Most of the technologies that are covered under Industry 4.0 involves the use of microcontrollers and in particular IoT and Autonomous robotic application rely heavily on the capabilities of 8-bit microcontrollers. This books is designed for beginners as well as experts who want to design embedded systems using the power of 8-bit Microcontrollers. The book provides readers with an in depth understanding of the architecture of ATMEGA168PB microcontroller. Different On-chip modules of the microcontroller like Timers, Interrupts, A to D converter, I2C ,SPI, USART, Analog Comparator etc are explained with the help of simple C programs to so that readers can use them in designing embedded system applications. Special emphasis has been given on integrating ATMEGA168PB microcontroller with different peripherals like LCD, relay, motors, 7 segment display, sensors, bluetooth, wifi etc so, that users can use this 8-bit microcontroller for designing innovative solution.