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README: Proofread fan control documentation
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README.md
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README.md
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@ -277,12 +277,11 @@ The thermostat implements a PID control loop for each of the TEC channels, more
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## Fan control
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Fan control is available for the thermostat revisions with integrated fan system. For this purpose four commands are available:
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Fan control commands are available for thermostat revisions with an integrated fan system:
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1. `fan` - show fan stats: `fan_pwm`, `abs_max_tec_i`, `auto_mode`, `k_a`, `k_b`, `k_c`.
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2. `fan auto` - enable auto speed controller mode, which correlates with fan curve `fcurve`.
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3. `fan <value>` - set the fan power with the value from `1` to `100` and disable auto mode. There is no way to disable the fan.
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2. `fan auto` - enable auto speed controller mode, where fan speed is controlled by the fan curve `fcurve`.
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3. `fan <value>` - set the fan power with the value from `1` to `100` and disable auto mode. There is no way to completely disable the fan.
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Please note that power doesn't correlate with the actual speed linearly.
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4. `fcurve <a> <b> <c>` - set coefficients of the controlling curve `a*x^2 + b*x + c`, where `x` is `abs_max_tec_i/MAX_TEC_I`,
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i.e. receives values from 0 to 1 linearly tied to the maximum current. The controlling curve should produce values from 0 to 1,
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as below and beyond values would be substituted by 0 and 1 respectively.
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5. `fcurve default` - restore fan curve settings to defaults: `a = 1.0, b = 0.0, c = 0.0`.
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4. `fcurve <a> <b> <c>` - set coefficients of the controlling curve `a*x^2 + b*x + c`, where `x` is `abs_max_tec_i/MAX_TEC_I`, a normalized value in range [0,1],
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i.e. the (linear) proportion of current output capacity used, on the channel with the largest current flow. The controlling curve is also clamped to [0,1].
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5. `fcurve default` - restore fan curve coefficients to defaults: `a = 1.0, b = 0.0, c = 0.0`.
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