If I were you, I would go ahead and get differential transceivers for the 10 meter distance. It sounds like the majority of signals are driven by one ATTiny85 and received by a neighboring ATTiny85 about 12 inches away, with a good ground connection between them. I know some people push towards RS422 or RS485 transceivers for distance applications, but I'd like to keep the total part count down, if possible. With these constraints, do you think the ATtiny85's built-in serial or SPI would still work well over the 5 to 10 meters from the closest module to the master. There will be 12v+ running to each module to drive the LEDs and regulated down to 5V for the ATtiny. In either case, the modules will be connected in a daisy chain to each other.Įach module will have a resistive touch sensor and be driving about 12 - 16 RGB LEDs (I'm making a step responsive disco dance floor). The communication packets will be small and will probably be at 115200 baud if using ATTiny85's TTL serial or 1MHz if using SPI. Each slave module will have a ATtiny85 to manage the sensor reading, LEDs and the network protocol. I'm setting up a grid of 200+ slave modules which will be about 12 inches apart and the master will be anywhere from 5 to 10 meters away from the closest module.
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