redefine $IR through script

take_pic.sh

@@ -0,0 +1,28 @@
+
+# take a picture.
+# First turn on IR LEDS
+# GPIO27 is tyhe ground side of the IR leds, so setting it to 0 turns them on
+
+#BASH equiv to #define !
+IR=27
+
+if [ -d /sys/class/gpio/gpio27  ]; then
+echo " gpio$IR already exists "
+else
+echo $IR > /sys/class/gpio/export 
+fi
+
+sleep 0.1
+# turn on the IR leds
+echo out > /sys/class/gpio/gpio$IR/direction
+echo 0 > /sys/class/gpio/gpio$IR/value
+
+
+export d=`date`
+export picname=`echo $d | sed 's/ /_/g' | sed 's/:/_/g' `
+#echo $picname 
+
+libcamera-jpeg   -o /home/robin/Pictures/$picname.jpg -t 2000 --width 1200 --height 1000
+
+# turn off IR LEDS
+echo 1 > /sys/class/gpio/gpio$IR/value