You can actually build a bare-bones hardware data simulator on an Arduino in a matter of minutes. This week we’ll look at a few simple ways to simulate data for on-screen gauges, readouts, dials and other uses. Your gauge program thinks it’s reading real sensor data. That frees you up to develop your gauge or another program on the Linux machine while you wait for the sensor to arrive. The good news is that you can “simulate” data with a minimal bit of code on the Arduino sensor device. It could be on the proverbial slow boat (or plane) from China or something. Occasionally the sensor isn’t available yet. A companion program, on Linux display machine, can suck in the data and do something like spin the needle of an on-screen analog gauge according to the sensor readings.
We read the sensor, scale the value to something practical, then print the data out to the USB port.
Capturing real-world measurements with a sensor and an Arduino microcontroller, then pushing those readings over to a Linux computer for display on an analog gauge program or other usage is fairly common now.
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