Comments on: Aurora 9×18 and 18×18 Firmware Update https://blog.theledart.com/blog/aurora-9x18-and-18x18-firmware-update/ Art and Technology are Friends Tue, 18 Aug 2020 10:01:26 +0000 hourly 1 http://wordpress.org/?v=3.9.1 By: The LED Artist https://blog.theledart.com/blog/aurora-9x18-and-18x18-firmware-update/comment-page-1/#comment-5153 Sun, 24 Mar 2013 18:21:51 +0000 http://www.theledart.com/blog/?p=1479#comment-5153 I think you are getting it. PWM hardware is set @ 16000/(pr_value+1), where 16000 (kHz) is the processor instruction frequency.
Software goes though each PWM cycle 127 times per each color. Also there’s one cycle for data processing.
Tcy in the formula is minimal pulse duration of PWM, which is 62.5ns.

]]> By: smileyam https://blog.theledart.com/blog/aurora-9x18-and-18x18-firmware-update/comment-page-1/#comment-5095 Wed, 20 Mar 2013 02:46:54 +0000 http://www.theledart.com/blog/?p=1479#comment-5095 Hi,artist

what’s the base time of a PWM? can you write each Pulse time on your time chart?

;— PWM timing parameters —————————–
; LED refresh time = (pr_value+1)*(3*127+1)*Tcy = (pr_value+1)*382*Tcy
; optimized for video @225 Hz

i am not very sure about the explain here.

(PR+1)*Tcy is the PWM period. and 3 RGB color divided into 128 duty?

]]> By: smileyam https://blog.theledart.com/blog/aurora-9x18-and-18x18-firmware-update/comment-page-1/#comment-5089 Tue, 19 Mar 2013 15:34:38 +0000 http://www.theledart.com/blog/?p=1479#comment-5089 HI,artist，

is hard to understand the code of 9*18 here,

;— PWM timing parameters —————————–
; LED refresh time = (pr_value+1)*(3*127+1)*Tcy = (pr_value+1)*382*Tcy
; optimized for video @225 Hz

the datasheet of PIC24FV301 says, PWM Period = [Value + 1] x TCY x (Prescaler Value)

according the the formula, what’s 3*127 ?

]]> By: The LED Artist https://blog.theledart.com/blog/aurora-9x18-and-18x18-firmware-update/comment-page-1/#comment-3254 Tue, 08 Jan 2013 17:10:14 +0000 http://www.theledart.com/blog/?p=1479#comment-3254 Hello,

Thanks for your comment!
The PCBs are available here and here..

Aki

]]> By: Cha Yah https://blog.theledart.com/blog/aurora-9x18-and-18x18-firmware-update/comment-page-1/#comment-3253 Tue, 08 Jan 2013 17:05:30 +0000 http://www.theledart.com/blog/?p=1479#comment-3253 Hi,

I like the 9×18 aurora project alot. I saved a copy of the schematic for my preference, but do you happen to have the PCB. Let me know if I can obtain one.

….The colors are awesome!!!

Thanks,

Cha

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