The world of Arduino doesn't have to be all sensors and robots - you can also make things for younger people to enjoy, and one example of this is by Arduino forum member twelch with their petrol pump. It's a neat design that uses LED numeric displays with I2C backpacks to display the data found on a typical pump.
The end user then "fills" their toy car with the required fuel, with the price and volume increasing as expected, with the flow being activated by a magnet at the fuel point in the toy car which is detected by a sensor at the end of the filling hose. You can even adjust the fuel price at whim just like the real versions.
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