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  1. It's official, my 9x R/C transmitter now listens to me. And to my surprise it does what I say. Here's a chatty conversation I had with my 9x today: So here's the story. A few weeks ago I was looking for a headset to hack into my open9x R/C transmitter so I could privately hear its telemetry voice messages. Then as fate would have it I came across a Xbox headset on eBay that had a microphone. And that was my undoing since it taunted me to make a voice recognition interface for my 9x transmitter. So a simple 1-hour project became a much bigger ordeal! But now that it is working I can enthusiastically say that a 9x with voice recognition is a really cool hack. First on the project list was to idenitfy some affordable voice recognition modules were available that I could interface to a Arduino. The $50USD EasyVR module is sold by a lot of shops and there's endless discussions about it. But I don't like following the crowds so I took a chance and ordered a $25 Chinese voice recognition module (sold by emartee.com and other China stores). This module was definitely a gamble since other than a video posted by a seller, there was zero internet discussions about it. I also purchased a Arduino Pro Mini CPU (they're only $6 on eBay). While this stuff was on the slow boat from China the custom PCB was created. It has a audio amp for the headset and some audio conditioning circuitry to improve the microphone's performance, which helps eliminate false voice recognition hits. The voice recognition module can respond to five commands and from my experiments the success rate is very good. Here's a photo of the installation: The graphic display at the top of the transmitter is a 128x64 OLED. These are about $15 from China/eBay shops. It interfaces to the Arduino using a i2c buss. The displayed images were created with Photoshop and then converted to bitmaps that were stored as data arrays in the Arduino code. I'm having a blast with the 9x's new voice recognition feature. If there is sufficient interest I'll publish the schematic and Arduino code. But creating useful documentation is a lot of work (and I have limited free time) so I'll need to see a good show of hands. So join the forum and post a "+1" to help motivate me to document the project's details.
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