What is the purpose of the common pin on the KY-016 Full Color RGB LED Module?

The common pin on the KY-016 Full Color RGB LED Module is used to control the polarity of the LED. Depending on the specific model of the module, it can be either a common anode (CA) or common cathode (CC) configuration. In a common anode configuration, the common pin is connected to the positive (anode) terminal of the LED, while in a common cathode configuration, it’s connected to the negative (cathode) terminal. This configuration determines how you need to control the LED using your microcontroller. Make sure to check the module’s documentation to determine whether it’s a common anode or common cathode module.