Section 8.1 LED with no Code
For this part we are going to light up the LED without the use of any code on the CPX. First, wire up the circuit with the positive end connected to 5V. This is how my circuit looks. Make sure to use a resistor between 300 and 1000 Ohms. An LED does not have that much internal resistance so you need a resistor in series with an LED to reduce the amount of current flowing through the LED or the entire LED will fry. If you use a resistor that has too much impedance the LED just won’t turn on because the voltage/current through the LED will be below the activation voltage of the circuit.
Once you have that circuit working, wire up the circuit again with the 3.3V output. Do you notice anything different when you hook up the circuit with different pins? Here’s my circuit. Do you notice something different about the intensity of the LED? Why is it different?
