I have an arduino due and a lcd 16x2 i2c PCF8574. If i connect my lcd with 3.3v and hook it up to the i2c the i2c scanner detects “0x27” which is correct. The problem is the lcd needs 5v to operate correctly (with 3.3v the screen doesn´t light up. only the led of the PCF8574). I tried a bidirectional level converter from 5v to 3.3v but the response i get from the i2c scanner is only once these two address “0x02”,0x03" and than nothing. This also happens if i only connect the bidirectional level converter without anything else. Are these two address from the level converter?
Anyone an idea?