Triple LED

Three lamps: red, yellow, and green. Under them, the words you set for those colors. The defaults are stop, wait, and go.

The device drives the lamps by sending one of those words as text on the key you choose. stop lights red. wait lights yellow. go lights green. Matching ignores capitals and spaces around the word.

If you change a word, the device must send that new word. A value that matches none of the three leaves all three lamps dim, and the card shows the text the device sent.

The device name is shown. An id is not.