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Dear I think MAX250,1,2 is a good option.
If you guest need isolation for the purpose of surge and error generation, its a good option.
these MAX IC's provide you isolation from outer surges.
shahbaz.ele
yo can design your own.
main parts are
1. low voltage pulse generator
2. amplifier
3. transformer
4. controlling unit (uicrocontroller etc)
check out your regulators separatly
also check out transformer to 7805 with its positive side.
individual testing may be helpful as suggested by shahbaz.ele
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.
you can use power down or idle mode, because intrrupts will wake up your circuit.
After displaying complete messages you should enter idle mode intrrupt will wake up, then you perform your required commands and again enter idle mode.
This will be enough I think you can understand what I want to say
you can use following instructions to set or clear bits of any register
MCUCR |= (1<<0); //to set bit 0 of MCUCR
MCUCR |= (1<<7); //to set bit 7 of MCUCR
MCUCR &= ~(1<<0); //to clear bit 0 of MCUCR
MCUCR &= ~(1<<7); //to clear bit 7 of MCUCR
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