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Merge pull request #422 from alanbjohnston/master-b-p-s

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safe mode and beacon on/off for pacsat
master-b-p
Alan Johnston 1 week ago committed by GitHub
parent 8db0be76f4 7fbfb32309
commit a7a0805aab
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GPG Key ID: B5690EEEBB952194
12 changed files with 365 additions and 117 deletions
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3
.gitignore vendored
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@ -47,3 +47,6 @@ logt.txt
telem.txt.bk
failure_mode.txt
sim_mode_auto
direwolf-pacsatsim-tmp.conf
groundstation/direwolf-pacsat-tmp.conf
tlm.bin

45
config
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@ -324,6 +324,32 @@ if [ "$1" = "" ]; then
echo "Transmit beacon telemetry is ON"
fi
if [[ $(arecord -l | grep "USB Audio Device") ]] ; then
echo "USB Sound Card detected"
soundcard=1
else
echo "No USB Sound Card detected"
soundcard=0
fi
gpio -g mode 7 up
if [[ $(gpio -g read 7 | grep 0) ]] ; then
echo "FM TXC is present"
txc=1
else
echo "FM TXC not present"
txc=0
fi
timeout 1 rtl_test &> out.txt
if [[ $(grep "No supported" out.txt) ]] ; then
echo "No RTL-SDR detected"
rtl=0
else
echo "RTL-SDR detected"
rtl=1
fi
echo
echo -e "Current sim.cfg configuration file:"
# echo
@ -1139,8 +1165,9 @@ elif [ "$1" = "-o" ]; then
value=`cat /home/pi/CubeSatSim/.mode`
echo "$value" > /dev/null
set -- $value
MODE=$1
if [ "$1" == "n" ]; then
if [ "$MODE" == "n" ]; then
transmit_command "o"
@ -1152,34 +1179,18 @@ elif [ "$1" = "-o" ]; then
FILE=/home/pi/CubeSatSim/beacon_off
if [ -f "$FILE" ]; then
echo "Transmit beacon telemetry is off"
# echo
# echo "Do you want to turn beacon telemetry ON (y/n) "
# read reset
reset="y"
echo
if [ "$reset" = "y" ] || [ "$reset" = "yes" ] ; then
echo "Turn beacon telemetry ON"
sudo rm /home/pi/CubeSatSim/beacon_off > /dev/null 2>&1
sudo systemctl restart transmit
# restart=1
fi
else
echo "Transmit beacon telemetry is on"
# echo
# echo "Do you want to turn beacon telemetry OFF (y/n) "
# read reset
reset="y"
echo
if [ "$reset" = "y" ] || [ "$reset" = "yes" ] ; then
echo "Turn beacon telemetry OFF"
touch /home/pi/CubeSatSim/beacon_off
sudo systemctl restart transmit
# restart=1
fi
fi
sleep 3
fi

20
direwolf/direwolf-pacsatsim-pwm-loopback.conf
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@ -0,0 +1,20 @@
ADEVICE shared_mic plughw:CARD=Loopback,DEV=0
PTT GPIOD gpiochip0 17
MYCALL AMSAT-12
CHANNEL 0
MODEM 1200
##FULLDUP ON
##TXDELAY 15
#FIX_BITS 1 AX25
#
DWAIT 0
SLOTTIME 10
PERSIST 63
TXDELAY 1000
#TXDELAY 100
TXTAIL 10
#TXTAIL 1
FULLDUP OFF
DIGIPEAT 0 0 ^WIDE[3-7]-[1-7]$|^TEST$ ^WIDE[12]-[12]$ TRACE

9
direwolf/direwolf-pacsatsim.conf
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@ -1,6 +1,9 @@
ADEVICE plughw:CARD=Device,DEV=0 plughw:CARD=Headphones,DEV=0
PTT GPIO 20
MYCALL AMSAT
CHANNEL 0
MODEM 1200
DWAIT 0
SLOTTIME 10
PERSIST 63
TXDELAY 1000
TXTAIL 10
FULLDUP OFF
DIGIPEAT 0 0 ^WIDE[3-7]-[1-7]$|^TEST$ ^WIDE[12]-[12]$ TRACE

10
groundstation/direwolf/direwolf-pacsat.conf
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@ -1,5 +1,9 @@
MYCALL AMSAT
ADEVICE plughw:CARD=Loopback,DEV=1 plughw:CARD=Headphones,DEV=0
PTT GPIO 20
CHANNEL 0
MODEM 1200
KISSPORT 8100
AGWPORT 8002
DWAIT 20
SLOTTIME 300
PERSIST 63
TXDELAY 1000
FULLDUP OFF

17
groundstation/pacsat-config.sh
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@ -113,9 +113,9 @@ sudo killall -9 direwolf &>/dev/null
echo
if [ "$ANS" = "1" ] ; then
oldcallsign=$(grep -oP '(?<=bbsCallsign=).*(?=-)' /home/pi/PacSatGround/spacecraft/PacSatSim.properties)
oldcallsign=$(grep -oP '(?<=bbsCallsign=).*(?=-)' /home/pi/Desktop/PacsatGround/spacecraft/PacSatSim.properties )
else
oldcallsign=$(grep -oP '(?<=bbsCallsign=).*(?=-)' /home/pi/PacSatGroundLoop/spacecraft/PacSatSim.properties)
oldcallsign=$(grep -oP '(?<=bbsCallsign=).*(?=-)' /home/pi/Desktop/PacsatGround/spacecraft/PacSatSim.properties )
fi
echo "Current value of remote PacSat callsign is"
echo $oldcallsign
@ -131,9 +131,9 @@ sudo killall -9 direwolf &>/dev/null
else
if [ "$ANS" = "1" ] ; then
sudo sed -i "s/$oldcallsign/$callsign/g" /home/pi/PacSatGround/spacecraft/PacSatSim.properties
sudo sed -i "s/$oldcallsign/$callsign/g" /home/pi/Desktop/PacsatGround/spacecraft/PacSatSim.properties
else
sudo sed -i "s/$oldcallsign/$callsign/g" /home/pi/PacSatGroundLoop/spacecraft/PacSatSim.properties
sudo sed -i "s/$oldcallsign/$callsign/g" /home/pi/Desktop/PacsatGround/spacecraft/PacSatSim.properties
fi
echo
echo "Changing callsign to "
@ -152,8 +152,17 @@ sudo killall -9 direwolf &>/dev/null
if [ "$ANS" = "1" ] ; then
sudo rm -r /home/pi/PacSatGround
cd
sudo rm PacSatGround.zip
wget https://github.com/alanbjohnston/CubeSatSim/raw/refs/heads/master-b-p-s/spacecraft/PacSatGround_0.46o/PacSatGround.zip
unzip PacSatGround.zip -d PacSatGround
sudo rm PacSatGround.zip
else
sudo rm -r /home/pi/PacSatGroundLoop
sudo rm PacSatGround.zip
wget https://github.com/alanbjohnston/CubeSatSim/raw/refs/heads/master-b-p-s/spacecraft/PacSatGround_0.46o/PacSatGround.zip
unzip PacSatGround.zip -d PacSatGroundLoop
sudo rm PacSatGround.zip
fi
else

173
groundstation/pacsat.sh
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@ -1,21 +1,79 @@
#!/bin/bash
# script to auto decode packet using rtl_fm and Direwolf and run Pacsat Ground Station
# script to auto decode packets using Direwolf and FM TXC and run Pacsat Ground Station
sudo pkill -f "/home/pi/CubeSatSim/groundstation/direwolf-pacsat-tmp.conf"
loopback=0
vox=0
safe=0
card=0
pwm=0
if [ "$1" = "l" ] ; then
loopback=1
echo "PacSat Ground Station with Loopback"
elif [ "$1" = "v" ] ; then
vox=1
echo "PacSat Ground Station with Soundcard (VOX)"
elif [ "$1" = "c" ] ; then
card=1
else
pwm=1
fi
if [[ $(arecord -l | grep "USB Audio Device") ]] ; then
echo "USB Sound Card detected"
soundcard=1
else
echo "No USB Sound Card detected"
soundcard=0
fi
gpio -g mode 7 up
if [[ $(gpio -g read 7 | grep 0) ]] ; then
echo "TXC is present"
txc=1
else
echo "TXC not present"
txc=0
fi
timeout 1 rtl_test &> out.txt
if [[ $(grep "No supported" out.txt) ]] ; then
echo "No RTL-SDR detected"
rtl=0
else
echo "RTL-SDR detected."
rtl=1
fi
FILE=/home/pi/CubeSatSim/battery_saver
if [ -f "$FILE" ]; then
safe=1
fi
value=`cat /home/pi/CubeSatSim/sim.cfg`
echo "$value" > /dev/null
set -- $value
callsign="$1"
frequency="$7e3"
echo -n "Callsign is "
echo $callsign
echo -n "Transmit Frequency is "
echo $frequency
echo
if [ ! -d "/home/pi/PacSatGround" ] ; then
mkdir /home/pi/PacSatGround
@ -77,69 +135,93 @@ sudo killall -9 CubicSDR &>/dev/null
sudo killall -9 zenity &>/dev/null
echo
#sudo systemctl restart pacsatsim
#sudo /etc/init.d/alsa-utils stop
#sudo /etc/init.d/alsa-utils start
sudo usermod -a -G gpio pi
#echo "Waiting 10 seconds for Pacsatsim to start"
#sleep 10
#value=`cat /home/pi/CubeSatSim/sim.cfg`
#echo "$value" > /dev/null
#set -- $value
#echo "Receive frequency is $8 MHz"
#echo "Transmit frequency is $7 MHz"
#echo
#echo "To change, quit and type CubeSatSim/config -F"
#echo
if [ "$loopback" = "1" ] ; then
#frequency="$8e6"
echo "Using Audio Loopback"
ADEVICE="ADEVICE plughw:CARD=Loopback,DEV=1"
PTT="PTT GPIOD gpiochip0 17"
#echo "Note that the 'Tuned to' frequency will be different from the chosen frequency due to the way SDRs work."
elif [ "$safe" = "1" ] ; then
#echo
ADEVICE="ADEVICE shared_mic plughw:CARD=Loopback,DEV=0"
PTT="PTT GPIOD gpiochip0 17"
echo
echo "The Pacsat Ground Station is running on this Pi using FM receiver or RTL-SDR"
echo
if [ ! "$txc" = "1" ] ; then
echo "Safe mode - battery saver won't work since no TXC present"
sleep 5
elif [ ! "$soundcard" = "1" ] ; then
echo "Safe mode - battery saver won't work since no sound card present"
sleep 5
else
echo "Safe mode - battery saver"
fi
#cd /home/pi/Desktop/PacSatGround_0.46m_linux/
elif [ "$vox" = "1" ] ; then
#setsid java -Xmx512M -jar PacSatGround.jar "/home/pi/PacSatGround" # removed &
ADEVICE="ADEVICE plughw:CARD=Device,DEV=0"
PTT="PTT GPIOD gpiochip0 17"
#direwolf -P+ -D1 -qd -dp -r 48000 -c /home/pi/CubeSatSim/groundstation/direwolf/direwolf-pacsat-loopback.conf -t 0 # &
#/usr/bin/x-terminal-emulator --geometry=120x40 -e "direwolf -P+ -D1 -qd -dp -r 48000 -c /home/pi/CubeSatSim/groundstation/direwolf/direwolf-pacsat-loopback.conf -t 0"
if [ "$soundcard" = "1" ] ; then
echo "Using Soundcard Audio TX and RX (VOX, no PTT)"
else
echo "Soundcard Audio TX and RX (VOX, no PTT) will not work since no sound card present"
sleep 5
fi
sudo usermod -a -G gpio pi
elif [ "$pwm" = "1" ] ; then
if [ "$loopback" = "1" ]; then
#/usr/bin/x-terminal-emulator --geometry=120x40 -e "/home/pi/CubeSatSim/groundstation/pacsat-df.sh"
ADEVICE="ADEVICE shared_mic plughw:CARD=Headphones,DEV=0"
PTT="PTT GPIOD gpiochip0 -20"
echo "Using Audio Loopback"
/home/pi/CubeSatSim/groundstation/pacsat-d.sh &
if [ ! "$txc" = "1" ] ; then
echo "FM TXC using Soundcard input (JP13), PWM output won't work since no TXC present"
sleep 5
elif [ ! "$soundcard" = "1" ] ; then
echo "FM TXC using Soundcard input (JP13), PWM output won't work since no sound card present"
sleep 5
else
echo "FM TXC using Soundcard input (JP13), PWM output"
fi
elif [ "$vox" = "1" ]; then
else
echo "Using Soundcard Audio TX RX (VOX)"
/home/pi/CubeSatSim/groundstation/pacsat-dj.sh &
echo "FM TXC using Soundcard input (JP13) and output (JP14)"
ADEVICE="ADEVICE shared_mic plughw:CARD=Device,DEV=0"
PTT="PTT GPIOD gpiochip0 -20"
if [ ! "$txc" = "1" ] ; then
echo "FM TXC using Soundcard input (JP13) and output (JP14) won't work since no TXC present"
sleep 5
elif [ ! "$soundcard" = "1" ] ; then
echo "FM TXC using Soundcard input (JP13), output (JP14) won't work since no sound card present"
sleep 5
else
echo "Using TXC FM Transceiver"
/home/pi/CubeSatSim/groundstation/pacsat-df.sh &
echo "FM TXC using Soundcard input (JP13), output JP14"
fi
fi
# arecord -D plughw:CARD=Loopback,DEV=1 -f S16_LE -r 48000 -c 1 | csdr convert_s16_f | csdr gain_ff 14000 | csdr convert_f_samplerf 20833 | sudo rpitx -i- -m RF -f 435045 &
##arecord -D plughw:CARD=Loopback,DEV=1 -f S16_LE -r 48000 -c 1 | csdr convert_s16_f | csdr gain_ff 4000 | csdr convert_f_samplerf 20833 | sudo rpitx -i- -m RF -f 435045 &
DIREWOLF_CONF="/home/pi/CubeSatSim/groundstation/direwolf-pacsat-tmp.conf"
echo "$ADEVICE" > $DIREWOLF_CONF
echo "MYCALL $callsign-1" >> $DIREWOLF_CONF
echo "$PTT" >> $DIREWOLF_CONF
cat /home/pi/CubeSatSim/groundstation/direwolf/direwolf-pacsat.conf >> $DIREWOLF_CONF
# echo "Don't close the direwolf window or the Pacsatsim will stop running."
echo
echo "$DIREWOLF_CONF"
echo
cat $DIREWOLF_CONF
echo
direwolf -r 48000 -c $DIREWOLF_CONF -t 0 &
cd /home/pi/Desktop/PacsatGround/
@ -152,13 +234,6 @@ else
setsid java -Xmx512M -jar PacSatGround.jar "/home/pi/PacSatGround" # removed &
fi
#cd /home/pi/Desktop/PacSatGround_0.46m_linux/
#sudo setsid java -Xmx512M -jar PacSatGround.jar "/home/pi/PacSatGround"
cd
#sudo systemctl stop pacsatsim
sleep 10

6
install
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@ -171,6 +171,8 @@ if [[ $(grep 'bookworm' /etc/os-release) ]]; then
sudo sed -i 's/#dtparam=i2c_arm=on/dtparam=i2c_arm=on/g' /boot/firmware/config.txt
sudo sed -i 's/#dtoverlay=vc4-fkms-v3d/dtoverlay=vc4-fkms-v3d/g' /boot/firmware/config.txt
if [[ $(grep 'dtoverlay=i2c-gpio,bus=3,i2c_gpio_delay_us=1,i2c_gpio_sda=23,i2c_gpio_scl=24' /boot/firmware/config.txt) ]]; then
echo "dtoverlay=i2c-gpio already in /boot/firmware/config.txt"
else
@ -813,6 +815,10 @@ cd
#fi
sed -i 's/quick_exec=0/quick_exec=1/' ~/.config/libfm/libfm.conf
sudo apt install -y raspberrypi-ui-mods
if [ "$noreboot" = "0" ] ; then
if [ $FLAG -eq 1 ]; then # Not sure if this is needed

4
main.c
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@ -273,7 +273,7 @@ int main(int argc, char * argv[]) {
}
}
}
/*
if ( mode == PACSAT) {
FILE * pacsat_file = popen("sudo systemctl restart pacsatsim", "r");
pclose(pacsat_file);
@ -282,7 +282,7 @@ int main(int argc, char * argv[]) {
FILE * pacsat_file = popen("sudo systemctl stop pacsatsim", "r");
pclose(pacsat_file);
}
*/
// Open telemetry file with STEM Payload Data
telem_file = fopen("/home/pi/CubeSatSim/telem.txt", "a");
if (telem_file == NULL)

106
pacsatsim.sh
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@ -4,6 +4,10 @@
loopback=0
vox=0
safe=0
card=0
pwm=0
if [ "$1" = "l" ] ; then
loopback=1
@ -12,6 +16,47 @@ elif [ "$1" = "v" ] ; then
vox=1
elif [ "$1" = "c" ] ; then
card=1
else
pwm=1
fi
FILE=/home/pi/CubeSatSim/battery_saver
if [ -f "$FILE" ]; then
safe=1
fi
if [[ $(arecord -l | grep "USB Audio Device") ]] ; then
echo "USB Sound Card detected"
soundcard=1
else
echo "No USB Sound Card detected"
soundcard=0
fi
gpio -g mode 7 up
if [[ $(gpio -g read 7 | grep 0) ]] ; then
echo "TXC is present"
txc=1
else
echo "TXC not present"
txc=0
fi
timeout 1 rtl_test &> out.txt
if [[ $(grep "No supported" out.txt) ]] ; then
echo "No RTL-SDR detected"
rtl=0
else
echo "RTL-SDR detected."
rtl=1
fi
if [ ! -d "/home/pi/PacSat" ]; then
@ -49,6 +94,7 @@ echo "$value" > /dev/null
set -- $value
callsign="$1"
frequency="$7e3"
echo "Configured callsign is "
echo $callsign
@ -71,8 +117,6 @@ if [ ! "$callsign" = "$oldcallsign" ] ; then
fi
sudo /etc/init.d/alsa-utils stop
sudo /etc/init.d/alsa-utils start
@ -144,20 +188,68 @@ sudo usermod -a -G gpio pi
if [ "$loopback" = "1" ] ; then
echo "Using audio loopback"
sudo /home/pi/CubeSatSim/pacsatsim-d.sh &
ADEVICE="ADEVICE plughw:CARD=Loopback,DEV=0"
PTT="PTT GPIOD gpiochip0 17"
# sudo /home/pi/CubeSatSim/pacsatsim-d.sh &
# direwolf -P+ -D1 -qd -dp -r 48000 -c /home/pi/CubeSatSim/direwolf/direwolf-pacsatsim-loopback.conf -t 0 &
elif [ "$safe" = "1" ] ; then
echo "Safe mode - battery saver"
# sudo /home/pi/CubeSatSim/pacsatsim-d.sh &
ADEVICE="ADEVICE shared_mic plughw:CARD=Loopback,DEV=0"
PTT="PTT GPIOD gpiochip0 17"
# direwolf -P+ -D1 -qd -dp -r 48000 -c /home/pi/CubeSatSim/direwolf/direwolf-pacsatsim-pwm-loopback.conf -t 0 &
# arecord -D plughw:CARD=Loopback,DEV=1 -f S16_LE -r 48000 -c 1 | csdr convert_s16_f | csdr gain_ff 4000 | csdr convert_f_samplerf 20833 | sudo rpitx -i- -m RF -f 434900 &
# arecord -D plughw:CARD=Loopback,DEV=1 -f S16_LE -r 48000 -c 1 | csdr convert_s16_f | csdr gain_ff 4000 | csdr convert_f_samplerf 20833 | sudo rpitx -i- -m RF -f $frequency &
elif [ "$vox" = "1" ]; then
echo "Using Soundcard Audio TX and RX (VOX)"
sudo /home/pi/CubeSatSim/pacsatsim-dj.sh &
echo "Using Soundcard Audio TX and RX (VOX, no PTT)"
ADEVICE="ADEVICE plughw:CARD=Device,DEV=0"
PTT="PTT GPIOD gpiochip0 17"
# sudo /home/pi/CubeSatSim/pacsatsim-dj.sh &
# direwolf -P+ -D1 -qd -dp -r 48000 -c /home/pi/CubeSatSim/direwolf/direwolf-pacsatsim-jp14-half.conf -t 0 &
elif [ "$pwm" = "1" ] ; then
echo "FM TXC using Soundcard input (JP13), PWM output"
ADEVICE="ADEVICE shared_mic plughw:CARD=Headphones,DEV=0"
PTT="PTT GPIOD gpiochip0 -20"
# direwolf -P+ -D1 -qd -dp -r 48000 -c /home/pi/CubeSatSim/direwolf/direwolf-pacsatsim-pwm.conf -t 0 &
else
echo "Using TXC FM transceiver"
sudo /home/pi/CubeSatSim/pacsatsim-df.sh &
echo "FM TXC using Soundcard input (JP13) and output (JP14)"
ADEVICE="ADEVICE shared_mic plughw:CARD=Device,DEV=0"
PTT="PTT GPIOD gpiochip0 -20"
# direwolf -P+ -D1 -qd -dp -r 48000 -c /home/pi/CubeSatSim/direwolf/direwolf-pacsatsim-jp14.conf -t 0 &
fi
DIREWOLF_CONF="/home/pi/CubeSatSim/direwolf-pacsatsim-tmp.conf"
echo "$ADEVICE" > $DIREWOLF_CONF
echo "MYCALL $callsign-1" >> $DIREWOLF_CONF
echo "$PTT" >> $DIREWOLF_CONF
cat /home/pi/CubeSatSim/direwolf/direwolf-pacsatsim.conf >> $DIREWOLF_CONF
echo
echo "$DIREWOLF_CONF"
echo
cat $DIREWOLF_CONF
echo
direwolf -P+ -D1 -qd -dp -r 48000 -c $DIREWOLF_CONF -t 0 &
# arecord -D plughw:CARD=Loopback,DEV=1 -f S16_LE -r 48000 -c 1 | csdr convert_s16_f | csdr gain_ff 14000 | csdr convert_f_samplerf 20833 | sudo rpitx -i- -m RF -f 434900 &
## arecord -D plughw:CARD=Loopback,DEV=1 -f S16_LE -r 48000 -c 1 | csdr convert_s16_f | csdr gain_ff 4000 | csdr convert_f_samplerf 20833 | sudo rpitx -i- -m RF -f 434900 &

BIN
spacecraft/PacSatGround_0.46o/PacSatGround.zip
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Binary file not shown.

37
transmit.py
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@ -26,7 +26,7 @@ def input(pin):
# print(f"Command run was: {query}")
# print("Sucess!")
# print(f"Output of the command (stdout): {result.stdout}")
print(f"{command}: {result.stdout}")
# print(f"{command}: {result.stdout}")
return int(result.stdout)
except subprocess.CalledProcessError as e:
# print(f"Command failed with return code: {e.returncode}")
@ -324,7 +324,6 @@ if __name__ == "__main__":
print("Can't open .mode file, defaulting to FSK")
print("Mode is: ")
print(mode)
# system("sudo systemctl stop pacsatsim")
try:
file = open("/home/pi/CubeSatSim/beacon_off")
@ -337,6 +336,9 @@ if __name__ == "__main__":
print("Command_tx: ")
print(command_tx)
if (mode != "p") or (command_tx == False):
system("sudo systemctl stop pacsatsim")
try:
file = open("/home/pi/CubeSatSim/command_count.txt", "r")
string = file.read()
@ -551,20 +553,43 @@ if __name__ == "__main__":
print("Pacsat Ground Station")
else:
print("Pacsat")
# system("sudo systemctl restart pacsatsim")
if (command_tx == True):
system("sudo systemctl restart pacsatsim")
print("Starting PacSatSim")
output(txLed, 0)
print("0")
rpitx = "arecord -D plughw:CARD=Loopback,DEV=1 -f S16_LE -r 48000 -c 1 | csdr convert_s16_f | csdr gain_ff 4000 | csdr convert_f_samplerf 20833 | sudo rpitx -i- -m RF -f " + tx + "e3 > /dev/null 2>&1 &"
stop_rpitx = "sudo killall -9 rpitx && sudo killall -9 arecord && sudo rpitx -m RF -f 434.9e3 > /dev/null 2>&1"
if not txc:
system(stop_rpitx)
system(rpitx)
print("Safe Mode!")
while (True):
if (txc):
sleep(0.1)
while (input(ptt) != 0):
sleep(0.2)
output(txLed, 1)
print("1")
# print("1")
while (input(ptt) != 1):
sleep(0.2)
output(txLed, 0)
print("0")
# print("0")
else:
# sleep(0.1)
while (input(17) == 0):
sleep(0.05)
## system(rpitx)
output(txLed, 1)
# print("1")
while (input(17) == 1):
sleep(0.05)
## system(stop_rpitx)
output(txLed, 0)
# print("0")
# sleep(10)
else:
print("Transmit APRS Commands")
system("sudo systemctl stop command")

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