Raspberry Pi PiCoolFAN4 User Manual page 15

PiCoolFAN4 Firmware Code 0x14 Print Date 10.11.2019
Ttemp and Tstep
Ttemp defines the temperature threshold to be used in the cooling profile.
Tstep defines the number of steps (temperature in degrees) it takes to increase/decrease fan speed to
the next range.
When used with a Hard cooling profile, Ttemp is simply the point at which the fan turns on/off. Tstep is
not used with Hard cooling profiles.
When used with a Mild cooling profile, the Ttemp is the center point at which the gradual fan changes
are based on, which works in conjunction with Tstep.
In the example below, the ttemp is on the center of temperature monitoring window and tstep is set to
1.
When the temperature moves one degree lower or one degree higher than ttemp, the fan runs at 50% of
its speed (lower noise). This is because tstep is set to 1.
If the temperature continuous to increase, the fan speed will increase 75% of its speed, as this is another
1 'step' as defined by tstep (which is set to 1). The fan will eventually run at 100% if the temperature
increases by another step.
The same works for decreasing temperature with the same steps/range, lowering fan speed until it
eventually turns off the fan when not required. This is ideal for minimizing noise output.
The user can change the ttemp to any value, effectively moving the window up or down in the
temperature scale.
Tstep can also be changed, to increase/decrease the window of temperature increase/decrease before
moving to the next fan speed.
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