Datasheet

The speaker is the squarish gray chunk on the bottom

left of the board. There is a small class D amplifier

connected to the speaker so it can get quite loud! Note:

it won't sound good if too loud, so some

experimentation may be necessary

The amplifier is connected to the true analog output

A0 pin -- this pin is also available on one of the

connection pads in the lower right. You can tell it's the

analog output pin because of the squiggly symbol.

If you do not want the internal speaker to make noise,

you can turn it off using the shutdown control on pin #11

Sensors

The Circuit Playground Express has a large number of sensor inputs that let you add all sorts of interactivity to your

project.