I am hoping to interface a picaxe 18m2 ( at 5 volts ), to a HMC 5883L module ( at 3.3 volts ), using I2C for communication.
Are there any " gotcha's " to look out for, or must both device run off the same voltage.
If different supply voltages are OK, should I tie the I2C data and clock lines to the higher or lower voltage.
Are there any " gotcha's " to look out for, or must both device run off the same voltage.
If different supply voltages are OK, should I tie the I2C data and clock lines to the higher or lower voltage.