Class: Resistor::BasicResistor

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(arg, options = {}) ⇒ Resistor::BasicResistor #initialize(arg, options = {}) ⇒ Resistor::BasicResistor

Initializes a new BasicResistor object. Both the ohm and code parameter are optional, but at least one of them must be supplied.

Overloads:

  • #initialize(arg, options = {}) ⇒ Resistor::BasicResistor

    Parameters:

    • arg (Integer, Float) —

      A resistance value

  • #initialize(arg, options = {}) ⇒ Resistor::BasicResistor

    Parameters:

    • arg (Array<Symbol>, Array<String>) —

      A color code

Parameters:

  • options (Hash) (defaults to: {}) —

    a customizable set of options

Options Hash (options):

  • :tolerance(5.0) (Integer, Float)
  • :band_number(4) (Integer)

Raises:

  • (ArgumentError) —

    The ohm or code parameter must be supplied. Error raised if neither parameter is supplied.



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# File 'lib/resistor/basic_resistor.rb', line 19

def initialize(arg, options = {})
  default = Resistor::Options.new
  options[:tolerance] ||= default.tolerance
  options[:band_number] ||= default.band_number

  case arg
  when Integer, Float
    @ohm = arg.to_f
    @code = Resistor::ColorCode.encode(@ohm, options)
    @tolerance = options[:tolerance]
  when Array
    @code = arg.map(&:to_sym)
    @ohm = Resistor::ColorCode.decode(@code, options)
    @tolerance = Resistor::ColorCode::TOLERANCE[@code[-1].to_sym]
  else
    raise ArgumentError
  end
end

Instance Attribute Details

#code ⇒ Object

Returns the value of attribute code.



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# File 'lib/resistor/basic_resistor.rb', line 4

def code
  @code
end

#ohm ⇒ Object

Returns the value of attribute ohm.



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# File 'lib/resistor/basic_resistor.rb', line 4

def ohm
  @ohm
end

#tolerance ⇒ Object (readonly)

Returns the value of attribute tolerance.



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# File 'lib/resistor/basic_resistor.rb', line 4

def tolerance
  @tolerance
end

Instance Method Details

#+(other) ⇒ Resistor::CombinedResistor Also known as: -

Calculates a series combined resistance value.

Parameters:

Returns:



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# File 'lib/resistor/basic_resistor.rb', line 62

def +(other)
  Resistor::CombinedResistor.new(@ohm + other.ohm)
end

#/(other) ⇒ Resistor::CombinedResistor Also known as: |

Calculates a parallel combined resistance value.

Parameters:

Returns:



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# File 'lib/resistor/basic_resistor.rb', line 71

def /(other)
  Resistor::CombinedResistor.new(1 / (1 / @ohm + 1 / other.ohm))
end

#e12? ⇒ Boolean

Whether or not the resistance value is the E12 series.

Returns:

  • (Boolean) 


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# File 'lib/resistor/basic_resistor.rb', line 79

def e12?
  num0 = Resistor::ColorCode::DIGIT[@code[0]]
  num1 = Resistor::ColorCode::DIGIT[@code[1]]
  Resistor::ColorCode::E12_SERIES.each do |key, val|
    if num0 == key
      return true if val.any? { |e| e == num1 }
    end
  end
  return false
end

#e24? ⇒ Boolean

Whether or not the resistance value is the E24 series.

Returns:

  • (Boolean) 


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# File 'lib/resistor/basic_resistor.rb', line 93

def e24?
  num0 = Resistor::ColorCode::DIGIT[@code[0]]
  num1 = Resistor::ColorCode::DIGIT[@code[1]]
  Resistor::ColorCode::E24_SERIES.each do |key, val|
    if num0 == key
      return true if val.any? { |e| e == num1 }
    end
  end
  return false
end

#e48? ⇒ Boolean

Whether or not the resistance value is the E48 series. Always returns false if the number of bands is 4.

Returns:

  • (Boolean) 


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# File 'lib/resistor/basic_resistor.rb', line 108

def e48?
  return false if @code.size == 4
  num = [
    Resistor::ColorCode::DIGIT[@code[0]],
    Resistor::ColorCode::DIGIT[@code[1]],
    Resistor::ColorCode::DIGIT[@code[2]],
  ].join.to_i
  Resistor::ColorCode::E48_SERIES.any?{|n| n == num }
end

#e96? ⇒ Boolean

Whether or not the resistance value is the E96 series. Always returns false if the number of bands is 4.

Returns:

  • (Boolean) 


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# File 'lib/resistor/basic_resistor.rb', line 122

def e96?
  return false if @code.size == 4
  num = [
    Resistor::ColorCode::DIGIT[@code[0]],
    Resistor::ColorCode::DIGIT[@code[1]],
    Resistor::ColorCode::DIGIT[@code[2]],
  ].join.to_i
  Resistor::ColorCode::E96_SERIES.any?{|n| n == num }
end