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Hi Luc,Thanks for posting this guide! I'm having trouble with the code. Could you help me? I'm having many issues, but I'm currently troubleshooting. When I try to run chklevel.php directly I get the following messagepi@raspberrypi /var/www/sumppump $ sudo php chklevel.phpsh: 1: /var/www/sumppump/sensor.py: Permission deniedPHP Notice: Undefined offset: 0 in /var/www/sumppump/chklevel.php on line 13Mesure final -11cm Mesure final -4.3pouce 00 have been send sh: 1: /usr/sbin/sendmail: not foundMessage cannot be send