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==What==
==What==
Our HDMI switches provide only a classic infrared remote control, to interface with [[Slackomatic]] we replaced the infrared receiver with a few wav files and a small custom-built level shifter.
Our HDMI switches provide only a classic infrared remote control, to interface easier with [[Slackomatic]] we replaced the infrared receiver with a few wav files and a small custom-built level shifter.
 


==How==
==How==
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The files were post-edited using Audacity and now we can simply play them and attach the audio out from the Raspberry Pi directly to the HDMI switch IR receiver port with a small piece of voltage converter logic in between.
The files were post-edited using Audacity and now we can simply play them and attach the audio out from the Raspberry Pi directly to the HDMI switch IR receiver port with a small piece of voltage converter logic in between.


==Data==
==Data==
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# [[:Datei:Input_hdmi4.wav|HDMI 4]]
# [[:Datei:Input_hdmi4.wav|HDMI 4]]
# [[:Datei:Input_hdmi5.wav|HDMI 5]]
# [[:Datei:Input_hdmi5.wav|HDMI 5]]
[[Datei:Wandlerumgs.jpg|345px|right]]


==Schematic==
==Schematic==
Circuit


Circuit (n.b: the supply voltage is actually 3.3V instead of the shown 5V. As NPN transistors we took 2x BC547B from Metalab's [[Bauteilsortiment#Transistoren|electronic parts stock]]):
the supply voltage is actually +3.3V instead of the shown +5V.  


[[Datei:Wandlerumgs.jpg|miniatur,left]]
As NPN transistors we took 2x BC547B from Metalab's fine [[Bauteilsortiment#Transistoren|electronic parts stock]]).


<br clear=all>
==Pictures==
[[Datei:HDMI whisperer.jpg]]


[[Datei:HDMI whisperer.jpg]]
 
__NOTOC__
 
[[Kategorie:Projekte]]

Version vom 22. November 2015, 16:45 Uhr

Language: English
Subpages:
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HDMI whisperer
HDMI whisperer.png
Gestartet: 21.11.2015
Involvierte: User:Phaer User:m68k User:Pk
Status: active
Beschreibung: It's a custom-built remote control interface for our cheap Chinese HDMI switches
Shutdownprozedur:
Zuletzt aktualisiert: 21.11.2015

What

Our HDMI switches provide only a classic infrared remote control, to interface easier with Slackomatic we replaced the infrared receiver with a few wav files and a small custom-built level shifter.


How

The cheap Sindax 5 to 1 HDMI switches we got have an IR remote control that comes with a 3.5mm audio connector to plug in a cape with a TSOP383.

This receiver was plugged into the audio port of a laptop and the generated audio was captured.

That gave us 5 different audio files.

The files were post-edited using Audacity and now we can simply play them and attach the audio out from the Raspberry Pi directly to the HDMI switch IR receiver port with a small piece of voltage converter logic in between.


Data

Wav files with the recorded IR commands:

  1. HDMI 1
  2. HDMI 2
  3. HDMI 3
  4. HDMI 4
  5. HDMI 5
Wandlerumgs.jpg


Schematic

Circuit

the supply voltage is actually +3.3V instead of the shown +5V.

As NPN transistors we took 2x BC547B from Metalab's fine electronic parts stock).


Pictures

HDMI whisperer.jpg