Ehican, IlyasSarioglu, Baykal2024-07-182024-07-182019https://doi.org/10.23919/eleco47770.2019.8990449https://hdl.handle.net/11411/812911th International Conference on Electrical and Electronics Engineering (ELECO) -- NOV 28-30, 2019 -- Bursa, TURKEYThis paper presents an ultra low power all-optical portable battery-free embedded microsystem that can be powered and controlled by a smart mobile phone. The microsystem contains an ultra-low voltage microcontroller as the processing unit; and, it receives power via a mini-solar cell. The optically powered microcontroller reads the local sensor data and transmits it to the mobile phone via modulating the light of an LED. A custom optical communication protocol that is based on Pulse Period Modulation is designed for the system. An image processing based mobile application utilizing the built-in flash of the phone is also programmed for controlling the microsystem. The mobile phone application using the built-in rear-facing camera analyzes the modulated optical signal from the LED on the microsystem and extracts the transmitted data. Experimental results of various local temperature measurements are also given.eninfo:eu-repo/semantics/closedAccessInternetSystemThingsConference Object2-s2.0-8508095764310.23919/eleco47770.2019.8990449401N/A397N/AWOS:000552654100075