Learn
Circuit Playground: Part 2
Capacitive Touch

But what happens when we have more than two sounds? Two buttons is simply not enough for the cool things that we want to do.

Well, we are in luck. Circuit Playground Express comes with multiple capacitive touch sensors.

This quick-start example shows how you can read the capacitive touch sensors built into SEVEN of the Circuit Playground Express pads (pad `A0` is not a capacitive touch pad).

Pads `A1`-`A7` can be used as capacitive devices and to access them, we can use:

• `cpx.touch_A1`
• `cpx.touch_A2`
• `cpx.touch_A3`
• `cpx.touch_A4`
• `cpx.touch_A5`
• `cpx.touch_A6`
• `cpx.touch_A7`

In this exercise, we are going to add some code to the `while` loop so that there will be a musical note for each touch sensor.

### Instructions

1.

Inside the `while` loop, we are going to add some `if` statements.

If `cpx.touch_A1` is touched:

• Play the frequency `262` for `0.5` second.
2.

If `cpx.touch_A2` is touched:

• Play the frequency `294` for `0.5` second.

If `cpx.touch_A3` is touched:

• Play the frequency `330` for `0.5` second.

If `cpx.touch_A4` is touched:

• Play the frequency `349` for `0.5` second.
3.

Drag and drop the downloaded file into the CIRCUITPY drive on your computer.

Touch the `A1`, `A2`, `A3`, `A4` pads.

Note: No extra hardware is required, you can touch the pads directly, but you may want to attach alligator clips or foil tape to metallic or conductive objects. Try silverware, fruit or other food, liquid, aluminum foil, and items around your desk!