AquaticTechTank.net

Here's the pump hooked up to an arduino. The ardunio is sending PWM 0-255, waits 500ms, then 255-0.
You can see and here the change in (variable) speed.

The noise is reduced pumping water and is on some padding. I'm sure the vibration wouldn't bee too bad if it was screwed down.




Here it is running at a constant speed at 100 pwm.

Interesting - PWM drive does seem to make it much quieter - thanks for posting. Based in this I'm reconsidering, since i think i'd be able to get more precise flow rates with a peristaltic versus a diaphram pump like the Aqualifter. Any opinions on how long the motor is likely to last if it is driven at a very slow rate continuously? Does it have brushes or is it brushless? My nitrate filter probably needs about 0.5L/hr and it will work better with a fairly constant slow flow than with a faster flow that is cycled on and off.

thanks

are you powering the motor off of the Arduino? Wouldnt it be to much draw for the board and only be supplying the 5V from usb power?

Any chance you can post your sketch?

I finally got mine all setup aswell

Nice! I attempted to use the same pump to handle the flow into my Nitrate reactor, but didn't have much luck. I don't think these pumps are suitable for extended use. For my application, I needed a fairly steady flow rather than sporadic pumping of a very small volume, so the pump needs to be on somewhere around 40% of the time.

Pump #1 - the rotor started slipping on the shaft, then the motor burnt out. I think I got maybe 200 hours out of it. Adafruit promptly sent me a new pump (#2). Pump #2 worked fine for about a month (perhaps 300 hours) but I came downstairs last Saturday morning to find that the silicone tube inside the rotor housing had cracked and I had flooded our hardwood floors (luckily, only with about a quart of water). So I've given up on these and have gone back to a drip irrigation 1/2GPH flow restrictor and a solenoid valve, which works fine in my case because the flow into the Nitrate filter is under pressure from my canister filter. If I can get the silicone tubing replaced I may try to use the pump to feed nutrient into the filter, which would only require it to be on for a few minutes a day...

Don