5V for electronics it’s getting older but sometimes you need to connect a 5V system to a 3.3V device. A typical example is connecting an Arduino to, let’s say, a MMA8452Q accelerometer. In this particular case you need to connect the I2C bus (and optionally the 2 interrupt pins) of the MMA8452Q to the I2C port of the Arduino (A6 and A7). While it just might work, most of the times the 3.3V device performance will be degraded, or it would suddenly stop working. Read more
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