Introduction: Setting Up the Circuit

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Lesson Overview:

Now we'll build our simple circuit!

Step 1: Getting Started

In order to create a functioning touch sensor out of foil (or another conductive object) you will need to use your physical Arudino Uno! The illustrations shown in these lessons come from the circuit simulator, but you can follow along with your Arduino kit.

Let's get started!

  1. Continue to the next step.

Step 2: Connecting Ground

Start by connecting the GND pin on the Arduino to the ground rail on the breadboard. You won't need to supply the breadboard with 5 volts for this project.

  1. Connect the breadboard ground rail to the ground pin of the Arduino.

  2. Continue to the next step.

Step 3: Add an LED

You are using an LED as an output in this project. Wire the LED up to digital pin 12 on the Arduino, protecting it with a 220 ohm resistor.

  1. Place an LED on the breadboard in row E, towards the left side.

  2. Connect the anode (long side) to pin 12 on the Arduino.

  3. Connect the cathode to the ground rail on the breadboard, using a 220 ohm resistor.

  4. Continue to the next step.

Step 4: Add the Sensor Circuit

To add the touch sensor circuitry, you will use digital pins 2 and 4 as the sense and recieve pins. The sensor will dangle off of the breadboard.

  1. Connect digital pin 4 to column 20 of the breadboard.

  2. Connect digital pin 2 to column 24.

  3. Connect a 1 M-ohm resistor between columns 20 and 24 to connect the two pins to each other.

  4. Dangle a wire off of column 24, which is connected to pin 2. This will be your sensor wire!

  5. Continue to the next step.

Step 5: Assemble the Touch Sensor

Finally, you will need to attach a metal foil to the end of the dangling wire. It's easier if this wire is at least 8 or 10 cm long.

Before plugging the wire into the breadboard, you can solder a piece of aluminum foil to the end. If you have a wire with an alligator clip at one end, you can simply clip a conductive object to your circuit!

  1. Continue to the next lesson to learn how to program the capacitive touch sensor.

Next Lesson:Writing the Code

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