I have an older board with a 90s1200 on it. It operates as an infrared repeater in my entire house.
Runs on 5 volts. It is wired through my unused phone lines.
This allows me to use a very nice backlit IR remote control in another area of the house.
The interrupt uses INT0 on the falling edge and sends the IR pulses in the ISR.
The system has worked for more than 10 years and it's still working great.
I want to add 2 more zones to the repeater, but there is only one external interrupt.
I don't want to change the avr to a newer one if I can get away with it.
The avr is smd and i would rather not remove it or I will be making a new board.
I thought of using a 74AC125 with outputs connected to INT0.
Is there a better way?
Any helpful ideas will be appreciated.