Created Wednesday 11 January 2017
Interacting with GPIOs from a shell script example: (enter the following into a file, test1.sh, using your favorite editor)
#!/bin/bash
#File: test1.sh
#Shell script to blink LED connected to GPIO4
export GREENLED=4
echo "Blink LED connected to GPIO$GREENLED"
echo "$GREENLED" > /sys/class/gpio/export
echo out > /sys/class/gpio/gpio"$GREENLED"/direction
for i in {1..10}
do
echo 1 > /sys/class/gpio/gpio"$GREENLED"/value
sleep 1
echo 0 > /sys/class/gpio/gpio"$GREENLED"/value
sleep 1
done
echo "$GREENLED" > /sys/class/gpio/unexport
After creating the shell script, change the file's mode such that it's executable
- Choose one - Each of these commands will set the user permission for execute:
chmod u=rwx test1.sh
chmod u+x test1.sh
chmod 755 test1.sh
u is for user,
g is for group,
o is for others.
r is for read permission,
w is for write permission,
x is for execute permission.
Now, run your shell script
$ ./test1.sh