Asked

Is it possible to connect an I2C device to the EZB v4/2 with just the SDA and the SCL lines connected with the device its self getting its voltage from a higher voltage source (Greater than 3.3v)?
Related Hardware EZ-Robot EZ-B v4
so ground is always a reference to know the amount of voltage. Ground is also super important because if it’s not shared, or has resistance, the voltage can actually be higher - and release magic smoke.
amazing how important a common ground is. And how simple of a thing it is if it’s explained in the correct example