I2C GPIOs are hardcoded

[lurch]

Something I just noticed, is that there's several places where you specify that GPIOs 2 & 3 (i.e physical pins 3 & 5) have fixed hardware pullups. However for very early Rev1.0 Pis, the physical pins 3 & 5 with hardware pullups are actually connected to GPIOs 0 & 1 - see http://elinux.org/RPi_Low-level_peripherals for more info.

GpioZero ought to check the board's Revision (as found in /proc/cpuinfo - see http://elinux.org/RPi_HardwareHistory) and use that to determine which GPIOs have the hardware-pullups.

And of course the ComputeModule doesn't have hardware pullups on any GPIO, although the intersection of ComputeModule users and GpioZero users is likely to be very small ;-)

[waveform80]

Good point

[waveform80]

Fixed in #246 (including for compute module users :)