About MCP23017:
I've realised there is no "all-in-one" solution to do everything combined.
So I've decided to break into parts:
-
MCP23017 boards will be used with I2C through a AtTiny85 adapter and one of these nodes.
Sadly I'll loose the INTERRUPT possibility. -
I'll drop PCF8574 modules. Use Arduino boards directly only.
(Same price\PIN ratio + shielded USB included. A 7 port USB HUB costs < $5. So it's not worth the trouble.) -
Temperature reading will be a completely other thing. Maybe with AtTiny85 boards using a safe 1wire PJON system and protocol.
-
As I've said before: I'll drop Firmata. More trouble than reward.
Closing this topic.
