- Sat Jul 15, 2017 5:42 pm
#195584
I have a Pro Micro 5V/16 Mhz and want to use the I2C. What libraries should I include?
I tried Wire and HardWire but neither of them turn on the weak pull up resistors which tells me they are not compatible. When I add external 1K resistors, I see clock and data activity. I was getting the correct address but no ACK from an MCP23017 connected to the I2C bus. I tried a few things and thought I got back to the original configuration but the activity has changed. It was the correct address with a read bit but no ACK. Now I just see 010 between START and STOP.
Thanks,
Rick
I tried Wire and HardWire but neither of them turn on the weak pull up resistors which tells me they are not compatible. When I add external 1K resistors, I see clock and data activity. I was getting the correct address but no ACK from an MCP23017 connected to the I2C bus. I tried a few things and thought I got back to the original configuration but the activity has changed. It was the correct address with a read bit but no ACK. Now I just see 010 between START and STOP.
Thanks,
Rick