Arguably the biggest advantage of the Arduino ecosystem is how easy it is to get your code running. Type a few lines into the IDE, hit the button, and in a few seconds you’re seeing an LED bl… ...

Install this library to Arduino IDE, using "Add library from ZIP... Set jumpers on shield: RX-io, TX-io, DE, EN (near Slave) Connect (by wire!) PIN 4 (marked as TX-io on the shield legend) with TXD1 ...