November 2, 2009
Tutorial - Sensor Interfacing
about 5 years ago
When interfacing 3.3 to 5 I always use a voltage divider on lines going form high (5) to low (3.3) voltage and a series resistor on the opposite direction when I cannot guarantee high impedance (eg. on some MCUs after reset). It’s cheap and as far as I know safe.
I just pull both lines to 3.3V and that’s it. As in I2C floating is 1 and pulling it low is 0. PICs are happy working with 3.3v logic.
I know it’s been more than a year…
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