Health, sport and environment in Arduino projects

New projects on Arduino and ESP32/8266 platforms are described and fascinating experiments on the study of the human body and the environment using the most modern and affordable sensors and a professional level modules. Each project begins with the description of the basics of the phenomenon under study and ends with experiments and tasks for independent work. It is told how to choose an Arduino fee, create a home laboratory, measure the pulse frequency and oxygen content in the blood, check the galvanic reaction of the skin, remove the electrocardiogram and register muscle currents, control the purity of the air and measure the intensity of ultraviolet radiation in different ranges, process data and work with online ADAFRUT IO visualization service. The publisher’s website is placed an archive of files with the source codes of programs and color illustrations