When inserting I2C addons, you need to check polarity before insertion - this is a good habit. In order to do that, you need to flip the phone. However, it'd help if there were + and - markings on the back board instead, on the top - they should be visible from the gap between the Pi Zero and the back PCB.
When inserting I2C addons, you need to check polarity before insertion - this is a good habit. In order to do that, you need to flip the phone. However, it'd help if there were + and - markings on the back board instead, on the top - they should be visible from the gap between the Pi Zero and the back PCB.