Atmel AVR microcontroller C (Computer program language) 14 Embedded computer systems 12 Programmable controllers 12 Design and construction 10 Assembler language (Computer program language) 9 Programming 5 Computers 4 Microprocessors 4 Electronic apparatus and appliances 3 Arduino (Programmable controller) 2 Microcontrollers 2 PID controllers 2 Amateurs' manuals 1 Assembly languages (Electronic computers) 1 Electronic 1