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Using the onboard 3.3v output

Started by ioexception, Jul 06 2015 04:11 AM

Output Ob-Board

Best Answer Chris Walker, 06 July 2015 - 06:07 PM

Hi ioexception,

On the gen2 boards, there's a pin [ (Cpu.Pin)0x12 ] which you can toggle on/off to control the 3V3/5V power headers' output. Any change you've toggled that pin?

Also...many LEDs have a drop-out voltage that's greater than 5V. So you may need to use your 5V header. And, of course...be sure to include a resistor in-line with your LED if you're feeding it from a power source or the LED can be damaged. [I assume you already know and did this...but just being complete.]

Does that help get you running in the right direction?

Chris Go to the full post

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#1 ioexception

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Posted 06 July 2015 - 04:11 AM

Is there any special configuration that I should use to get the onboard 3.3v (or the 5v) output, I'm trying to power some leds but it doesn't work. I'm pretty sure the port works perfect because it outputs power when the board restarts but once my program is loaded the port does not work any more.

Thanks in advance.

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#2 Chris Walker

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Posted 06 July 2015 - 06:07 PM Best Answer

Hi ioexception,

On the gen2 boards, there's a pin [ (Cpu.Pin)0x12 ] which you can toggle on/off to control the 3V3/5V power headers' output. Any change you've toggled that pin?

Also...many LEDs have a drop-out voltage that's greater than 5V. So you may need to use your 5V header. And, of course...be sure to include a resistor in-line with your LED if you're feeding it from a power source or the LED can be damaged. [I assume you already know and did this...but just being complete.]

Does that help get you running in the right direction?

Chris