It is made of a board known as a blue pill, with a 32-bit microcontroller STM32F103C8T6 (manufactured by STMicroelectronics) with a processor core, ARM Cortex-M3. This board can be bought at eBay, AliExpress and other stores.
Scheme compounds temperature sensor DS18B20 to STM32 board.
Supports up to 28 sensors that need to be connected in parallel.
Screenshot program.
In microcontroller chip there is a temperature sensor and this temperature is displayed in the top of table.
The source code for PC and STM32. http://pure-basic.narod.ru/forum_files/ ... ter_eng.7z