Search the Community
Showing results for tags 'gpio'.
Found 1 result
-
Hi all, Sorry if this isnt the right place to ask this. I have tried many other forums and have had no luck. I am learning programming for Raspberry Pi. Currently, I can read the output of a pin (GPIO) on the circuit board as such: <?php exec ( "gpio read 7", $status ); print_r ( $status ); ?> That works fine - it prints the status to the screen. However, if I put this in an 'if' statement, eg: <?php if (isset($_GET['trigger']) && $_GET['trigger'] == 1) { exec ( "gpio read 7", $status ); print_r ( $status ); exec ( "gpio write 7 1" ); } ?> It no longer works. I know the if statement is correct as exec ( "gpio write 7 1" ); produces results. Would anyone know what I have done wrong here or why I would not be able to read the status? Many thanks in advance