Differences

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--- squawk [2016-10-10 15:54] – rob
+++ squawk [2017-01-10 21:01] – [/home/pi/squawk.py] tim
@@ Line 1: / Line 1: @@
-====== Audio Alerts ======
+====== Audio Alerts (squawk) ======
-Traditionally this was handled by doorpi. However, that pi has too much stuff hanging off it, and was very out of date. There was an issue of a loud pop occurring before any sound played, this was fixed in later firmware updates. Rob has now dedicated a pi (original B) for the purpose and documents it thus:
+Traditionally this was handled by doorpi. However, that pi has too much stuff hanging off it, and was very out of date. There was an issue of a loud pop occurring before any sound played, this was fixed in later firmware updates. Rob has purchased a pi (original B), amplifier and speakers for the purpose and documents them thus:
 ===== Usage =====
@@ Line 19: / Line 19: @@
 Text-to-speech message (with a clear airport/transit chiming sound):
 <code>
-mosquitto_pub -h mqtt -t 'sound/g1/speak' -m "Good evening, my sensors indicate that the laser cutter may be on fire."
+mosquitto_pub -h mqtt -t 'sound/g1/announce' -m "Good evening, my sensors indicate that the laser cutter may be on fire."
 </code>
 **Theory:** You could direct sound two only two rooms at once by playing the left or right channel only. By default mpg123 is called with the -m option to ensure that the output is mono and thus the same sound comes out every speaker.
+===== Adding new sounds =====
+Use the web file browser at http://squawk.hacklab:8080/.
 ===== Raspbian =====
@@ Line 180: / Line 184: @@
         speak(msg.payload)
-    if msg.topic == 'display/doorbot/intercom':
+    if msg.topic == 'access/entrance/request':
-        if msg.payload == '1' and status == 'closed':
+        if status == 'closed':
             play('doorbell.mp3')
@@ Line 395: / Line 399: @@
 There are four speakers connected, two per channel, located in each of the rooms on the ceiling. The speakers are 8 Ohm moisture resistant cheap ceiling speakers that have exceeded expectations and produce a surprisingly full sound. This opens up the potential for using them for background music in the future (e.g. via MPD).
+==== Raspberry Pi ====
+Standard pi other than having some wires soldered on the underside of the board to connect to the 3.5mm audio jack. Powered via the header rather than USB.
+==== Amplifier ====
+  * TPA3116
+  * "100 W"
+  * 12-24v (more volts = more power)
+  * Volume pot
+  * 3-pin header input or 3.5mm socket
+Audio is input via the 3-pin header.
+Power is input on the centre screw terminal, with left and right speaker outputs either side.
 ==== Power Supply ====