Current draws and voltage drops for WS2811 5V Square pixels

[AussiePhil]

Hi all.
This work supersedes any other published numbers for 2811 pixels that is currently pinned.

These results are based on four 100 count strings of Ray Wu square 2811 pixels, 5v, 100mm (4") spacing. Pigtails as supplied by Ray. The power injection however is custom made designed to minimise any voltage drop (insertion loss)
I do have insertion loss figures for the power injection cables by themselves and will post them in and update

Test setup looked like


Doing baseline testing of a 100 count string

Testing Parameters
Total Pixels	400
Pixel Type	2811 Square
Pixel Voltage	5 volts
String Length	100
150mm Ray Wu pigtails
Power Injection	Custom connector
Pixel wire Size	Chinese 18awg - real estimated gauge 23awg - This is the thickest you can buy
PI wire size	0.75mm
PI Length	1m
Loop Length - DC	80 metres
Pixel Length	40 metres
Loop Resistance for 100	2.16 Ohms
Loop Resistance for 400	8.00 Ohms
Quiescent Current no signal	250mA
Quiescent Current Black data	290mA
Voltage Output from PSU	5.01 volts

The eagled eyed people will note the current meter shows 5.08, both of those meters read a fraction high

Baseline - 100 Pixel String - 100% Brightness	100.0
Power in start of string only -
Colour	Voltage In	Voltage Mid	Voltage End	Current	Average Pixel Current mA
Red	4.89		3.48	1.49	14.9
Green	4.9		3.81	1.31	13.1
Blue	4.9		3.81	1.31	13.1
Purple	4.84		3.05	2.11	21.1
Cyan	4.85		3.08	1.96	19.6
Yellow	4.84		3.05	2.12	21.2
White	4.8		2.86	2.55	25.5

Results for 200, 300 and 400 continued below........

 

[AussiePhil]

... Continued for 200 pixels tested

Baseline - 200 Pixel String - 100% Brightness	200.0
Power in start of string only - V at 0 -100 - 200
Colour	Voltage In	Voltage Mid	Voltage End	Current	Average Pixel Current mA
Red	4.86	2.77	2.3	1.75	8.8
Green	4.88	3.15	2.75	1.51	7.6
Blue	4.89	3.23	2.87	1.48	7.4
Purple	4.82	2.62	2.22	2.13	10.7	Red around 110 pixels
Cyan	4.82	2.62	2.22	2.22	11.1	Red around 110 pixels
Yellow	4.82	2.56	2.18	2.25	11.3	Red around 110 pixels
White	4.79	2.49	2.15	2.61	13.1	Red around 100
White at 30% had a little pink but major flicker
Baseline - 200 Pixel String - 100% Brightness	200.0
Power insert at 0 and 200 - V at 0 -100 - 200
Colour	Voltage In	Voltage Mid	Voltage End	Current	Average Pixel Current mA
Red	4.87	3.45	4.87	2.95	14.8
Green	4.89	3.78	4.89	2.58	12.9
Blue	4.89	3.78	4.89	2.58	12.9
Purple	4.81	3.05	4.81	4.15	20.8
Cyan	4.83	3.25	4.83	3.84	19.2
Yellow	4.81	3.02	4.81	4.18	20.9
White	4.77	2.83	4.77	4.77	23.9
White 50%	4.85	3.38	4.85	3.3	16.5
Baseline - 200 Pixel String - 100% Brightness	200.0
Power insert at 0 -100 - 200 - V at insert
Colour	Voltage In	Voltage Mid	Voltage End	Current	Average Pixel Current mA
Red	4.92	4.92	4.92	3.23	16.2
Green	4.92	4.92	4.92	3.22	16.1
Blue	4.92	4.92	4.92	3.23	16.2
Purple	4.83	4.83	4.83	5.95	29.8
Cyan	4.84	4.84	4.84	5.94	29.7
Yellow	4.84	4.84	4.84	5.91	29.6
White	4.74	4.74	4.74	7.92	39.6

 

[AussiePhil]

.... continued for 300 pixels

Baseline - 300 Pixel String - 100% Brightness	300.0
Power insert at 0 and 300 - V at 0 -100 - 300
Colour	Voltage In	Voltage Mid 100 point	Voltage End	Current	Average Pixel Current mA
Red	4.85	2.92	4.85	3.36	11.2
Green	4.87	3.29	4.87	2.87	9.6
Blue	4.87	3.34	4.87	2.85	9.5
Purple	4.79	2.71	4.79	4.33	14.4	Red evident
Cyan	4.81	2.94	4.81	3.99	13.3
Yellow	4.79	2.65	4.79	4.38	14.6	Red Orange
White	4.76	2.56	4.76	5.08	16.9	Red Middle 100
White 50%	4.85	3.09	4.85	3.23	10.8
Baseline - 300 Pixel String - 100% Brightness	300.0
Power insert every 100 - V at 0 -100 - 300
Colour	Voltage In	Voltage Mid 100 point	Voltage End	Current	Average Pixel Current mA
Red	4.9	4.9	4.9	4.84	16.1
Green	4.9	4.9	4.9	4.81	16.0
Blue	4.9	4.9	4.9	4.84	16.1
Purple	4.81	4.81	4.81	8.84	29.5
Cyan	4.81	4.81	4.81	8.51	28.4
Yellow	4.81	4.81	4.81	8.8	29.3
White	4.81	4.81	4.81	11.6	38.7

 

[AussiePhil]

Continued for 400 pixels

400 Pixel String - 100% Brightness	400.0
Power insert at 0 - 200 - 400 - Voltage at 0 -100 - 400
Colour	Voltage In	Voltage Mid 100 point	Voltage End	Current	Average Pixel Current mA
Red	4.84	3.4	4.84	5.84	14.6
Green	4.86	3.68	4.86	5.06	12.7
Blue	4.87	3.74	4.87	5.06	12.7
Purple	4.77	3.02	4.77	8.07	20.2
Cyan	4.79	3.21	4.79	7.44	18.6
Yellow	4.78	2.98	4.78	8.18	20.5
White	4.73	2.8	4.73	9.6	24.0
White 50%	4.82	3.33	4.82	6.47	16.2
400 Pixel String - 100% Brightness	400.0
Power insert every 100
Colour	Voltage In	Voltage Mid 100 point	Voltage End	Current	Average Pixel Current mA
Red	4.91	4.91	4.91	6.58	16.5
Green	4.91	4.91	4.91	8.93	22.3
Blue	4.91	4.91	4.91	6.58	16.5
Purple	4.83	4.83	4.83	11.07	27.7
Cyan	4.84	4.84	4.84	11.64	29.1
Yellow	4.83	4.83	4.83	12.02	30.1
White	4.77	4.77	4.77	15.96	39.9
White 50%	4.88	4.88	4.88	8.87	22.2

 

[AussiePhil]

Reserved for insertion loss numbers

 

[MichaelF5]

Awesome, Thankyou!