Difference between revisions of "User:Chotee/NoFeedback-ManagementIntervention"

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1mx1m screen of RGB lights that slowly and independently change colour. All patterns are just your mind playing tricks on you.  
 
1mx1m screen of RGB lights that slowly and independently change colour. All patterns are just your mind playing tricks on you.  
 +
 +
Alternative name:
 +
* Free-Runner / Management-Intervention
  
 
== Parts ==
 
== Parts ==
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** max led forward current is 20mA.
 
** max led forward current is 20mA.
 
** RGBs forward-voltage oscillates between 3.2v and 3.8v (±15%)
 
** RGBs forward-voltage oscillates between 3.2v and 3.8v (±15%)
−
** LEDs max continious current at 20mA.  
+
** LEDs max continuous current at 20mA.  
 
* 22x22 leds (484) [sqrt(500) = 22.36..]
 
* 22x22 leds (484) [sqrt(500) = 22.36..]
−
* Powered by 12v PC PSU or 20v LT power-brick.
 
  
−
=== 12v ===
+
=== 20v supply ===
−
* 12v/3.8 (V-max-led-forward) = 3.15 LEDs; 3 LEDs in a chain.
 
−
* There are 161+1/3 chains [484/3]
 
−
* Vmax = 3 * 3.8Vf = 11.4v; 0.6v left.
 
−
* Vmin = 3 * 3.2Vf = 9.6v; 2.4v left.
 
−
* current limit power-max: 2.4v*20mA = 48mW.
 
−
* Total Current: 20mA * 162 = 3.24A
 
−
* Total power: 3.24A * 12v = 38.8w
 
−
 
 
−
=== 20v ===
 
 
* 20v/3.8 (V-max-led-forward) = 5.2 LEDs; 5 LEDs in a chain.
 
* 20v/3.8 (V-max-led-forward) = 5.2 LEDs; 5 LEDs in a chain.
 
* There are 96.8 chains [484/5]
 
* There are 96.8 chains [484/5]
Line 33: Line 26:
 
* Total Current: 20mA * 97 = 1.94A
 
* Total Current: 20mA * 97 = 1.94A
 
* Total power: 1.94A * 20v = 38.8w
 
* Total power: 1.94A * 20v = 38.8w
 +
* 22 leds; 4x5led chain + 1x2led chain.
 +
** 2 led chain needs a 470ohm ¼Watt resistor (or 2x1000ohm in paralel) to drop the voltage.
  
 
== Components ==
 
== Components ==
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* Rs = 10
 
* Rs = 10
 
* Opamp >20v;  
 
* Opamp >20v;  
−
** OPL best fit: LM358DR  (But has two channels) -- €1.17 (100pcs) -- https://nl.aliexpress.com/item/10PCS-LM358DR-SOP8-LM358-SOP-LM358DT-SMD-LM358DR2G-new-and-original-IC-free-shipping/32533323519.html
 
 
** *Single* channel opamp: LM321 -- €1.99 (100pcs) -- https://nl.aliexpress.com/item/Free-Shipping-100PCS-100-NEW-LM321MFX-LM321MF-LM321-A63A-SOT23-5/1924012475.html -- http://www.ti.com/lit/ds/symlink/lm321.pdf
 
** *Single* channel opamp: LM321 -- €1.99 (100pcs) -- https://nl.aliexpress.com/item/Free-Shipping-100PCS-100-NEW-LM321MFX-LM321MF-LM321-A63A-SOT23-5/1924012475.html -- http://www.ti.com/lit/ds/symlink/lm321.pdf
 
* Mosfet. >20v; >20mA:  
 
* Mosfet. >20v; >20mA:  
 
** From the OPL: BSS138W-7-F; 50V; 200mA -- €1.36 (100pcs) -- https://nl.aliexpress.com/item/50PCS-BSS138LT1G-SOT23-BSS138-SOT-MOSFET-SMD-new-and-original-IC-free-shippin/32518915182.html -- http://www.onsemi.com/pub/Collateral/BSS138LT1-D.PDF
 
** From the OPL: BSS138W-7-F; 50V; 200mA -- €1.36 (100pcs) -- https://nl.aliexpress.com/item/50PCS-BSS138LT1G-SOT23-BSS138-SOT-MOSFET-SMD-new-and-original-IC-free-shippin/32518915182.html -- http://www.onsemi.com/pub/Collateral/BSS138LT1-D.PDF
 +
* a 100nF capacitor as small voltage buffer.
  
−
=== Verifying LEDs ===
+
== Circuit ==
−
The LEDs arrived. Lets verify their specifications
 
−
 
 
−
{| class="wikitable"
 
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|-
 
−
! # |
 
−
! colspan="2" | I=20mA
 
−
! colspan="2" | I=15mA
 
−
! colspan="2" | I=10mA
 
−
|-
 
−
! Nr
 
−
! V_min
 
−
! V_max
 
−
! V_min
 
−
! V_max
 
−
! V_min
 
−
! V_max
 
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== Circuit:
 
 
[from http://www.falstad.com/circuit/circuitjs.html]
 
[from http://www.falstad.com/circuit/circuitjs.html]
 
<pre>
 
<pre>

Latest revision as of 17:08, 5 April 2018

1mx1m screen of RGB lights that slowly and independently change colour. All patterns are just your mind playing tricks on you.

Alternative name:

  • Free-Runner / Management-Intervention

Parts

Electronics

  • 500 Slow color changing RGB leds.
    • max led forward current is 20mA.
    • RGBs forward-voltage oscillates between 3.2v and 3.8v (±15%)
    • LEDs max continuous current at 20mA.
  • 22x22 leds (484) [sqrt(500) = 22.36..]

20v supply

  • 20v/3.8 (V-max-led-forward) = 5.2 LEDs; 5 LEDs in a chain.
  • There are 96.8 chains [484/5]
  • Vmax = 5 * 3.8Vf = 19v; 1v left.
  • Vmin = 5 * 3.2Vf = 16v; 4v left.
  • current limit power-max: 4v*20mA = 80mW.
  • Total Current: 20mA * 97 = 1.94A
  • Total power: 1.94A * 20v = 38.8w
  • 22 leds; 4x5led chain + 1x2led chain.
    • 2 led chain needs a 470ohm ¼Watt resistor (or 2x1000ohm in paralel) to drop the voltage.

Components

Circuit

[from http://www.falstad.com/circuit/circuitjs.html] 

$ 1 0.000005 10.20027730826997 50 5 50
w 544 592 416 592 0
w 416 576 416 592 0
v 416 576 416 176 0 0 40 20 0 0 0.5
g 416 592 416 624 0
w 416 176 544 176 0
w 544 176 544 336 0
f 688 464 752 464 0 1.5 0.02
162 752 272 752 320 1 3.2 1 0 0 0.01
162 752 320 752 368 1 3.2 1 0 0 0.01
162 752 368 752 416 1 3.2 1 0 0 0.01
r 752 528 752 592 0 10
w 544 592 608 592 0
w 608 592 752 592 0
w 544 560 544 592 0
w 752 480 752 528 0
w 752 528 608 528 0
w 608 480 608 528 0
w 544 448 608 448 0
a 608 464 688 464 1 12 0 1000000 0.11134962704993533 0.11137629276054098
r 544 352 544 448 0 100000
w 544 352 544 336 0
r 544 448 544 560 0 560
162 752 224 752 272 1 3.2 1 0 0 0.01
162 752 176 752 224 1 3.2 1 0 0 0.01
w 752 416 752 448 0
w 752 416 688 416 0
c 688 416 688 176 0 1.0000000000000001e-7 -14.836678863009816
w 544 176 688 176 0
w 688 176 752 176 0
o 26 64 0 4099 20 0.00009765625 0 2 26 3
o 6 64 0 4099 20 0.05 1 2 6 3
o 10 64 0 4099 0.625 0.05 2 2 10 3
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