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by Pijus_magnificus
Wed Nov 14, 2012 2:26 pm
Forum: HATs and other add-ons
Topic: How to sense a 5v input with GPIO
Replies: 18
Views: 52925

Re: How to sense a 5v input with GPIO

Many thanks for the answers, Its only a unidirectional input signal. A simple movement sensor. 5v --> movement detected 0V --> No movement detected I think I will keep the first circuit, that I hope is safe enough http://s3.subirimagenes.com:81/imagen/previo/thump_8122746test1.png Thanks for the ans...
by Pijus_magnificus
Tue Nov 13, 2012 10:43 pm
Forum: HATs and other add-ons
Topic: How to sense a 5v input with GPIO
Replies: 18
Views: 52925

How to sense a 5v input with GPIO

Hi there Only a fast question. I would like to sense a 5v input with my pi using the GPIO. I know that I need to limit the current and drop down the volts to 3.3v. And my question is: Is enought with a simple resistive divisor like this one (see test1.png) Or I need to put some additional resistor-z...

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