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Bluetooth PTT switch for ham radio transmitters like Baofeng UV-5R.
Board helps to control transmitter from PC.
Testing of UART interface showed unstable connection. During transmit via UART an usb-ttl chip periodically crashes and stops working. Cause is some radio strong interference on USB cable. So Bluetooth serial protocol stack (SSP) chosen instead.
Host -> (Bluetooth) -> Esp-32 Arduino -> Relay -> Transmitter PTT button
Hardware
hcitool scanfrom hamptt import open_ptt
with open_ptt(bt_addr="A0:B1:C2:D3:E4:F5") as ptt:
ptt.begin()
# I.e. play message to transmitter or something else
ptt.end()
Host PC machine
Python 3.8
Bluetooth's libs (required for pybluez)
sudo apt-get install bluez libbluetooth-dev
Pip
python3 -m pip install "hamptt[bt]"
Esp32
Upload sketch to your esp-32 via PlatformIO
NOTE! Check your board config in platformio.ini (see: https://platformio.org/)
pio run -t upload
Connect pins Esp-32 to relay
Connect relay and audio, for Baofeng UV-5R it looks like:
NOTE: You can rebuild your hands-free cable or buy another one
Build and install
pip3 uninstall hamptt
rm -rf dist && poetry build && pip3 install ./dist/*.whl
Publish
Prepare
poetry config repositories.testpypi https://test.pypi.org/legacy/
poetry config pypi-token.testpypi <TOKEN>
poetry config repositories.pypi https://upload.pypi.org/legacy/
poetry config pypi-token.pypi <TOKEN>
Publish
poetry publish --build -r testpypi
poetry publish --build -r pypi
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