For Joerg --> voltage divider and arduino

Jun 12, 2016 3 Replies

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gm 10 years ago

Hi Joerg.

I have some strange problem with my setup ( Arduino --> Raspberry ). The system is working perfect but after minute or two, i get HIGH state on RSP pin, but nothing wasn't sent from arduino. I get this states all the time and i can not stop them. They are activated at random cycles.

The funny part is that i can not detect any voltage change ( when this error starts ) and according to the datasheet, voltage from 2.8 - 3.3 is defined as HIGH state.

So, is it possible that RSP is picking some fast impulse from arduino's voltage divider ?

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makolber 10 years ago

open CMOS input?

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gm 10 years ago

open CMOS input? maybe... Good idea.

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Joerg 10 years ago

Yes, I don't know what you mean with RSP pin but if a pin is defined as input and nothing connected to it that pin will float around in level. You'd need to at least give it a pull-up or pull-down resistor.

Regards, Joerg http://www.analogconsultants.com/

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