7. Before connecting the microcontroller to the battery, double check all of your connections to make sure it matches the diagram above (Figure 3.5).
8. Insert the battery into the battery holder so that the positive side, indicated by the “+” symbol, is on the side of the holder with the red wire, and the negative side of the battery is on the side of the holder with the black wire.
9. Connect the black wire from the battery holder to the “GND” pin on the microcontroller. You can also do this by connecting the black wire from the battery holder to the “(-)” rail that the microcontroller “GND” pin is also connected to.
10. Connect the red wire from the battery holder to the pin labeled “BAT” on the microcontroller (see Figure 3.6 below). Once the battery is connected, the LCD should light up and display “Hello!”. For instructions on charging the battery, see the Charging the Battery page.