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Trying to conect pcf8575 to control pumps, tpa, auto refil, skimmer pump, sump pump etc
I wire like this....
viewtopic.php?f=24&t=259#
after that i conect the out pin in the relay board
but the pumps stay on.. all the time
Forum ‹ Members section ‹ DIY Ferduino controller ‹ Pcf8575 control pumps
Pcf8575 control pumps
10 posts
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Post Number:#1
Mon Apr 10, 2017 4:54 pm
Mon Apr 10, 2017 4:54 pm
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Post Number:#2
Mon Apr 10, 2017 5:10 pm
Mon Apr 10, 2017 5:10 pm
Posts: 1699
Topics: 38 Images: 301 Solve rating: 233 Joined: Mon Mar 03, 2014 5:59 pm Topics: 38
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Hi!
Have you noticed that ULN2803 is mirrored in this image?
See where's GND:
Best regards.
Have you noticed that ULN2803 is mirrored in this image?
See where's GND:
Best regards.
Post your doubts on forum because it can help another user too. Just PM me for support if it's absolutely necessary.
Post Number:#3
Mon Apr 10, 2017 6:19 pm
Mon Apr 10, 2017 6:19 pm
Posts: 31
Topics: 9 Solve rating: 0 Joined: Tue Jan 10, 2017 2:19 pm Topics: 9
Age: 41 Gender: National Flag:
oooo i haven´t notice that!
butt
now... all pins off uln are off
butt
now... all pins off uln are off
Post Number:#4
Mon Apr 10, 2017 7:22 pm
Mon Apr 10, 2017 7:22 pm
Posts: 1699
Topics: 38 Images: 301 Solve rating: 233 Joined: Mon Mar 03, 2014 5:59 pm Topics: 38
Age: 39 Location: São Paulo Gender: National Flag:
And what it should be?
What's wrong?
What's wrong?
Post your doubts on forum because it can help another user too. Just PM me for support if it's absolutely necessary.
Post Number:#5
Mon Apr 10, 2017 10:49 pm
Mon Apr 10, 2017 10:49 pm
Posts: 31
Topics: 9 Solve rating: 0 Joined: Tue Jan 10, 2017 2:19 pm Topics: 9
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All connections are ok, das in pin d20, scl in pin d21
the display show -- reposição on
but in uln pin 11 to 18 still off
the display show -- reposição on
but in uln pin 11 to 18 still off
Post Number:#6
Tue Apr 11, 2017 9:49 am
Tue Apr 11, 2017 9:49 am
Posts: 1699
Topics: 38 Images: 301 Solve rating: 233 Joined: Mon Mar 03, 2014 5:59 pm Topics: 38
Age: 39 Location: São Paulo Gender: National Flag:
Hi!
Are you trying measure the voltage in this pins?
Remember the voltage in this pins is low (or ground). Try connect a LED 5mm for 5V and ULN pin to test.
Best regards.
Are you trying measure the voltage in this pins?
Remember the voltage in this pins is low (or ground). Try connect a LED 5mm for 5V and ULN pin to test.
Best regards.
Post your doubts on forum because it can help another user too. Just PM me for support if it's absolutely necessary.
Post Number:#7
Tue Apr 11, 2017 1:18 pm
Tue Apr 11, 2017 1:18 pm
Posts: 31
Topics: 9 Solve rating: 0 Joined: Tue Jan 10, 2017 2:19 pm Topics: 9
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Post Number:#8
Tue Apr 11, 2017 3:00 pm
Tue Apr 11, 2017 3:00 pm
Posts: 1699
Topics: 38 Images: 301 Solve rating: 233 Joined: Mon Mar 03, 2014 5:59 pm Topics: 38
Age: 39 Location: São Paulo Gender: National Flag:
This pics don't say anything to me.
Post your doubts on forum because it can help another user too. Just PM me for support if it's absolutely necessary.
Post Number:#9
Tue Apr 11, 2017 3:11 pm
Tue Apr 11, 2017 3:11 pm
Posts: 31
Topics: 9 Solve rating: 0 Joined: Tue Jan 10, 2017 2:19 pm Topics: 9
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i mesure the voltage as you told me
uln pins are all 0v
uln pins are all 0v
Post Number:#10
Tue Apr 11, 2017 3:14 pm
Tue Apr 11, 2017 3:14 pm
Posts: 1699
Topics: 38 Images: 301 Solve rating: 233 Joined: Mon Mar 03, 2014 5:59 pm Topics: 38
Age: 39 Location: São Paulo Gender: National Flag:
I didn't told to measure anything.
I told to connect a LED 5mm to test your circuit as shown on schematic.
I told to connect a LED 5mm to test your circuit as shown on schematic.
Post your doubts on forum because it can help another user too. Just PM me for support if it's absolutely necessary.
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