In the centre of the Circuit Playground, to the left and right of the accelerometer is the infrared (IR) transmitter and receiver. Using IR to communicate on the Circuit Playground is easy! We use the network block to select a number to transmit, and a network block to receive numbers and store them as a variable. We can also send variables that are stored as numbers, such as RGB colours. Most of what happens when we send an IR signal happens behind the scenes.