  Industrial applications of plasma have significantly increased beyond
semiconductor manufacturing in recent years. This necessitates training a
skilled workforce in plasma science and technology. However, an essential
challenge to this end stems from the high cost of plasma devices and
diagnostics. The limited access to plasma devices has hindered plasma
education, particularly in the least developed countries. To this end, this
paper demonstrates how low-cost sensors and circuits can be developed to enable
inexpensive plasma experiments in laboratory environments. In particular, we
show how to measure high voltage, current, and power from a cold-atmospheric
plasma discharge. Additionally, we develop a low-cost illuminance sensor and
demonstrate how it can be used to estimate the corresponding plasma power. The
low-cost sensors and electronics presented in this paper can aid educators in
characterizing plasma power versus plasma illuminance.
