Quantity   Component name
1 × OLED (SSD1306), 1.3'' or 2.42'' size
1 × STM32F103C8T6 Microprocessors, Microcontrollers, DSPs / ARM, RISC-Based Microcontrollers
1 × HT7533 For LiPo to VCC regulation
4 × Push-buttons
1 × Single cell LiPo battery capacity to be decided
1 × Temperature sensor possibly DS18B20, gives good precision over reasonable range
2 × Neodymium magnets
1 × I2C EEPROM For permanent storage of configuration and some statistics