This weekly report summarizes the progress of an engineering student group working on a food spoilage detection product. The group changed the sensor from a pH sensor to a CO2 sensor because the pH sensor required complex calibration. The circuit will control the opening and closing of a valve. The CO2 sensor will detect changes over 15 minutes and output millivolt signals that will be processed through expansion, comparison, and logic circuits to display the food status. The strong point of the design is its easy circuit. The weak point is that the CO2 sensor has high resolution but low changing CO2 levels, so detection may only work for very spoiled food. Next week, the student will measure food CO2 levels in a lab and gather data