STM8S103F3P6 microcontroller unit has 640 Bit ROM, 10-Bit 5-Channels ADC, 1kB RAM, and a program memory size of 8kB. Other than these features, it provides I2C, SPI, and UART communication support with 7 timers.
It features 1 Kbyte of RAM with 8 Kbyte of Flash memories. 2.95V to 5.5V operating voltage makes it a suitable choice for 3.3V as well as 5.0V logic level operations on both operating voltages.
More details:https://www.utmel.com/componen....ts/stm8s103f3p6-micr

The RS232 connector is a port that allows data to be exchanged between devices. It was created to transfer data between DTE (Data Terminal Equipment) or a computer and DCE (Data Communication Equipment) or a modem. Parallel data exchange posed constraints, which necessitated the use of RS232. RS232 is a serial communication standard that allows data to be sent bit by bit. Although speedier USB (Universal Serial Bus) eventually superseded RS232, it remains popular in some areas. More specs:https://www.utmel.com/componen....ts/rs232-connector-p

The CD4071 is a four-OR gate CMOS device. There are four OR gates built on the device, each with two inputs. It's also known as a Quad 2-Input OR Gate. An OR gate is a logic gate that outputs HIGH if any of the inputs is HIGH. Otherwise, the output is otherwise LOW.
More specs:https://www.utmel.com/componen....ts/cd4071-dual-input