P639: Construction of a photometer as an instructional tool for electronics and instrumentation
In this poster I will describe an introductory electronics laboratory unit for the undergraduate chemical instrumentation course. In this unit, students use basic electronic components to build a functioning photometer. Students interface the photometer to a microcontroller and write an Arduino program to collect the signal, calculate the absorbance and display the result on a liquid crystal display (LCD). Students use their home-built instruments to measure the concentration of hexavalent chromium in a water sample, and determine the figures of merit: sensitivity, detection limit, and dynamic range of the instrument.