I have a Nxtop DC 24V industrial signal light to work with a small Arduino controlled relay board - which in turn is controlled by a PC to collect data via USB. A 24v supply with a 5v buck converter brings it all together. I use a green light to indicate when the machine is in use (and the operator is in sync with the work). I use red to indicate when the machine is not in use. Orange is implemented as a slow or fast flashing light (the flashing is controlled by the Arduino) that indicates whether the program thinks the machine is running but no job (slow) or if a job is selected but the machine is not working (fast ). I haven't decided yet if I'm going to use the buzzer. Using the stack indicator was pretty easy. I'll say it works well, but I'll also say it's not as bright as I would have preferred for a factory floor. but $22 is a solid value. The mount is not as flexible as some alternatives, so this may affect your decision (if you have a limited number of mount points). Conditionally recommended
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