i2c pins

[ramarro123]

Hi,

i suggest to add a constructors parameter for pins for i2c.

it's useful on device like esp8266 where sometimes people need to map pin on different task

void begin(uint8_t addr);
should be
void begin(uint8_t addr, uint8_t sda = 0, uint8_t sclk = 0);

and on begin function
if (sda != sckl)
Wire.begin(sda, sckl);
else
Wire.begin();

of course just a random implementation, but that keep compatibility with the rest of library

[ladyada]

if you want to send in a PR, we'd accept one where you pass in a Wire & object to begin(), but not individual pins! thanks :)

[stefboerrigter]

See #38.

[caternuson]

Closing in favor of #63 . Using BusIO moves the pin assignment issue outside of this library. Instead, an I2C bus will be passed in and use whatever pins it was set up for.