Im building a egg incubator using a mega 2560 as the controller. The wires have to fit into a space between the door channel and the seal so I can only get 8 wires from the mega to the front panel
im using a 4x20 display on IC2 and 4 buttons (edit/up/down/light) but I want to add another 3 outputs. On hand I have a Attiny85 and I have a extra IC2 lcd interface in the post both I think can be made to be used for the extra outputs.
the input buttons are used in the program in such a way that I don't think I can add them to the IC2 as you have to hold the edit button while using the up and down buttons on certain screens.
If the outputs fail that's not a big deal as long as the mega does not hang waiting for wire transfer (mega is doing temp control and pwm the heater so hanging is a bad thing)
any ideas of what posts/links I should be researching?
im thinking tinywire on the attiny as a slave and wire.h on the mega as master but im worried about data failing to transfer and the loop stopping in the mega.