Hi there,
I'm a mechatronics engineer with over 7 years of experiences as maintenance, controls and electrical design engineer in the automotive industry, mainly at General Motors (8 speed rear wheel drive plant in Mexico) where I was the main responsible of machines updates, troubleshooting, new equipment installation and training of maintenance and controls engineers.
I can help you solving your problem and deliver to you the arduino program (fully commented) and the electrical diagram including all the safety devices required, circuit breakers, contactors, wire selection, and all the necessary information to make your system works.
Please contact me to discuss the job and start working.
Pedro Reynoso