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++---------------------------+-----------------+-----------------+-------------++
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+---------------------------+-----------------+-----------------+-------------+
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//=====< 2021-06-09T05:14:14+00:00 >===============================================\\
|| ||
|| あの時だ！ :D ||
|| ||
|| == INTRO == ||
|| ||
|| I want to keep this one short and straight to the point. I built a RPi ||
|| controller for my Yaesu VX-7R handheld so it can activate the PTT and ||
|| transmit audio without human interaction. This project was the result of ||
|| an experiment I had seeing if my handheld could work as a POCSAG ||
|| transmitter. It didn’t work because the VX-7R doesn't support transmitting ||
|| data at 9600 baud. More or less it took the 2FSK coming from the audio ||
|| source and modulated it as NFM so in short, no beans… :/ ||
|| ||
|| Not to throw away a mostly working product I re-purposed my failed ||
|| experiment so it can be a fake number station or something that can ||
|| transmit automated messages like the weather or time. The fun part is I ||
|| was able to do all of this using a bash script so there was no need to ||
|| over complicate this project! :D ||
|| ||
|| ||
|| == YAESU VX-7R 2.5MM JACK == ||
|| ||
|| Yaesu handhelds use a 4 point 2.5mm jack for voice, speaker and data. ||
|| I recycled a broken hand mic while building this so below is the wire ||
|| coloring correlation and diagram for this jack. Wire colors may vary so ||
|| always double check with a multimeter. ||
|| ||
|| ||
|| +--+ GND MIC DATA SPEAKER ||
|| | +---------+---------+---------+ ||
|| | | | | +----+ ||
|| | | | | | | ||
|| | | | | +----+ ||
|| | +---------+---------+---------+ ||
|| +--+ ||
|| ||
|| +---------------------+ ||
|| | FUNCTION | COLOR | ||
|| +---------------------+ ||
|| | GND --> BRAID | ||
|| | MIC --> WHITE | ||
|| | DATA --> BLUE | ||
|| | SPEAKER --> RED | ||
|| +---------------------+ ||
|| ||
|| ||
|| == RPi SCHEMATIC == ||
|| ||
|| For this radio’s PTT to be activated Mic needs a 2.2K ohm resistance to ||
|| ground. Voice is also being carried over the same line while this ||
|| resistance is applied so to create this a parallel circuit is needed. ||
|| This took some creativity to make work because the RPi audio ground and ||
|| RPi ground are on the same circuit and because I was using a NPN I had to ||
|| fudge the RPi’s audio in to keep it from shorting. IE, I flipped the RPi’s ||
|| audio wires so the RPi’s audio line is going into the Yaesu’s ground and ||
|| vise versa. Below is schematic for this circuit. ||
|| ||
|| ||
|| RPi -> Yaesu VX-7r ||
|| +-----------------------------------------------------------------+ ||
|| | +------+ | ||
|| | +----------------+---------------+PI GND| | ||
|| | | | +------+ | ||
|| | | | | ||
|| | | ++\| 440Ω +----------+ | ||
|| | | +--+/\/\/\+--+PI GPIO 17| | ||
|| | | + <| +----------+ | ||
|| | | | | ||
|| | | | 2.2KΩ | ||
|| | | + /\/\/\+ | ||
|| | | +------------+ | +--------------------+ | ||
|| | | |PI AUDIO OUT+---------+-------+VX-7R MIC WHITE WIRE| | ||
|| | | +------------+ +--------------------+ | ||
|| | | | ||
|| | +-----------------------------+ | ||
|| | | | ||
|| | +------------+ | +--------------------+ | ||
|| | |PI AUDIO GND+-------------------+VX-7R GND BRAID WIRE| | ||
|| | +------------+ | +--------------------+ | ||
|| | | | ||
|| | +----------+ | | ||
|| | |PI MIC GND+------------------+ | ||
|| | +----------+ | ||
|| | | ||
|| | +---------+ +--------------------+ | ||
|| | |PI MIC IN+----------------------+VX-7R AUDIO RED WIRE| | ||
|| | +---------+ +--------------------+ | ||
|| +-----------------------------------------------------------------+ ||
|| ||
|| ||
|| == BASH SCRIPT == ||
|| ||
|| Here’s the bash script I used to control the Yaesu VX-7R. Included are ||
|| a few examples such as using CW to broadcast your call sign, espeak to ||
|| read words out loud, and how play a wav audio file. ||
|| ||
|| ||
|| tx.sh ||
|| +-----------------------------------------------------------------------------+ ||
|| | #!/bin/bash | ||
|| | | ||
|| | ####################################################### | ||
|| | # FILE: tx.sh # | ||
|| | # AUTHOR: NOTPIKE WU7ANG # | ||
|| | # LICENSE: MIT # | ||
|| | # FUNCTION: RPI TX SCRIPT FOR YAESU VX-7R # | ||
|| | # # | ||
|| | # ==REQUIRED SOFTWARE== # | ||
|| | # ~:$ sudo apt update # | ||
|| | # ~:$ sudo apt install cw espeak-ng # | ||
|| | ####################################################### | ||
|| | | ||
|| | | ||
|| | ############ VARIABLES ############ | ||
|| | | ||
|| | CALLSIGN="AB7CDE" | ||
|| | PHO_CALLSIGN="Alpha Brovo 7 Charlie Delta Echo" | ||
|| | TEST_SENTENCE="The Quck Brown Fox" | ||
|| | GPIO=17 | ||
|| | | ||
|| | trap ctrl_c INT | ||
|| | | ||
|| | | ||
|| | ############ FUNCTIONS ############ | ||
|| | | ||
|| | ## Trap function for ctrl_c, kills PTT | ||
|| | function ctrl_c() { | ||
|| | printf "\n\n##STOPING##\n\n" | ||
|| | tx_off | ||
|| | exit | ||
|| | } | ||
|| | | ||
|| | ## TX ON | ||
|| | function tx_on() { | ||
|| | ## Set GPIO to high | ||
|| | echo "1" > /sys/class/gpio/gpio$GPIO/value | ||
|| | } | ||
|| | | ||
|| | ## TX OFF | ||
|| | function tx_off() { | ||
|| | ## Set GPIO to low | ||
|| | echo "0" > /sys/class/gpio/gpio$GPIO/value | ||
|| | } | ||
|| | | ||
|| | ## Numbers Station | ||
|| | function numbers() { | ||
|| | MAX_COUNT=10 | ||
|| | COUNT=1 | ||
|| | | ||
|| | espeak-ng -g 40 "NUMBERS" 2> /dev/null | ||
|| | | ||
|| | while [ "$COUNT" -le $MAX_COUNT ] | ||
|| | do | ||
|| | NUMBER=$(( 1 + RANDOM %100 )) | ||
|| | echo $NUMBER | espeak-ng -g 40 2> /dev/null | ||
|| | let "COUNT += 1" | ||
|| | done | ||
|| | } | ||
|| | | ||
|| | ## Date Time | ||
|| | function date_time() { | ||
|| | NOW=$(date "+%A, %B %d, %Y, Time %H %M") | ||
|| | echo "Today is $NOW" | espeak-ng -g 40 2> /dev/null | ||
|| | } | ||
|| | | ||
|| | ## WAV File | ||
|| | function play_wav() { | ||
|| | aplay /home/pi/piano2.wav | ||
|| | } | ||
|| | | ||
|| | | ||
|| | ############ INIT ############ | ||
|| | | ||
|| | ## Set GPIO17 to out | ||
|| | if [ ! -d "/sys/class/gpio/gpio$GPIO" ]; then | ||
|| | echo "$GPIO" > /sys/class/gpio/export | ||
|| | echo "out" > /sys/class/gpio/gpio$GPIO/direction | ||
|| | fi | ||
|| | | ||
|| | | ||
|| | ############ MAIN ############ | ||
|| | | ||
|| | ## TX ON | ||
|| | tx_on | ||
|| | | ||
|| | | ||
|| | ## Callsign | ||
|| | #echo $PHO_CALLSIGN | espeak-ng -g 20 2> /dev/null | ||
|| | echo $CALLSIGN | cw -w 25 -t 1200 2> /dev/null | ||
|| | | ||
|| | ## Voice Example | ||
|| | echo $TEST_SENTENCE | espeak-ng -g 4 2> /dev/null | ||
|| | | ||
|| | ## Date Time Example | ||
|| | date_time | ||
|| | | ||
|| | ## Numbers Station Example | ||
|| | numbers | ||
|| | | ||
|| | ## WAV Example | ||
|| | play_wav | ||
|| | | ||
|| | ## Close | ||
|| | espeak-ng -g 4 -p 25 "END OF LINE" 2> /dev/null | ||
|| | | ||
|| | | ||
|| | ## TX OFF | ||
|| | tx_off | ||
|| +-----------------------------------------------------------------------------+ ||
|| ||
|| DOWNLOAD: tx.sh ||
|| IMG: rpi_yaesu_proto.jpg ||
|| IMG: rpi_yaesu.jpg ||
|| VIDEO: yaesu_rpi_example.mp4 ||
|| ||
|| ||
|| == Conclusion == ||
|| ||
|| Can’t wait to keep adding onto this project. I hope to be able to pipe ||
|| the RX audio into the Rpi and do more advanced stuff such as remote ||
|| control via DTMF for example. Hopefully you found this write up to be ||
|| useful and happy hacking! :D ||
|| ||
|| ||
|| == Update == ||
|| There’s now a Python port available available on my Github! :D ||
|| https://github.com/notpike/Hambone ||
|| ||
|| Expanding from where I left off, I added RX capability as well as porting ||
|| over a DTMF decoder that was origionaly written by Alijamaliz. ||
|| Right now it’s capable of listening for DTMF commands and will preform ||
|| actions such as reading the Weather, Time, and Date with Google’s Text ||
|| To Speech API and can preform an Echo Test by recording what it can hear ||
|| then playing it back. My most resent work can be found in the dev branch ||
|| in the repo. ||
|| ||
|| -- NotPike ||
|| ||
\\=================================================================================//
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\ ^__^
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U ||----w |
|| ||