I am doing a special auto carbon dioxide generator. I will have calcium carbonate inside a cylindrical container and a acidic solution in an external bag. The idea is to pump the acidic solution onto the calcium carbonate via a miniature pump and on reacting, carbon dioxide will form. This carbon dioxide will cause a pressure build up inside the container and if the pressure say is more than 3 bars, I will require the pump to slow down its flow rate. And if the pressure is too low such that not enough carbon dioxide is produced, I would need the pump to pump in more acidic solution. Thus I would be using a pressure transducer and a arduino controller. May I know what are components would I need ? Thank you.