how a relay can be connected to an appliance

[snehanair]

how many appliance can be connected using a relay?how can v take output from an IC using relay?please help
thank u

 

[ckshivaram]

it depends... relay will have 2 states. Nornally open and nornally closed.

so device is connected to nornally closed pin because when you need it to be connected you change over the switch, and when you dont need you bring back relay to nornally open state. So it is nothing but a switch that acts as ON and OFF switch.

---------- Post added at 20:29 ---------- Previous post was at 20:27 ----------

if you talk of relay connecting to controller then you need a driver for that and the driver you can use is ULN2003 or ULN2803. connect port pin of controller to input pin and output of ULN to relay.

 

[lockman_akim]

it depend on relay that u choose..it can be 2 or more appliance that u can control..

and this how to control relay with IC

**broken link removed**

 

[ckshivaram]

8051 microcontroller hardware interfacing tutorials circuits schematics assembly C language programming - i/o ports on 8051 port
See How to connect relay and appliance with uln2003 : 8051 Microcontroller Projects AVR PIC Projects Tutorials Ebooks Libraries codes

 

[Tahmid]

Hi,
It depends on the relay you're using. There are relays where, when you power the coil, 4 or 5 or even more loads can be switched on and switched off when power is removed. However, this means they'd all be powered on/off together and you won't have individual control - for this, you'd need to use separate relays. The most common relays you will find will allow you to control 1 or 2 loads at a time.

Hope this helps.
Tahmid.