PaulS:
Check with a multi-meter. I'm pretty sure that you'll find that the SCL and SDA pins and pins 20 and 21 are connected. The extra locations are for convenience, not for isolation.
On the schematic, it shows them connected.
PaulS:
Check with a multi-meter. I'm pretty sure that you'll find that the SCL and SDA pins and pins 20 and 21 are connected. The extra locations are for convenience, not for isolation.
On the schematic, it shows them connected.