DIY LED brake lights. Need help.

stupidcar

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stupidcar

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So I have been trying to imitate this idea by making my own led strip.



The idea is cheap. If you fail, you lost abit. But of course I don't wanna lose money.
Super bright red LED: 50 cent
Normal red LED : 20 cent
Resistor : 10 cent
Solder : RM20(Ace Hardware)
All these are cheap!!!

I have been trying to figure it out.
I know red typically are 20mA. But I have read somewhere that a super bright red led is 80mA.
I have tried it on my car battery and it seems fine.
What I'm getting is clear leds but emitting red light. This gives better angle.
While there is an option to use red normal led but its gives 3 times lesser angle of viewing.

Can someone verify this details?
Is this applicable to super bright leds?

Voltage Source (Es): 12 Volts (V)
Voltage drop from LED (Eled): 2 Volts (V)
Current through the LED (Iled): 20 mA
Resitance (R): 500 ohm
Power (P): 0.2 Watts (W)

"If i were to play safe, 15mA is the way then i shall use 700ohms."

HELP! :confused::banghead:

---------- Post added at 04:48 PM ---------- 6 hour anti-bump limit - Previous post was at 03:57 PM ----------

Wah so fast my post kena pushed down.
I really need help!
 

levin818

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levin818

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Hi... in the first place, you need to identifying the recommended current for your Super Bright LED.
Some are 50mA, some 80mA or even 150mA.
And most of the SB LED has forward voltage of 3V, but again, you need to confirm this as well.
Search the datasheet of your LED and you will find the details.
After you find out the forward Current and Voltage, then only you can calculate the require value of resistance.
 

stupidcar

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stupidcar

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Hi... in the first place, you need to identifying the recommended current for your Super Bright LED.
Some are 50mA, some 80mA or even 150mA.
And most of the SB LED has forward voltage of 3V, but again, you need to confirm this as well.
Search the datasheet of your LED and you will find the details.
After you find out the forward Current and Voltage, then only you can calculate the require value of resistance.
i cant because my leds arent in packets.
Its in loose packs. No data seheet whatsoever
The salesman dont even know the datas
 

shiroitenshi

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shiroitenshi

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just use the recommended ones based on max current you expect em to draw, test with each one with the planned resistance and the brightness you expect if cannot find the datasheet

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hAz

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hAz

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so bro,
is your project done?
share some photos pls =)
 

^pomen_GTR^

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^pomen_GTR^

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i cant because my leds arent in packets.
Its in loose packs. No data seheet whatsoever
The salesman dont even know the datas
just sharing....

if normal LED i would use 1k ohm resister from stock 12v supply....

if super bright LED i would use 0.9k ohm resister....

atleas those LED still working more than 2years already with that configuration.....


if u put more LED in series then, need another calculation..but thats out of my reach...donnow how to calculate that..
 

shiroitenshi

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shiroitenshi

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just sharing....

if normal LED i would use 1k ohm resister from stock 12v supply....

if super bright LED i would use 0.9k ohm resister....

atleas those LED still working more than 2years already with that configuration.....


if u put more LED in series then, need another calculation..but thats out of my reach...donnow how to calculate that..
got in google lah, but if don't understand voltage, amperage (inductance) and resistance. kinda difficult to explain.

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^pomen_GTR^

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^pomen_GTR^

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got in google lah, but if don't understand voltage, amperage (inductance) and resistance. kinda difficult to explain.

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i know google got...but since doesnt need it anyway so didn't learn :sleep:
 

shiroitenshi

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shiroitenshi

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Haha, before yeah, now I have all the data dy. Heh.
Will post it up soon in 2 weeks time.
Hope the LEDs come early.
wait till you try making one in the famous knight rider chasing light style.

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Supra_Fanatics

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Supra_Fanatics

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Not gonna do that.
Need other things weh.
I only do normal functioning lights.
Ya get Knight Rider light + talking Alarm! Damn! Your persona is Knight Rider car since is black
haha! :top:
 

shiroitenshi

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shiroitenshi

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U laugh now, when i do u will see nice.
Muahahahaaha. I ain't go no lala taste man
its not about lala taste la. I did it just to learn lol. My car LED bulbs all bought one. SMD type led difficult to solder

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Izso

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Izso

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Told Izso to close this thread but he haven't haha.
Soon, ordered my red led diodes from eBay.
200pcs for RM23 only. :biggrin:
Will post pictures ltr with instructions.
As I told you dude, that's not how we do things in ZTH. You figured it out, share la. You don't have to share the technique or the know how but show your final result la.
 

TitanRev

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Let me help you a bit here la since I've done my own DIY LED 3rd brake light

No.1 you need to find out below
Vs = 12V DC
LED Fv
Normal red ones are 1.9 to 2.1V
High Output about 3 to 4V
mA you intend to supply to the LED 15mA or 20mA higher the brighter but I will put 20mA the max to preserve the life span of the LED
How many LED you want to put in the strip.
Only then you calculate the resistor you need to use. If say you calculated the Ohm to be around 566 or 745 Ohm get the higher than the ones you calculated. 566 you get 600 Ohm 745 you get close to 800Ohm. Also do look into the Watts of the resistor 2Watts is enough for me

My suggestion is that you do all the drawings and calculating on papers 1st before moving to actual project. This is how I do it. You also need to take into consideration the wiring of the multiple LEDs. If wiring multiple LED best to use parallel because if 1 burn others will still light up. If use Series, 1 burn the whole line of LEDs will not light up.

In the below pictures, you will see I'm using parallel series for the entire circuits and I use minis series circuit for each group so if shit happens only 1 group of the LEDs won't light up the rest will still continue to light up.

If I wire all in series, it will draw more current from the source and heats up the wiring because of more current flows. Parallel on the other hand will make all the LED take the same voltage after the resistor and current is spread evenly across all LEDs. This also depends on the individual LED tolerance to voltage variance.
For Knight Rider, not that complicated if you know how to do it. Just go get a running light module and hook it up.

My previous DIY

1st draw out a plan of attack and calculate


2nd fabrication phase


3rd testing and assembling
 
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stupidcar

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stupidcar

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Let me help you a bit here la since I've done my own DIY LED 3rd brake light

No.1 you need to find out below
Vs = 12V DC
LED Fv
Normal red ones are 1.9 to 2.1V
High Output about 3 to 4V
mA you intend to supply to the LED 15mA or 20mA higher the brighter but I will put 20mA the max to preserve the life span of the LED
How many LED you want to put in the strip.
Only then you calculate the resistor you need to use. If say you calculated the Ohm to be around 566 or 745 Ohm get the higher than the ones you calculated. 566 you get 600 Ohm 745 you get close to 800Ohm. Also do look into the Watts of the resistor 2Watts is enough for me

My suggestion is that you do all the drawings and calculating on papers 1st before moving to actual project. This is how I do it. You also need to take into consideration the wiring of the multiple LEDs. If wiring multiple LED best to use parallel because if 1 burn others will still light up. If use Series, 1 burn the whole line of LEDs will not light up.

In the below pictures, you will see I'm using parallel series for the entire circuits and I use minis series circuit for each group so if shit happens only 1 group of the LEDs won't light up the rest will still continue to light up.

If I wire all in series, it will draw more current from the source and heats up the wiring because of more current flows. Parallel on the other hand will make all the LED take the same voltage after the resistor and current is spread evenly across all LEDs. This also depends on the individual LED tolerance to voltage variance.
For Knight Rider, not that complicated if you know how to do it. Just go get a running light module and hook it up.

My previous DIY

1st draw out a plan of attack and calculate


2nd fabrication phase


3rd testing and assembling
I saw urs man. But 3rd brake lights are still okay.
How about the normal brake lights?
When brakes are applied it become brighter. and so on.
When I got my stuffs dy, gonna experiment then.
 
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