reefgeezer
Active member
Can a 6VDC dosing pump be driven directly by a PWM signal?
Dosing Pump Control
- Thread starter reefgeezer
- Start date
Gorgok
New member
It would depend on what sort of current the signal can produce. I think an Arduino can handle 40mA max on its pins and other things less than that. My 6V pumps need around 1A to start and 300-500mA while running from testing. Running these directly would not work.
I decided to run my pumps off a L293B chip, using digital pins only and 5V source (its the same as the beaglebone board im running it on). You just have to remember to add the diode to the motors for protection. There was a chip version of the one i chose with inbuilt diodes, but it could handle only 60% of the current.
I decided to run my pumps off a L293B chip, using digital pins only and 5V source (its the same as the beaglebone board im running it on). You just have to remember to add the diode to the motors for protection. There was a chip version of the one i chose with inbuilt diodes, but it could handle only 60% of the current.
reefgeezer
Active member
Thanks for the reply. I'd hate to fry a controller. I saw a dosing pump that claimed to draw only 30ma but it's Chinese so I really don't trust the rating. Even if it did pull only 30ma, it suppose might surge too much @ start up.
reefgeezer
Active member
Thanks David, I have seen several diagrams like that. I had to ask the stupid question though. I'm trying to gather enough info to make a good make/buy decision about controllers.
disc1
-RT * ln(k)
I've driven 12V pumps at as low as 50% PWM through an N channel MOSFET. Below that speed that pretty much just stopped.
http://www.reefcentral.com/forums/showthread.php?t=2015868
Definitely read to the end because a LOT of things got fixed along the way.
http://www.reefcentral.com/forums/showthread.php?t=2015868
Definitely read to the end because a LOT of things got fixed along the way.
reefgeezer
Active member
I scanned that thread last week. I guess I should have actually read it. Since you mentioned, I did study up a little on MOSFETs - Thanks.
fefegarcia1
Member
Hi!
You can use this circuit:
Best regards
Fernando Garcia
You can use this circuit:
Best regards
Fernando Garcia
reefgeezer
Active member
Hi!
You can use this circuit:
Best regards
Fernando Garcia
Obrigado Fernando. Registei-me no seu site e estou aguardando um controlador construÃdo e codificado pronto. Eu estou tentando usar um controlador de tempestade para executar o meu LED e bombas dosadoras até que você solte o seu. Thanks Google Translate!
reefgeezer
Active member
Fernando, will this circuit run the pump at low PMW levels? Thanks again for the help.
fefegarcia1
Member
This circuit can supply of 0 up to 6 V.
The running will depend of the minimum voltage that the pump need to work.
The running will depend of the minimum voltage that the pump need to work.
