interface relay to 8051 uc

[mohammed_senior]

i am working with 8051 microcontroller and i need to connect a device with it, this device is 12 volts so i need a good relay, so what type of relay i need and how can i interface it to the 8051 system

 

[prateeksikka]

i use the ones locally made in india here as far as such components are concerned.
except for the ICs and intelligent chips ,i dont think it makes much difference....

 

[waferstar]

We don't know what is exactly you want to know .
If your 8051 system want to connect with the 12V system,you should use the 12V power supply and the low down the Voltage to 5V for 8051 system.
and you the relay is used in the 8051 system,you can select the 5V relay or 12V relay ,that is depended on what you want .


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[nikhil arora]

how much curret ur 12v device uses if it is using less current (<500mA)
then u can use ULN2003 to control that device
it is very easy to use  with controller.
if it is less then 1A then u can connect two or three ouput of uln2003 for more current.



Solid state switch are better than relay for lesser current.