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 Forum index » DIY Hardware and Software » Arduino
Change from common anode to common cathode LED
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Mick Bailey



Joined: Jan 07, 2010
Posts: 15
Location: England

PostPosted: Tue Feb 22, 2022 3:24 am    Post subject: Change from common anode to common cathode LED Reply with quote  Mark this post and the followings unread

I've breadboarded the Hagiwo Arduino Nano quantizer and it works fine, but prefer the functions of the Luislutz version here:https://github.com/luislutz/Arduino_Quantizer

This appears to work except for the LED which was originally common cathode, but in the Luislutz version is common anode. What changes need to be made to the code to use common cathode? I've looked at various Arduino tutorials for this but can't see any similarity to the quantizer code, so any help would be appreciated.
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Blue Hell
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Joined: Apr 03, 2004
Posts: 23967
Location: The Netherlands, Enschede
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PostPosted: Tue Feb 22, 2022 8:07 am    Post subject: Reply with quote  Mark this post and the followings unread

At the bottom of the .ino it says :

Code:
void LED(byte R, byte G, byte B) {


 analogWrite(9,255-map(R,0,255,0,LED_Brightness));
 analogWrite(11,255-map(G,0,255,0,LED_Brightness));
 analogWrite(10,255-map(B,0,255,0,LED_Brightness));
}


And withe the inverted LED common-ness I'd assume this has to be be inverted too .. as in

Code:
void LED(byte R, byte G, byte B) {


 analogWrite(9,map(R,0,255,0,LED_Brightness));
 analogWrite(11,map(G,0,255,0,LED_Brightness));
 analogWrite(10,map(B,0,255,0,LED_Brightness));
}

_________________
Jan
also .. could someone please turn down the thermostat a bit.
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Mick Bailey



Joined: Jan 07, 2010
Posts: 15
Location: England

PostPosted: Wed Feb 23, 2022 2:10 am    Post subject: Reply with quote  Mark this post and the followings unread

Ah! I see how this works now you've pointed out where the code needs to be changed. I've just tried this and it works fine, though there's on issue in that the LED isn't sufficiently illuminated and each individual LED can be seen as a result. With the Hagiwo code this worked fine.

Does line 43 need changing to fix this - int LED_Brightness = 50; ?
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