Otter pyCCDgui This software is based on the work of Esben Rossel. Please check this link. I added zum features to make working with the instrument easier.Simple calibration to [nm]-scale by using cheap laserpointerSimple make and store of calibration curves and measurements of concentrationsSimple system for recording the kinetics of reactions. For more Information JfsCounter A pulse counter based on a ESP32 with a OLED display. It counts the nummer of pulses during a fixed time frame.The idea was to build a small and cheap counter as an interface between a device witch genenerates 5V TTL an a GUI that runs on a PC. for more information