Class: PwmPin

Inherits:
Object
  • Object
show all
Defined in:
lib/pwm_pin.rb

Constant Summary collapse

PI_BLASTER_PATH = 
"/dev/pi-blaster"

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(pin_num) ⇒ PwmPin

Returns a new instance of PwmPin.



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# File 'lib/pwm_pin.rb', line 7

def initialize(pin_num)
  @pin_num = pin_num
  @pwm_file = File.open("#{ PI_BLASTER_PATH }", "w")

  pwm_write(0)
end

Instance Attribute Details

#pb_val ⇒ Object (readonly)

Returns the value of attribute pb_val.



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# File 'lib/pwm_pin.rb', line 3

def pb_val
  @pb_val
end

#pin_num ⇒ Object (readonly)

Returns the value of attribute pin_num.



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# File 'lib/pwm_pin.rb', line 3

def pin_num
  @pin_num
end

#pwm_file ⇒ Object (readonly)

Returns the value of attribute pwm_file.



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# File 'lib/pwm_pin.rb', line 3

def pwm_file
  @pwm_file
end

#value ⇒ Object (readonly)

Returns the value of attribute value.



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# File 'lib/pwm_pin.rb', line 3

def value
  @value
end

Instance Method Details

#pwm_write(value) ⇒ Object

Writes PWM value to the specified pin Param value should be integer from 0 to 255



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# File 'lib/pwm_pin.rb', line 16

def pwm_write(value)
  @value = value

  # Calculates the pi-blaster required value between 0 and 1 inclusive
  @pb_val = pi_blaster_val(value)

  @pwm_file.write("#{ pin_num }=#{ @pb_val }\n")
  @pwm_file.flush
end

#release ⇒ Object 



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# File 'lib/pwm_pin.rb', line 26

def release
  @pwm_file.write("release #{ pin_num }\n")
  @pwm_file.flush
end