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by RaspNew01
Tue Jul 02, 2019 12:55 pm
Forum: Automation, sensing and robotics
Topic: how to control 24VDC valve with ULN2803A?
Replies: 25
Views: 2773

Re: how to control 24VDC valve with ULN2803A?

Hello pcmanbob,

it turned out that you were right and there was no need for the resistor at all. Now everything works perfect.

Thank you again very much!!!
by RaspNew01
Wed Jun 19, 2019 8:20 pm
Forum: Automation, sensing and robotics
Topic: how to control 24VDC valve with ULN2803A?
Replies: 25
Views: 2773

Re: how to control 24VDC valve with ULN2803A?

Hello pcmanbob,

thank you for your fast reply. This is great info. So basically all the problems stem from the resistor.

Ok I will do It again, this time leaving the resistor array away.

Thank you a lot, I will come back with the results.

Thanks again!
by RaspNew01
Tue Jun 18, 2019 7:51 pm
Forum: Automation, sensing and robotics
Topic: how to control 24VDC valve with ULN2803A?
Replies: 25
Views: 2773

Re: how to control 24VDC valve with ULN2803A?

Thank you guys so much for the fast replies. I will first have to figure out what all those information mean, but I will try to test my setup. Actually all the components I am using are new, so I should not have a problem with the Chip isn't it? Propably you never know till you test it :D Also I am ...
by RaspNew01
Tue May 28, 2019 1:49 pm
Forum: Automation, sensing and robotics
Topic: how to control 24VDC valve with ULN2803A?
Replies: 25
Views: 2773

Re: how to control 24VDC valve with ULN2803A?

Hello pcmanbob, thank you very much for your fast reply. i didn't programm anything yet so far, I just wanted it to work first, hence I am using Python to controll the gpio's directly. The board is connected to the GND PIN 9; GPIO 5, 6, 13, 19, 26, 16, 20 and 21. have you tried checking that you are...
by RaspNew01
Tue May 28, 2019 11:00 am
Forum: Automation, sensing and robotics
Topic: how to control 24VDC valve with ULN2803A?
Replies: 25
Views: 2773

Re: how to control 24VDC valve with ULN2803A?

Hello everyone, first of all thank you for sharing your project and giving some hints how to realize it. I have to some extend a very similiar setup, but it won't work. To figure where my mistake is, I would very appreciate if someone can take a look my work (pictures attached). What did i do wrong?...

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