Interrogator
test video
Test videos show proof of concept app (CFP_Ultra) running that detects, on a background thread, near ultra-high audio transmitted via the IoT desk lamp. Audio tones are generated from a html5 webkit sine oscillator synth in frequencies that represent the alphabet (18000Hz - 19950Hz). App listens for a stop bit 'a' before building the complete string of letters.
Latest at top.
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prototype
This is going to serve as the archive for the build of the interrogator and how it will inevitably change from the ideas behind its inception to the finished article.
The IoT lamp after removal of the LEDs and speaker enclosure reveals it's boards suspended inside silicon, making removal a bit tricky.
The first prototype has the IoT lamp excavated of its PCBs ( a CSR8630 and power board ) for later examination. Speakers and LEDs are wired up to a USB cable ( red/black = v+/v- and green/white audio+/audio- ). The speakers need an amplifier (they rated at 3w 8ohm each) so a kit ( KC5519 ) was bought from Jaycar. This takes the audio out ( mono ) from the Raspberry Pi 1 model B rev 2 ( running wheezy raspbian ). Audio is mix 01 mp3 from Laverna netlabel. Sound is good volume and clarity. Need to check the frequency response via laptop tone generator and freq detector app.
image above: PSU delivering 7.5v, IoT lamp with speakers, pre-amp and amp PCB and WheezyPi sending mp3 audio without distorting and at room level audio. Not running power to LEDs
image above: prototype one desklamp with phone and restraint/holder. Desklamp is unplugged (AC plug) and should remain as such while LEDs and speakers are powered by hidden batteries.
image above: prototype one desklamp with phone and restraint/holder. IoT lamp added with speakers playing test audio and LEDs powered and running at 7.5v @ 1.5a
image above: prototype one desklamp with phone and mount. Scenario created to determine responses as a critical object without any apparent audio or light functions.
image above: prototype app records near ultra-high frequency audio (18kHz-20kHz) parse string of letters transmitted by IoT lamp. Speakers transmitted 'U' at 19500 Hz.
images above: prototype app demonstrating minimal interface for debugging and invoking pop up messages to show an action taken place based upon near ultra high audio frequency received.
Overhead shot of the phone running Ultra app, IoT lamp, preamp and power circuitry, laptop running html5 synth page and DV camera. Used to film App01-test03.
Prototype app with graphical elements of scrolling background and dropping speaker/button. Graphics to indicate foreground distraction to background processes later announced via toast.
Audio generated by HTML5 synth.js that emits near ultra-high tones for the Ultra app to respond to. The online video host version seems to have cut all the frequencies above approximately 14kHz, possibly due to DV cam used. Note the artifacts centered at ~6kHz and ~13kHz.
Experimenting with the layout and elements to be presented in the video of the app and IoT lamp interacting. Heading towards a more retail shop floor style.
This version retains the direct focus of the IoT lamp and the phone, but is not very shop like.
This version is taken at night with the only light source being the IoT lamp.
A combination of shop floor scene with focus of lamp to phone.
UML Class Diagram of CFP_Ultra app.
