Digital peristalic pumps
Jukka.Luukkonen 2023-04-05 23:24:57 371 Views7 Replies Hello!
I have hydroponics nutrient doser project with Arduino. Im trying to control 2 peristaltic pumps. https://wiki.dfrobot.com/Gravity__Digital_Peristaltic_Pump_SKU__DFR0523 Pumps should pump same amount of nutrient solution, components A&B. Now I have tested those pumps and results were that another pump pumps more than another. In my sketch myservo3 pumps always more than myservo2. myservo2 pumps 0,85 times liquid than myservo3. Any ideas what could cause this?
Im using external 5V power to power up pumps (switching power supply 230v/3/4,5/5/6/7,5/9/12V 27W 2250mA)
Is the gnd of the external power supply connected to the gnd of the arduino? Is the gnd of the external power supply connected to the gnd of the arduino? Will the pumps resume working when the program soft reset?
jenna Then another question related these pumps. When running program, pumps work normally, but if pumps not been used for a while, lets say 1-2 days they dont start, until disconnect connector (is it called JST-connector?) and place it back again. After that pumps start working normally again. What could cause this? I'm powering pumps from external 5V power, control signal comes from Arduino
Jukka.Luukkonen Great! Thank you for your response. But… I'm doing this project with Arduino MKR-board and cant use that sketch, because missing EEPROM. Do you have any advices how can I do calibration with MKR-board? For example if I have 2 pumps and when writing myservo2.write(0) myservo3.write(0) and another pump gives 0,85 times amount of liquid than another pump. Any advices how I can solve this? Any parameters?
Choosing MKR-board for my hydroponics project was a not so great choice. I have had this same missing EEPROM problem now with EC-sensor, pH-sensor(using old code for pH-sensor, new doesnt work) and now with these pumps. Could you make libraries, that work with these boards also?
Jukka.Luukkonen 
