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Topic: Arduino digital input, 80Vdc (Read 6 times) previous topic - next topic

Sergegsx

Oct 11, 2012, 08:09 am Last Edit: Oct 11, 2012, 09:02 am by Sergegsx Reason: 1
Hello,
Please can anyone help me out in this, I need to be able to read with an arduino digital pin a DC voltage that can go from 60 to 80Vdc. I would like it to be isolated, maybe a optocoupler? How can I find one that meets this requirements?

as far as i know, I dont need any additional circuit, right?


Thank you very much for your help.
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Graynomad

How does that circuit read the 80v, the opto is the wrong way around.

As it is it controls the LED.
_____
Rob
Rob Gray aka the GRAYnomad www.robgray.com

Sergegsx

#2
Oct 11, 2012, 09:05 am Last Edit: Oct 11, 2012, 10:24 am by Sergegsx Reason: 1
hi, sorry about that, I copied the wrong image from google images, just wanted to show the basic setup to connect the optocoupler. in case i was missing something. I have removed the picture so it does not confuse other people.

the idea is I have a 60 to 80Vdc input, that I need to detect using a digital pin.

is there any optocoupler or any other method where I can just put the 80Vdc and ground to it, and then get a signal which i can feed to the arduino input pin safely?

thank you Graynomad !!
* Si preguntas, pon el código de tu programa, hace mucho mas fácil ayudarte. Y me ahorro un mensaje pidiendo que lo hagas.
* Si consigues solucionar tu problema, dedica unos minutos a explicar en tu post como lo conseguiste para beneficio de todos.
* Cambia el 'Subject' de tu hilo y añade 'SOLUCIONADO' cuando hayas llegado a una solución al problema que planteaste.
* Utiliza un 'Subject' para tu hilo que explique de que va el hilo.
Si estas empezando:
* Comienza a usar Arduino
* Guías de iniciación a Arduino
* Ejemplos
* Referencia del Lenguaje
* Conceptos básicos
Guia de usuario de arduino
Tutoriales en Ingles
Si necesitas que alguien te escriba el código: http://www.freelancer.com/  o esta  http://www.guru.com/

dc42

See attached. The diode in parallel with the input side of the optocoupler is needed only if there is a possibility of the polarity of the 60-80V input reversing. Enable the internal pullup on the digital input pin.
Formal verification of safety-critical software, software development, and electronic design and prototyping. See http://www.eschertech.com. Please do not ask for unpaid help via PM, use the forum.

fungus


hi, sorry about that, I copied the wrong image from google images, just wanted to show the basic setup to connect the optocoupler. in case i was missing something. I have removed the picture so it does not confuse other people.

the idea is I have a 60 to 80Vdc input, that I need to detect using a digital pin.

is there any optocoupler or any other method where I can just put the 80Vdc and ground to it, and then get a signal which i can feed to the arduino input pin safely?


If it's just 80V DC then get two resistors in the ratio of 16:1 and wire them in series with the small resistor connected to ground. The voltage in between them will be one sixteenth of the input voltage.

You only need opto-isolators if you don't really know what might be connected to the input or if there's the possibility of big voltage surges. eg. they're used in music equipment which has hundreds of cables with interchangeable plugs which need to be connected in a hurry (usually in semi-darkness).
No, I don't answer questions sent in private messages (but I do accept thank-you notes...)

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