Make: Radio

156 Make: Radio

14 declares all the button pins as inputs and enables the internal pullup

resistors. That means these pins will read as high until the buttons pull them

low by connecting them to negative ground. The loop function reads every

pin, and as soon as it finds a pin with a low value, meaning that the button is

pressed, it transmits the corresponding code using the function tx.send().

The function needs two parameters: the actual code to send and the number

of bits it contains. (Twenty-four bits is a common number for remote

controls. You probably don’t need to change that unless you want to match

an existing remote control.)

RECEIVER ...