Phototrap with Rapsberry and Minimodem

#!/bin/bash
#Install WiringPi: sudo apt-get install wiringpi
#PIR on pin 23
gpio mode 23 in
b=$(gpio read 23)
while true; do
if [ b != "0" ]; then
streamer -s 1280x720 -f jpeg -o /tmp/tmpfoto.jpeg
cat /tmp/tmpfoto.jpeg | minimodem -t 100
fi
sleep 1
done

#This is the receiver:
#!/bin/bash
result="/home/luca"
minsize="+10000c" #10KB
nohup minimodem -r 100 1> /tmp/tmpfoto.jpg 2>/tmp/tmpcode.txt
while true; do
b=$(tail -n 1 /tmp/tmpcode.txt)
if [[ $b== *"NOCARRIER"* ]];  then
if [[ $(find /tmp/tmpfoto.jpg -type f -size $minsize 2>/dev/null) ]]; then
mv /tmp/tmpfoto.jpg $result/$(date +%Y-%m-%d-%H-%M-%S).jpg
fi
fi
sleep 1
done