Initial commit, migrated repo

README.md

@@ -1,3 +1,54 @@
 # RaspiQRP
 
-Making a raspberry pi zero 2 w into a QRP.
+This is a project that takes:
+
+* an SDR stick
+* a Raspberry Pi Zero 2 W
+* an USB audio card
+* some wires, indicators and screens
+* an RF amplifier
+
+and turns them into a full-fledged QRP!
+
+Currently there is no prototype, yet there is a plan present, which is good.
+
+The total cost of this device seems to be around 90€, while the cheapest QRP I found on Aliexpress is 100€.
+This difference might seem insignificant, but I bet that you have at least 70% of the supplies needed somewhere in your shack.
+The screens, buttons and leds are absolutely replaceable, but you'll need to tweak the code a it.
+
+As of right now, the planned device will be composed of:
+
+## 1. Raspberry Pi Zero
+<img src="https://cdn.littlebird.com.au/images/files/000/032/722/large/LB-00152.jpg?1535774731" alt="raspi"  width="200px" align="left">
+
+<ul>
+	<li> To take input from a potentiometer(encoder) in order to shift the frequency that we want to TX/RX.</li>  
+	<li> To control the RTL-SDR stick and pipe the audio to the speaker, through the USB audio card.</li>  
+	<li> To stream audio from the microphone, and pipe it to <a href="https://github.com/F5OEO/rpitx">rpitx(this project is really cool)<sup>1</sup></a> which then will get amplified using the amp.</li>  
+</ul>
+<sub>1. Please do read about this project, as it is vital stepping stone for this one.</sub>
+<br><br>  
+<br><br> 
+<br><br> 
+  
+
+## 2. Arduino TM4638 board
+<img src="https://www.elektro-hofman.cz/_obchody/elektro-hofman.shop5.cz/prilohy/39/pametovy-modul-spi-na-sd-kartu-pro-arduino.jpg.big.jpg" width="200px" alt="TM4638" align="left"/>   
+
+<ul>
+	<li> Using <a href="https://github.com/gavinlyonsrepo/TM1638plus_RPI">this library</a>.</li>
+	<li> To spare us of the pain of wiring an LCD.  </li>
+	<li> View the current frequency we're at.  </li>
+	<li> To let us change the bands, using the 8 buttons on the bottom. </li>  
+	<li> Indicate states of the device using the LEDs.  </li>
+</ul>
+
+	 
+<br><br>
+<br><br>
+<br><br>
+
+# Wiring
+![Wiring image](./wiring/wiring_bb.png)
+Sorry in advance for the trashy diagram, but this is my first ever attempt at wiring diagrams. The rtl-sdr and the audio card need to be put in the usb port, using a hub of some sort.
+

TODO.md

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+* [x] implement ssb
+* [x] create main.py
+* [x] eat dinner
+* [ ] start working on an actual raspberry pi
+* [ ] get all parts needed
+* [x] calculate the entire cost, so you can boast that it's probably two-three times cheaper than the cheapest QRP out there
+* [ ] write the code for the screen/leds/buttons
+* [ ] wire rpitx and the sdr stick to use the same frequency and mod 
+* [ ] wire them both to the potentiometer
+* [ ] get the frequency to show on the screen
+* [ ] wire(and make) a PTT button 
+* [ ] make LEDs flash for tx and rx
+* [ ] connect mic and speaker respectively to rpitx and the rtlsdr
+* [ ] fix the inevitable audio issues
+* [ ] fix them again
+* [ ] one last time i swear
+* [ ] if everything works as expected, add more modulations
+* [ ] program the buttons to change modulations
+* [ ] audio issues
+* [ ] mayyybe try to make it look pretty, with a box or something
+* [ ] **you need a fan for the amplifier BTW**

modulations/ssb.sh

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+#!/bin/sh
+
+# Pin logic
+#selecting pin
+
+GPIO=26
+
+# "Prepare" it, whatever that means, I just copied it from SO
+if [ ! -d /sys/class/gpio/gpio${GPIO} ]; then
+  echo "${GPIO}" > /sys/class/gpio/export
+fi
+echo "in" > /sys/class/gpio/gpio"${GPIO}"/direction
+
+
+
+# old line
+#(while true; do cat sampleaudio.wav; done)
+
+while true; do
+  	if [ 1 == "$(</sys/class/gpio/gpio"${GPIO}"/value)" ]; then
+
+		# REMOVE THIS
+		echo "Not pressed"
+
+  	else
+
+# do arecord -l or arecord -L to find your audio card and change hw:0,7 to the corresponding value
+		arecord -q -f cd -r 44100 -c2 -D hw:0,7 -t raw | csdr convert_i16_f \ | csdr fir_interpolate_cc 2 | csdr dsb_fc \ | csdr bandpass_fir_fft_cc 0.002 0.06 0.01 | csdr fastagc_ff \  | sudo ./sendiq -i /dev/stdin -s 96000 -f "$1" -t float
+# maybe i just need to extract this command and put it in a subprocess... 🤔
+
+	fi
+	sleep .5
+done
+
+# this should work
+# screen will probably be operated using python, so all we need to do there is to killall ssb.sh, then run a new one with new freq async subproc
+# usage: bash ssb.sh "freq"