class Frankenpins::RotaryEncoder
Public Class Methods
new(options)
click to toggle source
# File lib/frankenpins/rotary_encoder.rb, line 9 def initialize(options) @pin_a, @pin_b = create_pins_from_options_hash!(options) @pin_a.watch { update } @pin_b.watch { update } @position = 0 @last_val = 0 end
Public Instance Methods
update()
click to toggle source
# File lib/frankenpins/rotary_encoder.rb, line 19 def update @pin_a.read msb = @pin_a.value @pin_b.read lsb = @pin_b.value encoded = (msb << 1) | lsb; sum = (@last_val << 2) | encoded; if(sum == 0b1101 || sum == 0b0100 || sum == 0b0010 || sum == 0b1011) @position += 1 raise_event :changed, @position, :clockwise end if(sum == 0b1110 || sum == 0b0111 || sum == 0b0001 || sum == 0b1000) @position -= 1 raise_event :changed, @position, :anticlockwise end @last_val = encoded end
when(event_name, &block)
click to toggle source
# File lib/frankenpins/rotary_encoder.rb, line 41 def when(event_name, &block) send(event_name).register(&block) end
Private Instance Methods
create_pins_from_options_hash!(options)
click to toggle source
# File lib/frankenpins/rotary_encoder.rb, line 46 def create_pins_from_options_hash!(options) options[:pull] = :up unless options.has_key?(:pull) pin_a_num = options.delete(:pin_a) pin_b_num = options.delete(:pin_b) pin_a = Frankenpins::Pin.new(options.merge(:pin => pin_a_num)) pin_b = Frankenpins::Pin.new(options.merge(:pin => pin_b_num)) return pin_a, pin_b end