Programmable logic devices Programmable controllers 44 Design and construction 33 Digital electronics 22 Logic design 22 VHDL (Computer hardware description language) 22 Logic circuits 18 Design 14 Digital integrated circuits 12 Mobile robots 11 Field programmable gate arrays 10 Programmable array logic 10 Computer programs 9 Microcontrollers 9 Automatic control 7 Control systems 7 Gate array circuits 6 Interactive multimedia 6 Laboratory manuals 6 Machine design 6 Solar energy 6 Digital circuits 5 CAD/CAM systems 4 Computer graphics 4 Computer integrated manufacturing systems 4 Flexible manufacturing systems 4 Integrated circuits 4 Photovoltaic power generation 4 Raspberry Pi (Computer) 4 Solar cells 4