Control 5V relay with my BeagleBone Black GPIO

[cmc...@gmail.com]

Hi,

I have a 5V Relay shield to control with my BBB, i know the GPIO work with 3.3V, i see an instructable that i can shunt the leds in my relay shield and it will work, it is safe for my bbb to do that? 

Modifications for Driving a 5V relay module from a 3.3V Arduino board

My relay board:

Relay Board

Thanks,

[William Pretty Security]

Hi;

 

I took a look at both circuits.

There’s uses an opto-isolator, so shorting the LED should work.

 

In your case, the 1K resistor on the base will load the GPIO too much.

I used a 10K base resistor with a 100K pull down.

Basically multiply both of your values by 10 and you8 should be fine.

I would hook the LED in parallel with the relay coil.

 

Good Luck

 

Bill

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[cmc...@gmail.com]

Hi bill,

Thanks for your help, so i just have to replace the resistors by new ones, for Leds what is your idea to connect them to relay coil?

[William Pretty Security]

You should be able to just the replace the resistors.

On second thought, the LED across the coil was a bad idea.

 

Maybe someone else has a suggestion on that one.

 

 

"No one could make a greater mistake than he who did nothing because he could do only a little."

"All that is necessary for the triumph of evil is that good men do nothing" Edmond Burke (1729 - 1797)

http://www.packtpub.com/building-a-home-security-system-with-beaglebone/book

http://ca.linkedin.com/pub/bill-pretty/2b/b07/602

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