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Home Automation Relay Connection


Moderators: Ajay, Junied , abbas1707, Arun Kumar V, pdi33, Shailesh NAYAK, ۞ TPS ۞, shyam, sashijoseph

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fadhli

Sun Mar 23 2008, 02:48AM

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Can i connect 5v relay to ULN2803A to drive 230V appliances such as fluorescence lamp?

[ Edited Sun Mar 23 2008, 07:33AM ]

fadhli

Sun Mar 23 2008, 09:03AM

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which pin should i use? NC or NO?

sashijoseph

Sun Mar 23 2008, 10:04AM

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Since the project has LED's connected it means for switching on the LED,the port pin is 0 and for switching off pin is 1.
When you connect the ULN instead of the LED,the relay will be off when the command is for switching on and vice-versa.So you may connect the fl. bulb to the NC of the relay so that when the relay switches off(with the 'on' command),your bulb lights up.

Let there be music........

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fadhli

fadhli

Fri May 02 2008, 04:09AM

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sir,
i don't have any idea how to check my circuit.

can i show the picture of my circuit here?

i've have to present this project on monday, now is already saturday.

i can't finish my report if this project does not work.

LoL

[ Edited Fri May 02 2008, 04:10AM ]

pdi33

Fri May 02 2008, 04:42AM

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well then , show us ur ciruit. attach it to ur post.
To check ur relay connection across the uln chip, just connect a LED across the relay coil with a resistor in series so that it lights up when the relay is turned ON.

* inspired to develop,developing to inspire *