Class: Mcp3008Pi

Inherits:
Object
  • Object
show all
Defined in:
lib/mcp3008pi.rb

Instance Method Summary collapse

Constructor Details

#initialize(pin: 0, pins: [pin], clock: 18, dout: 23, din: 24, cs: 25) ⇒ Mcp3008Pi

Returns a new instance of Mcp3008Pi.



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# File 'lib/mcp3008pi.rb', line 16

def initialize(pin: 0, pins: [pin], clock: 18, dout: 23, din: 24, cs: 25)

  @adc_pins = pins

  a = [clock, dout, din, cs]
  unexport_all a
  
  @clock = PiPiper::Pin.new :pin => clock, :direction => :out
  @adc_out = PiPiper::Pin.new :pin => dout
  @adc_in = PiPiper::Pin.new :pin => din, :direction => :out
  @cs = PiPiper::Pin.new :pin => cs, :direction => :out
  
  at_exit do
    
    # to avoid "Device or resource busy @ fptr_finalize - /sys/class/gpio/export"
    # we unexport the pins we used
    
    unexport_all a
  end      

end

Instance Method Details

#read ⇒ Object 



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# File 'lib/mcp3008pi.rb', line 38

def read()
  
  a = @adc_pins.map {|pin| read_adc(pin, @clock, @adc_in, @adc_out, @cs) }
  return a.first if a.length == 1
  
  return a
end