I need to control liquids flows in the context of my work experience.
I have a Arduino Mega 2560, 3 Ardumoto shields and 5 peristaltic pumps (80rpm) : http://www.thermoscientific.com/ecomm/servlet/productsdetail_11152_L10393_81880_13106372_-1
I'm using the PWM pin's in order to control the flowrate, and i wasn't able to find out on the internet whether the relation between PWM and flowrate is linear or not.
For now, i'm assuming this : flowrate range is 0.100 to 11mL/min, so :
analogWrite(PUMP_1, 255); //leads to a maximum flow rate
analogWrite(PUMP_1, 0); // leads to the minimum flowrate which is 0.1 ml/min
analogWrite(PUMP_1, 128); // leads to half of the maximum flowrate
Am i right or not?
If not, is there a graphic i can find to do a correct conversion of what i want?
Thanks for reading