how to make a voltage into an input?

Community Projects
1

I want to make a pulse voltage like a turn signal into an input so it can run on ardunio MC. Anybody know the best approach? I was also wondering if i can make the signal from pulse into a constant signal voltage? Can i use this somehow as a logic gate input?

2

Hello d.brne2,

You can configure the Arduino’s Digital I/O pins to handle a digital High input, such as a pulse. It would act similar to a button push. You’ll most likely use the [digitalRead() function. Set an if() statement that will trigger once the digitalRead() signal goes high. Make sure that the digital pin is tied to ground with a 1k, 2.2k, or 4.7k resistor so it’s not left floating.](digitalRead() - Arduino Reference)

3

Thank you for responding! I did what you said and it did not work for what i am doing. Yes the output did for digitalRead did work if i used it as a button or connected it to ground. But what i need is to use an external voltage signal to act as an input. This input would be converted into a HIGH or LOW connection that i can use within the Arduino and program., whether the voltage is on or off. Can this be done?

4

Are you wanting to read this signal as an Analog input?

What voltages are you working with?

5

depends on what is more compatible and stable. if i can read it as an analog yes great. But if i can read it as a digital low or high even better. im working with a 12v pulse signal.

6

i used the digital signal as an input like you recommended, which i created an open circuit and hooked up a relay connected to my external voltage source. this relay closed the digital output giving me my results i wanted but im curious to know if i can bypass this relay system completely. to convert this external pulse signal into a constant and use it directly into the mirco controller.

7

What are your thoughts? What do you think i should go with? The relay system isn’t bad, it would completely separate the power sources, which is a good thing.

8

12v DC

9

Hello,

At this point, I think this project is out of scope for Technical Support. However, this is still a fantastic post for the community. I wish you the best of luck with your project.