Markings on PCB and cathodes

[sydney-d]

Hello,

Can you confirm that these markings always refer to the cathodes for all LEDs ?

I have trouble making LEDs work.
By using the continuity tester on my multimeter I have been able to materialize these tracks :

For example I'm able to light an LED like this (3v to the anode, gnd to the cathode, cathode to the marking)

But the only way to turn on two consecutive LEDs is like this :

Which seems to indicate that for the LEDs to work the (conventional) current have to flow from D17 to D16, the opposite of how the PCB seems to have been designed ?

Should I ignore the markings ? Only for the red LEDs ?

Thank you for your help, I've been pulling my hair and wasting components on this one for way too long :D

[sydney-d]

I Also notice a difference in the markings between the gerber files, and the kicad file here

Gerber file :

Kicad file from readme:

Notice the red arrows showing different markings

Is the gerber files up to date ?

Best

[jackw01]

I also ran into this issue when building the PCB, since I found out the hard way that color 2835 LEDs do not have standardized polarization (some have the anode on the large pad and some have the anode on the small pad). The gerber file is up-to-date and should work with either the LEDs specified in the bom.csv file, or all Cree JE2835 series LEDs, as long as the LEDs are mounted with their pads matching the pad shapes on the PCB footprint rather than following the polarity markings on the PCB. The Kicad screenshot in the readme does show an older revision of the board file.

What LED part numbers are you using?