You might remember a few years ago when I shared how I monitor my running CNC machine. Looks like Dave from Plastibots has added a cool twist to the idea. Dave uses a wireless IP camera to monitor his equipment but he also came up with a way to wirelessly e-stop the machine by remotely pressing the escape button if the system is acting up. Instead of coming up with a new way to communicate the e-stop command he saw that the IR lights could be turned on and off remotely. By hijacking the signal line for this operation he is now able to use the re-purposed signal to shut down the CNC remotely.