Forum Members section DIY Ferduino controller Module operation of Relays-2 and PCF8575

Module operation of Relays-2 and PCF8575

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Post Number:#21 Post Sat Apr 13, 2019 1:43 pm
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Hi!

If do you have problem yet can you answer my last question?

I thought the problem was solved.

Best regards.
Please do not PM me for support unless it is absolutely necessary.

I'll not write custom function to nobody unless you can pay for my job.

Post Number:#22 Post Sun Apr 14, 2019 7:37 am
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Sorry, I was still doing tests, the voltage was about 0.37 v and continued with the same problems. I used another 5v relay module and another PCB with a different PCF8575 and still had the same problems. I had left it as impossible and decided not to use the PCF module even if I limited some of the functionalities.

As soon as the new module that Gio indicated that it worked for me, I will try and comment on it.

Regards,

Post Number:#23 Post Sun Apr 14, 2019 10:47 am
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Joined: Mon Mar 03, 2014 5:59 pm
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The voltage should be around 1.5 V with ULN connected.

Disconnect the ULN and measure the voltage. It should be 5V.

Maybe the input voltage on PCF is less than 5V.
Please do not PM me for support unless it is absolutely necessary.

I'll not write custom function to nobody unless you can pay for my job.

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