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labs/lab-3_1.md

@@ -99,6 +99,10 @@ You know on the Arduino Nano this value will be between 0-1024, and that your ma
 
 Your battery, however, has a higher voltage than that. We now need to undo the effects of the voltage divider to determine the battery's original voltage. Since we used the same resistance on either side of the voltage divider, the voltage is being cut in half. Therefore, we can simply multiply the Arduino's recorded voltage by 2 to get the 9V battery's voltage. It should be somewhere between 8 and 10V.
 
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+Note that the values displayed in the serial monitor are rounded, and don't show us as accurate of voltages as we would like. This is because the value is stored as an "int", or integer. To obtain decimal places, change this to a double.
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 ### 3. Adding the Temperature Sensors
 
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