Dunno if I should put it here or ask in the "design" section but here goes:
Folks "I have a problem".
The analogue inputs.
2 are the I2C bus and so they will be used.
That leaves only ...... 3?
I need 6.
One way or the other I will have to switch the remaining/some inputs between sensors.
I guess I could use 2. 1 for the "reserve level" from which the water is taken and one which is switched between the 5 different inputs.
That could work. Note: COULD. As it is I have 5 big relays on the board to drive the solenoids. Though they are 2 pole change over, the second one is being used to drive the pump's motor.
I'm thinking/guessing I could use something like 2 x 4016/4066 (yeah I know: CMOS, but as an EXAMPLE) switches and switch the input as needed.
My question/concern is: Is there a TTL equvilant? Could I use the CMOS chips if there isn't one?
Anyone done anything like this before?
I know I would need "de-bounce" on the inputs, or a delay before I read them after they changed inputs. But other than that.....???