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ramps 1.4 board led blinking

zipfactor

ramps 1.4 board led blinking
December 15, 2012 01:34PM

Registered: 11 years ago
Posts: 8

Hey All,

The red led on my prusa with ramps 1.4 electronics blinks while printing. It blinks about as fast as the green led when uploading firmware. Didn't see this when using sprinter firmware, just with the marlin firmware I recently loaded. Any ideas on what this means?

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Greg Frost

Re: ramps 1.4 board led blinking
December 15, 2012 03:23PM

Registered: 13 years ago
Posts: 486

I think it is showing you the control to the heater MOSFET. Is it on solid while the heater is heating?

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zipfactor

Re: ramps 1.4 board led blinking
December 15, 2012 08:30PM

Registered: 11 years ago
Posts: 8

It did not begin to blink until the heated bed reached 105C. The led your referring to does light when the heated bed is heating, and is separate from the led that I'm referring to.

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miso

Re: ramps 1.4 board led blinking
December 15, 2012 08:50PM

Registered: 12 years ago
Posts: 156

zipfactor Wrote:
-------------------------------------------------------
> led that I'm referring to.

Which one? diagram

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zipfactor

Re: ramps 1.4 board led blinking
December 15, 2012 09:41PM

Registered: 11 years ago
Posts: 8

Miso, it is LED4 to which I am referring.

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miso

Re: ramps 1.4 board led blinking
December 16, 2012 05:10AM

Registered: 12 years ago
Posts: 156

According to schematic LED4 is tied to digital PIN 10 which is assigned to EXTRUDER 1 heater in pins.h

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orcinus

Re: ramps 1.4 board led blinking
December 16, 2012 01:15PM

Registered: 12 years ago
Posts: 156

It blinks because that is the way PID temperature control works in Marlin.
The frequency of blinking should stay fixed, with the duty cycle changing.

As it approaches the target temperature, the duty cycle will get shorter and shorter, transitioning from always on to blinkier and blinkier.