 noflo = require 'noflo'
 
 # @runtime noflo-nodejs
-# https://github.com/ev3dev/ev3dev/wiki/Using-Sensors
+# http://www.ev3dev.org/docs/sensors/lego-ev3-touch-sensor/
 # https://github.com/ev3dev/ev3dev/wiki/Using-the-Mindstorms-Sensor-Device-Class
 
 LOG_PREFIX = 'legoev3/TouchSensor:'
+ENC = { encoding: 'utf8' }
 
 class TouchSensor extends noflo.Component
   description: 'Detect touch events.'

      files = (file for file in files when file.slice(0, 6) isnt 'sensor')
      wanted = 'in' + port
      for file in files
        port_name = fs.readFileSync file + '/port_name'
        if port_name is wanted
          @base = file + '/value0'
          console.log "#{LOG_PREFIX} new base: #{@base}"
          break
    catch err
      console.log "#{LOG_PREFIX} readdir failed: #{err}"

    @inPorts.kick.on 'data', =>
      return if @in_read_file or @base is null
      @in_read_file = true
      new_value = parseInt (fs.readFileSync @base + '/value0', ENC)
      # Only send messages on change
      if new_value isnt @last_value
        @last_value = new_value
