Class: Pifan::Process

Inherits:
Object
  • Object
show all
Includes:
Logging
Defined in:
lib/pifan/process.rb

Instance Method Summary collapse

Methods included from Logging

included, #logger

Constructor Details

#initialize(parameters) ⇒ Process

Returns a new instance of Process.



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# File 'lib/pifan/process.rb', line 11

def initialize(parameters)
  @control_pin = parameters[:control_pin]
  @refresh_time = parameters[:refresh_time]
  @pwm_frequency = parameters[:pwm_frequency]
  @temp_steps = parameters[:temperature_steps]
  @speed_steps = parameters[:speed_steps]

  RPi::GPIO.set_numbering :bcm
  RPi::GPIO.setup @control_pin, as: :output, initialize: :low
  @fan = RPi::GPIO::PWM.new(@control_pin, @pwm_frequency)
  @fan.start(0)
end

Instance Method Details

#cleanup ⇒ Object 



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# File 'lib/pifan/process.rb', line 52

def cleanup
  RPi::GPIO.clean_up
end

#start ⇒ Object 



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# File 'lib/pifan/process.rb', line 24

def start
  hyst = 1
  cpu_temp_old = 0
  fan_speed_old = 0

  # Run at full speed for 2 secs to avoid not starting at small speed
  @fan.duty_cycle = 100
  sleep 2

  loop do
    cpu_temp_current = cpu_temp
    logger.debug("New temperature: #{cpu_temp_current}")

    if (cpu_temp_current - cpu_temp_old).abs > hyst
      fan_speed_current = fan_speed
      if fan_speed_current != fan_speed_old
        logger.debug("New fan speed: #{fan_speed_current}")
        @fan.duty_cycle = fan_speed_current
        fan_speed_old = fan_speed_current
      end

      cpu_temp_old = cpu_temp_current
    end

    sleep @refresh_time
  end
end