Today, we worked on making the arduino's photoresistor work and we also tried to correct the errors in our script. During the period, we were not able to make much progress, but with Dr Kloth and Mr. Ryan's help, we were able to achieve both of our goals. Such progress was only possible through work after school. I also managed to save some time to improve our shopping cart by fitting an ajusted tracker and by polishing it with construction paper. In the next period, we have decided to further develop our scripting code, while other members of our teamates build the structure supporting the webcam.