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A new scheme on test and control system for chlorophyll fluorescence is presented in this work, which uses light-emitting diode (LED) excitation by means of measuring the fluorescence parameter fpsII. The system takes programmable power supply as LEDs illumination drive power with high sensitivity and signal-to-noise ratio. MINIPAM is used to measure fluorescence parameter fpsII and keeps communication with upper PC by serial port. The upper PC can control the power supply and process the datadoaj:633a76f62c5f4310bd0dff3088f6a8f0 fatcat:qmhjij2y6zhi5pzd74fmi44mhe