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Dosing pump/ph probe problem


Post Number:#1 Post Sat Mar 03, 2018 6:33 am
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Hi Fernando,
the project for my aquarium continues.
now I'm working on the dosing pumps.
I have a problem with the ph probe.
when I connect the gnd of the power of the dosometric pumps in common with the gnd of the ferduino the ph probe reads 14.
I read about the iso board but I do not think it's possible to buy it anymore
thank you

Post Number:#2 Post Sat Mar 03, 2018 9:56 am
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Hi!

Are you using LC filter for this power supply too?

Are you using diodes as explained on topic about Ferduino M.?

Best regards.
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Post Number:#3 Post Sat Mar 03, 2018 11:08 am
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yes, I use the filter.
but I have the problem when I power the board with the external power supply. when I use the usb the ph probe detects correct values.
if I change the power to 7v the ph goes 14.
now I was trying the dosage pumps by feeding the board with the usb and the 12v pumps

Post Number:#4 Post Sat Mar 03, 2018 11:23 am
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Christopher haven't more ISO boards to sell?
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Post Number:#5 Post Sat Mar 03, 2018 11:51 am
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Post Number:#6 Post Sat Mar 03, 2018 12:06 pm
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Can you find someone able to assembly the board with SMD parts for you? I can sell only the PCB for you.
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Post Number:#7 Post Sat Mar 03, 2018 1:39 pm
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I work with many electricians. I can try to ask them. can you tell me the parts that I have to buy besides the pcb?

I have 3v dosing pumps. can I use them by feeding them with the 5v socket?
I believe that the vin by feeding the board with the USB does not go

Post Number:#8 Post Sat Mar 03, 2018 3:52 pm
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can you tell me the parts that I have to buy besides the pcb?


I'll send it for you after buy the board. It's a small amount of parts.

I have 3v dosing pumps. can I use them by feeding them with the 5v socket?


Obviously not!
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Post Number:#9 Post Sat Mar 03, 2018 4:11 pm
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Post Number:#10 Post Sat Mar 03, 2018 4:43 pm
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say no because the voltage is different (I would lower the voltage with diode)


Don't try make what you don't understand otherwise you will damage your board.
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Post Number:#11 Post Sat Mar 03, 2018 4:46 pm
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