1. ABB PLC homepage: http://www.abb.com/PLC . Accessed 03 April 2016
2. Aldec homepage: http://www.aldec.com . Accessed 03 April 2016
3. Altera homepage: http://www.altera.com . Accessed 03 April 2016
4. Arduino homepage: http://www.arduino.cc . Accessed 03 April 2016
5. Atmel AVR homepage: www.atmel.com/AVR . Accessed 03 April 2016