Explore the Materials

  1. Identify all the materials
  2. Refer to the video and identify each of the components in the completed circuit as one of the following:
    • 1 LED (Light Emitting Diode)
    • 1 100-400 ohm resistor
    • 1 Red wire
    • 1 Black wire
    • 1 Breadboard
    • 1 Arduino Uno board
    • 1 USB cable

Try New Things

  1. Warning: If the LED is plugged into the red row (5V) and black row (GND) the LED will break.

  2. Switch the direction of the LED, keeping it connected to the blue and black rows.

  3. Switch the direction of the resistor, keeping it connected to the red and blue rows.

STEM Connections

Switching the direction of the LED does change the outcome because it has polarity. Electric current can only flow through the LED in one direction.

Add the LED

  1. Warning: If the LED is plugged into the red row (5V) and black row (GND) the LED will break.

  2. Insert the positive (long) leg of the LED into any hole of the blue row.

  3. Insert the negative (short) leg of the LED into any hole of the black row.

Add the Resistor

  1. Warning: Without the resistor, there is a risk that the LED could break when plugged into power.

  2. Insert one end of the resistor into any hole in the red row of the breadboard. Remind students the red wire and resistor are now connected (holding hands).

  3. Insert the other end of the resistor into any hole in the blue row of the breadboard.

  4. Use the blue marker to mark this on the schematic as shown in the video.

Connect the Black Wire

  1. Insert one end of the black wire into any pin on the Arduino board labeled GND.

  2. Insert the other end of the same black wire into any hole in the black row of the breadboard.

  3. Use the black marker to mark this action on your schematic as shown in the video. Remind students the schematic does not exactly match since they have not added the LED to the breadboard.

Connect the Red Wire

  1. Plug one end of the red wire into the pin on the Arduino board labeled 5V on the power rail.

  2. Plug the other end of the same red wire into any hole in the red row of the breadboard.

  3. Use the red marker to mark this on your schematic as shown in the video. Note: the schematic does not actually show the breadboard. Remember, the breadboard is just a device used to connect different components.

Plug in the Arduino board

  1. Connect the Arduino board to a computer using the USB cable.

  2. Make sure the computer is turned on.

STEM Connections

All electrical and electronic devices need a source of power to work. In this activity, the computer is only providing the Arduino board with power through the USB. There is no information being shared between the computer and the Arduino board. The computer is the power source for the electrical circuit, like a battery.

Draw the Schematic

  1. Draw the symbols of the three components as shown in the video. Begin with the symbol for the power source, then the symbol for the resistor, and finally the symbol for the LED.

  2. Connect the three components with lines as shown in the video. Notice once the symbols are connected the electrical circuit is complete.

Label the Resistor

  1. Lay your resistor on a piece of paper.

  2. Circle and label the resistor.

  3. Draw the symbol for the resistor next to the resistor.

  4. Note the wires at each end of the resistor are the same and are called legs.

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