Moodle for mobile
QR codes linking to Moodle site resource
Moodle 2.5.3? Try this one = content of the 1.9 QR code block, placed in a 2.5.3 block-set.
Checked and working with program Scan 126.96.36.199 on my Samsung III mini phone
(works without a settings.php, but maybe can someone else convert the settings from the included config.old)