But when I tested the pump, it did baheved strange. I supposed it will run continuosly while the power is connected to ist terminals. However instead, the rotation was periodicaly interrupted after about one half of the revoulution.
I have bought 4 of these pumps, and all behave the same way.
Does anybode have some experience with these pumps? I was powering the pump with 12V DC supply (two different, one rated 500mA, and one 2A with same result.) I have no specs for the pumps, so I don't know how much current the draw, so may be those power supplies are to weak.
Maybe this motor?
If it is then depending on the model you have the data says 3-9V or 12-25V so you could possibly be over volts (though this does not sound like the problem your having). Also the current rating under load will be getting close to your 2A PSU limit for the 3-9V.
How is the pump connected so the Arduino can control it? Is it a relay, a mosfet/transistor or some other means?
I saw the specs for the motor itself, and I was not sure, if it is mine, as the eBay spec are rating it for 3-12V. There is also some threads in this forum stating, this pump draws more then 6A, so I am now confused.
I am plannig to connect the pumps (2) to arduino via opto-isolated relay board. But the problems I am having now are independent from arduino, as they occur by just directly connecting the pump to power source, without any electronics between.
VanJ:
I saw the specs for the motor itself, and I was not sure, if it is mine, as the eBay spec are rating it for 3-12V. There is also some threads in this forum stating, this pump draws more then 6A, so I am now confused.
It could quite possibly draw 6A under heavy load. The data sheet says max efficiency 1.76A and stall 8.6A. But max efficiency is probably a light load (not a water pump).
VanJ:
I am plannig to connect the pumps (2) to arduino via opto-isolated relay board. But the problems I am having now are independent from arduino, as they occur by just directly connecting the pump to power source, without any electronics between.
Relay board should be fine, just wanted to be sure you was not grounding the pump through the Arduino ground pins.
Try a better power supply that can handle (both pumps) running at same time?
Riva:
Try a better power supply that can handle (both pumps) running at same time?
I will try to test them with my VOLTCRAFT jump starter device (rated for 700A (peak 1400A) 8) ). I hope this will be sufficient for test, and if it will work, I will find some better PSU.
The pumps don't necessary need to run at the same time, I can run them sequentialy. Timing for plants watering is not critical
(BTW: I have tested the pumps dry, without water. For les then 5s)
UPDATE:
I have tested it now using brute force (12.7V, 700A (1400A peak)) ;D And it works..
Then I have measured the current drain and it was about 1.72A at free run, but it was over 3A at start. May be a larger capacitor could help, but I will try to find a more powerfull psu.
I had similar problems, even with 4A Power supply my Arduino got crashed when the motor starts.
Tried really big capacity to buffer but with no working results.
How did you resolve this? I don't want to use a different power source.
