It is good practice to connect only one component to each signal for example, if you have an Arduino shield that makes use of Arduino I/O pin 6, you should not also connect the green element of the tri-color LED on port 2. Mixing top and bottom side connectors It is quite possible to use Arduino shiels and top side connectors simultaneously, but care must be taken to ensure that signals that map to both the top and bottom connectors are appropriately programmed and connected. You can use A5 as a traditional analog input: an external analog signal will safely override the battery voltage signal. Use another analog port if you wish to retain this feature. Battery Voltage Detect: The Hummingbird Duo has an integrated battery voltage monitor that makes use of analog input pin A5.
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