I have an enclosure with 24 holes.
know the story that if you have a hammer, everything looks like a nail ?
My current version has
4 motion sensors.
1 remote input to change the state
2 outputs for relays
2 outputs for local LED
2 outputs for remove LED’s (near the key switch)
2 pins - I2C for the RTC
4 pins - SPI for the SC card
since I have these 24 holes, I figure I could have a pair to show the statis of each sensor
8 outputs for LED’s
1 for power
2, for current state (occupied, unoccupied)
since I think I will need to put on a shift register. I figures, heck, why not light up the board ?
3 shift registers in not too much more to do than 1.
but, me thinks,… why not add some inputs ? a little shifin, 74HC165 ?
then I thought… well, if I am going to put on 16 LED’s why not go multi color ?
sorry that is as far as I got, only have a 30 minute commute to work.