This is a unique solution to a very specific problem. The steampunk setup will tell you how far away the person/car on the other end is.
Via Raspberry Pi Blog:
When the family car is moving, a light turns on, and an antique electrical meter points to 30…20…10 to show the estimated minutes until the driver arrives. The movements of the car come in from a cellular Sinotrack OBD2 dongle pointed at a traccar server running on Raspberry Pi 3.
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