Datasheet

There is a single slide switch near the center bottom of

the Circuit Playground Express. It is connected to digital

#7. The switch is unconnected when slid to the left and

connected to ground when slid to the right. Set pin #7 to

use an internal pull-up resistor so that the switch will

read HIGH when slid to the left and LOW when slid to

the right.

This is not an on-off switch, but you can use code to

have this switch control how you want your project to

behave

Note that you need to use an internal

pull-up

for the

slide switch, but an internal

pull-down

for the

pushbuttons.

Infrared Receive/Transmit & Proximity

New in Circuit Playground Express, we've added IR receive and transmit. This means you can communicate with TVs &

other household devices to control them. You can also send commands to the CPX with a remote control. And, finally,

you can send simple messages between multiple Circuit Playgrounds!

By bouncing IR light off of items and reading the reflected light, you can also do very simple proximity sensing!

There's two elements for infrared. The Transmitter is on

the left and is a big clear LED, this is connected via a

transistor to pin #29

On the right is the darker receiver LED, which also has a

decoder chip. This chip will receive the 38KHz signals

and demodulate them for you. The demodulated output

is available on pin #39

There's also a

secret

capability, you can read the 'raw'

analog value from the receiver LED diode to do basic IR

proximity sensing. The direct analog value is available

from pin A10