VeloPopuli can drive a fan that speeds up as you go faster (or work harder), and a light coloured by your power zone. Settings → Fan & lights:
fan.desk_fan
{level}
{power}
{zone}
The fan follows speed, power or heart rate: off below one value and full at another (10 → 35 km/h by default). Test checks the connection.
Tested against simulated devices only so far.
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