[SOLVED] Lcd backlight control with button

[shahbaz.ele]

Dear all
I am using 16x2 LCD with ATmega32 microcontroller.
I need to save my power so I want that LCD back light should remain OFF during day time and when it is needed I should have switch to ON it.
the two intrrupts are busy in my circuit.
can I add a button (ON-OFF switch for it directly connected to 15 and 16 pin with supply.

 

[kamranravian]

LCD backlight could be ON and OFF with a switch directly, but it is not recommended you have to write a programme through third intrrupt nad add transistor to ON back light.

 

[shahbaz.ele]

dear can you please post me the circuit for it.

 

[alexxx]

the two intrrupts are busy in my circuit.

I don't see a reason why an interrupt should be used. You could do that with polling method, that is read it every some ms and debounce it. Actually I think it is better this way. You are OK without interrupt don't worry about it.

 

[nandhu015]

LCD backlight could be ON and OFF with a switch directly, but it is not recommended you have to write a programme through third intrrupt nad add transistor to ON back light.

why not? could you please explain in detail..

 

[ZASto]

@kamranravian, can you explain why switching backlight with a switch is not recommended?

As for the interrupts, the interrupts are powerful weapon in uC's so should not be wasted for silly things.

 

[kamranravian]

ZASto thanks for your comments
I mean to say normally you should use uC for switching BL.
you can also directlly do by on-off button.

 

[shahbaz.ele]

I am thankful to all of you. my problem is solved