Add random phrases when an optional pi camera detects motion.

Fix LED paths for more recent pi-image operating systems.

FossilOrigin-Name: 95bda0bf25a4c8760c07217545106e4a5116a2a6e01463d5189551eb83bfa0f7

theremin/lib/theremin.rb

@@ -8,6 +8,7 @@ require 'loggability'
 require 'gpio'
 require 'fluidsynth'
 require 'open3'
+require 'socket'
 
 
 # A class that coordinates GPIO events and translates
@@ -130,6 +131,12 @@ class Theremin
 
 		## ESpeak TTL options.
 		setting :espeak_flags, default: %w[ -k20 -v f5 -s 160 -a 150 ]
+
+		## Watch for camera motion?
+		setting :use_motion, default: false
+
+		## A list of phrases to randomly say when motion is detected.
+		setting :motion_messages, default: []
 	end
 
 
@@ -163,6 +170,9 @@ class Theremin
 	# An IO to stream to espeak.
 	attr_reader :speech_io
 
+	# A TCPServer for motion IPC
+	attr_reader :motion_socket
+
 	# Is this Theremin currently running?
 	attr_reader :running
 
@@ -181,10 +191,11 @@ class Theremin
 		self.chorus( self.class.chorus )
 		self.instrument( self.class.font_index, self.class.instrument_index )
 
+		self.speak( self.class.startup_message ) if self.class.startup_message
 		@threads << self.note_thread
 		@threads << self.gain_thread
+		@threads << self.motion_thread if self.class.use_motion
 		self.led( :green )
-		self.speak( self.class.startup_message ) if self.class.startup_message
 		self.log.warn "Waiting for interaction, or ctrl-c to exit."
 		@threads.map( &:join )
 	end
@@ -196,14 +207,15 @@ class Theremin
 		@running = false
 		self.pins.each {|pin| self.class.send( pin ).unexport rescue nil }
 		self.synth.socket.close
+		self.motion_socket.close
 		self.speech_io.close if self.speech_io && !self.speech_io.closed?
 		self.led( :red )
 	end
 
-    
-    #########
-    protected
-    #########
+
+	#########
+	protected
+	#########
 
 	### Measure pitch distance, and manage notes sent to the synth.
 	###
@@ -271,6 +283,23 @@ class Theremin
 	end
 
 
+	### Watch the motion fifo, say a random phrase when motion seen.
+	###
+	def motion_thread
+		phrases = self.class.motion_messages
+		return if phrases.empty?
+
+		@motion_socket = TCPServer.new( 62877 )
+		return self.running_thread do
+			client = @motion_socket.accept
+			self.log.info "Camera motion detected."
+			client.close
+			self.speak( phrases.sample )
+		rescue IOError
+		end
+	end
+
+
 	### Open a pipe to espeak, and wait on input.
 	## 
 	def setup_speech
@@ -375,11 +404,11 @@ class Theremin
 	def led( color )
 		case color
 		when :red
-			File.open( '/sys/class/leds/led0/brightness', 'w' ){|l| l.puts(0) }
-			File.open( '/sys/class/leds/led1/brightness', 'w' ){|l| l.puts(1) }
+			File.open( '/sys/class/leds/PWR/brightness', 'w' ){|l| l.puts(1) }
+			File.open( '/sys/class/leds/ACT/brightness', 'w' ){|l| l.puts(0) }
 		when :green
-			File.open( '/sys/class/leds/led0/brightness', 'w' ){|l| l.puts(1) }
-			File.open( '/sys/class/leds/led1/brightness', 'w' ){|l| l.puts(0) }
+			File.open( '/sys/class/leds/PWR/brightness', 'w' ){|l| l.puts(0) }
+			File.open( '/sys/class/leds/ACT/brightness', 'w' ){|l| l.puts(1) }
 		end
 	end