Does anyone know how to make a USB switch or know where I can purchase one? I need a switch that can complete a circuit when you press an icon, then goes off again. We are trying to get it to open our cash drawer. Right now we have a door bell set up but it is hard to find a location that customers cant reach, that is easily accessible for employees. A button on the computer would be nice, I just need to figure out a way to accomplish this.