The Zumo Robot Shield can be fitted with a Reflectance Sensor Array that allows it to solve different line/maze style problems. The Zumo Shield libraries provide methods to help read values from the sensor array. Packages and installation instructions can be downloaded from GitHub and once installed the sensor library can be included from Sketch > Include Library. The sensor array uses the QTR sensors and therefore their library must also be included (installed as standard).
MySql – Feedback
Getting helpful feedback from MySQL when it errors is possible if you use the following:
mysql_query($sql) or die('Some useful message:' . mysql_error() );
MySql – Relationships
Dealing with relationships in MySql is not as straightforward as either MS Access or as you would have hoped for. Creating simple primary keys isn’t too difficult
TKinter is the easiest way to get drawing in Python.