Connect Arduino to an app

[jrmonsefsh9i9o3]

I want to make an app that controls my Arduino uno which controls a relay. There’ll be two buttons, one to signal it on and one to signal it off. I want it to connect automatically, without needing to manually select device ID/Name. I’m using the HM-10 bluetooth module.
Is this possible? Thanks in advance!

[matt_conroy]

Sure, you can store the device ID as a variable and use it in the Connect block or just enter it manually so that when you press a button, it’ll connect to just that device.