The second line:
15,13,11 and 9. It is 502N1-2C-S 12VDC 0960c2.

_pike

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Re: DARK ACTIVATED SWITCH
« Reply #1 on: June 18, 2011, 01:42:53 AM »
Welcome to the forum!.
1)Make the connection as described to the image below.
2)on the top of the relay there is a schematic.The coil is drawned as a spiral.
3)ALWAYS REMEMBER GOOGLE IS OUR FRIEND!!!!!!!!!    --->http://www.datasheetdir.com/502N1-2C-S+download

benson

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Re: DARK ACTIVATED SWITCH
« Reply #2 on: June 18, 2011, 12:23:51 PM »
Thanks very much, will try next morning

benson

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Re: DARK ACTIVATED SWITCH
« Reply #3 on: June 19, 2011, 08:01:05 AM »
Hello Pike,

I test it and verything is ok except the relay. the series of leds lighted only if i remove the relay and connect leds series to 1n4001 diode. do you know what wrong is it. also what relay does in reality? Thanks

_pike

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Re: DARK ACTIVATED SWITCH
« Reply #4 on: June 19, 2011, 09:14:07 AM »
The relay is a SWITCH it closes some contacts when it is armed, and it closes some other contacts when it is disarmed. We usually use the relay to switch heavy loads.Use the connection below for your leds.How many leds do you use?

benson

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Re: DARK ACTIVATED SWITCH
« Reply #5 on: June 20, 2011, 09:18:50 AM »
Hello Pike,

Thanks again for your help. I am very appreciated. i use 18 white leds in series. By the way, it works without the relay. I have another question. I connected 12v solar panel to charge the 12v battery + to + and - to -. In the sunny day, it burned my 2n222 NPN. Any idea how to prevent that. Can i ad 25v super-cap between 12v source and 2n222 or do i need 12v regulator? I am sorry for many questions because i am a learner.

Regards,


kam

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Re: DARK ACTIVATED SWITCH
« Reply #6 on: June 20, 2011, 23:04:26 PM »
can you upload the schematic for the charger?

benson

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Re: DARK ACTIVATED SWITCH
« Reply #7 on: June 21, 2011, 22:52:31 PM »
not sure why can't post the reply

benson

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Re: DARK ACTIVATED SWITCH
« Reply #8 on: June 21, 2011, 22:55:37 PM »
Hello Kam,

Here you are.

kam

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Re: DARK ACTIVATED SWITCH
« Reply #9 on: June 22, 2011, 00:27:48 AM »
you have the LEDs in series or parallel? And what protective resistor have you add? Because i do not see any in the schematic. If you do not add a protective resistor, little above the forward voltage of the LED, the current is increased dramatically fast.

benson

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Re: DARK ACTIVATED SWITCH
« Reply #10 on: June 22, 2011, 12:06:46 PM »
Hello Kam,

It is in series with 1k resistor. Do you know why it burned my 2n2222 transistor?

benson

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Re: DARK ACTIVATED SWITCH
« Reply #11 on: June 22, 2011, 12:11:33 PM »
Sorry i connect all LEDs + to +, and - to -. I think it is parallel.

kam

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Re: DARK ACTIVATED SWITCH
« Reply #12 on: June 23, 2011, 13:04:07 PM »
how many volts is your panel able to provide? Maximum with full brightness

It is very strange, because 1k resistor is very big to let the 2n2222 blow...

and something else. LED specifications. What is the forward voltage (Vf) and forward current (If) of the LEDs?
« Last Edit: June 23, 2011, 13:07:16 PM by kam »

_pike

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Re: DARK ACTIVATED SWITCH
« Reply #13 on: June 23, 2011, 14:26:19 PM »
What is the forward voltage (Vf) and forward current (If) of the LEDs?

If you don't know these specs tell us what color they are.Also why don't you try with the relay?
« Last Edit: June 23, 2011, 14:29:26 PM by _pike »

benson

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Re: DARK ACTIVATED SWITCH
« Reply #14 on: June 23, 2011, 22:21:35 PM »
They are white leds, I am not using relay because the leds not lighted. May be relay is dead. How can i test the relay is it good or not?

Thanks