Hello, I'm working with Wire library,Arduino Mega and I2C bus (20 and 21 pin), i need to use 3.3 volts i2c devices but SDA and SCL on Mega ever have pull ups to 5v. my ask: Is possible to dissable pull ups on pin 20/21 ? how ?. Level shifter is the only solution? I tried to modify twi.c without…

Arduino Mega I2C pull ups for 3v3

CrossRoads October 31, 2012, 1:08am 4

So are you going to remove them & replace the other 2?

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