There are many project documents available within the site; here's a simple summary.
Original author: https://github.com/skuep/AIOC
Domestic version of Liuchang Square: https://oshwhub.com/infinite_future/aioc_easyeda
Essentially, it uses an STM32 to simulate all the functions, which appears as a CM108 audio device on both computers and phones. It is designed to work with Direwolf's new CM108 PTT control scheme.
The serial port on the handheld device will transmit data to the computer, which can then be used with CHIRP or other software to read and write frequencies.
The author's latest firmware includes a virtual PTT (Private Talk) function. After researching, I used the provided script to enable this feature. The basic principle is to activate PTT when audio data is detected in the cache. This approach is suitable for software like APRSDroid and Rattlegram that haven't been specifically optimized for this project.
Here are a few common pitfalls to watch out for during replication:
2.5mm and 3.5mm connectors are easy to solder, but they can melt due to high temperatures. It's important to quickly insert and remove them. I once melted the black plastic at the front of a 2.5mm connector during soldering, which broke the audio connection inside my UV5Rmini. Eventually, I had to disassemble it to pull it out from the other end.
The spacing and length of the K-head were not easy to control during welding. The author's suggestion was to use the 3D-printed support frame provided in the project, or to use a K-head without a hand-held device. I used the latter, and it worked fine.
I had some difficulty flashing the firmware using dfu on Windows, and then I followed this guide.IssueI switched to a new Linux device and haven't experienced any further issues.
When configuring features using a Python script, as shown above, I also switched to a Linux environment.
When I wrote this post, I discovered that the author had updated the firmware to version 1.4+, which included several adjustments and enhancements. However, since I am using a domestic 1.1 version of the hardware, I should not be able to use the new firmware features. But there is also an "Hu Fox Mode" that automatically sends fixed messages using Morse code, which I will try later.
If I can't replicate it, but am interested, I could buy a finished product. The ones available on Xianyu are a bit expensive, but mine is cheaper. Maybe my skills are even better than those selling for more! I hope not to take business away from others.
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