I'm going through the process of testing my new build and one of the issues is with the light sensor. When it is connected to the I2C bus on the Grove base shield, the serial monitor stops outputting data all together. When I unplug it, data flows normally though the serial monitor. When it's unplugged and data is flowing, I get an error that says "tsl2561 read register timeout".
Here's what I have done,
Verified 3.3v on the I2C connector
Verified SDA & SCL were actually connecting to SDA and SCL on the Arduino.
What am I doing wrong?