DIY LED brake lights. Need help.

[levin818]

Ok can you please take a closer picture and show it here once more?

 

[stupidcar]

Ok can you please take a closer picture and show it here once more?

I'm gonna go swap my 1/4W resistor with 2W then I'm done. 1 step closer!
By using this http://led.linear1.org/led.wiz ,
13V source, 2.8 forward V and 20mA, it came out with 4 Leds to a 100ohm 1/4W resistor.
Why is the wizard giving me that answer ah?

This is my spec sheet btw. No wattage value. I don't know how to count so I rely on calculators, manatau its wrong.

 

[stupidcar]

Anyone?

 

[TitanRev]

stupidcar, I can't see your image la...also you no need to 100% follow the site give you the W.

 

[levin818]

I'm gonna go swap my 1/4W resistor with 2W then I'm done. 1 step closer!
By using this LED series parallel array wizard ,
13V source, 2.8 forward V and 20mA, it came out with 4 Leds to a 100ohm 1/4W resistor.
Why is the wizard giving me that answer ah?
This is my spec sheet btw. No wattage value. I don't know how to count so I rely on calculators, manatau its wrong.

If you follow the web site suggestion, you can use 100ohm 1/4W resistor.
The reason i suggest you to change it to 2W is because i assumed you connect the LED in parallel.

 

[stupidcar]

stupidcar, I can't see your image la...also you no need to 100% follow the site give you the W.

If you follow the web site suggestion, you can use 100ohm 1/4W resistor.
The reason i suggest you to change it to 2W is because i assumed you connect the LED in parallel.

Guys, I reuploaded the pics. BTW, I used the same method as the wizard showed me ma.

 

[TitanRev]

Stupidcar, you read the website suggestion carefully.

Pick from website
the wizard thinks 1/4W resistors are fine for your application

Also pick from the ? mark
Resistor power rating
The wizard uses your drive current to calculate the power dissipated in the array resistors. Standard resistors are available in 1/8W, 1/4W, 1/2W and 1W, and some values are available above that. The wizard picks a resistor wattage for you based on the guideline of operating at less than 60% of the rated power.

W in resistor is the power rating of the resistor. In other words, after you have designed your circuit, you look at the selected resistors, and you calculate the power dissipated (I) Power = current x voltage (P=V/R, or P= V2 /R or P= I2 x R- you MUST select resistors with a power rating that exceeds the result.

You can use this to calculate the resistor Wattage
20mA x 2.8 = 0.056 watt of power required. This is 1 LED.

From the picture can see you resistor all black already..overheated. This means your resistor is not enough. You give me your intended LED nos. I work out the wiring diagram for you.

 

[stupidcar]

Stupidcar, you read the website suggestion carefully.

Pick from website
the wizard thinks 1/4W resistors are fine for your application

Also pick from the ? mark
Resistor power rating
The wizard uses your drive current to calculate the power dissipated in the array resistors. Standard resistors are available in 1/8W, 1/4W, 1/2W and 1W, and some values are available above that. The wizard picks a resistor wattage for you based on the guideline of operating at less than 60% of the rated power.

W in resistor is the power rating of the resistor. In other words, after you have designed your circuit, you look at the selected resistors, and you calculate the power dissipated (I) Power = current x voltage (P=V/R, or P= V2 /R or P= I2 x R- you MUST select resistors with a power rating that exceeds the result.

Will go home and count it up! Thanks again.

 

[TitanRev]

Stupidcar, I just worked out a wiring diagram for you. You can test it out. My spec is like below. I use 14V as engine started the Voltage is about that range. You can use 100 Ohm resistor @ 1W. Calculated actual Ohm is 82 but I go higher for safety. You can try 110 Ohm also but LED less bright.
Vs = 14V
LED = 3v
Current = 25mA

 

[stupidcar]

Stupidcar, I just worked out a wiring diagram for you. You can test it out. My spec is like below. I use 14V as engine started the Voltage is about that range. You can use 100 Ohm resistor @ 1W. Calculated actual Ohm is 82 but I go higher for safety. You can try 110 Ohm also but LED less bright.
Vs = 14V
LED = 3v
Current = 25mA

Dude! You don't have to... ahaha paiseh. Thing is my specs is 20mA.
I don't mind my lights to be dimmed abit. Its still an ultrabright with 4000-5000mcd and also 120-140 degree. Wouldn't lose too much brightness I guess.

 

[TitanRev]

Stupidcar, just helping out fellow forummers here....next time belanaj me teh tarik la...Muahahaha

 

[vr2turbo]

Stupidcar, just helping out fellow forummers here....next time belanaj me teh tarik la...Muahahaha

Must be a really good cup of teh tarik for you to come up from the south.....

 

[stupidcar]

Stupidcar, just helping out fellow forummers here....next time belanaj me teh tarik la...Muahahaha

Must be a really good cup of teh tarik for you to come up from the south.....

Haha Why didn't you guys appear earlier, especially TR?
I was damn eager to do this, so I failed.
Teh Tarik cannn.

So 1 Watt is enough?

---------- Post added at 11:28 PM ---------- 6 hour anti-bump limit - Previous post was at 09:13 PM ----------

It's big already what.

Oh ya, the black thing is what?
I'm reading back everything.
And if without the black thing. Will it short it when both side are on?

 

[vr2turbo]

Bro., I am not into electronics and I know that is the driver they were talking about, because connection is brake light with tail light function.....

 

[stupidcar]

Bro., I am not into electronics and I know that is the driver they were talking about, because connection is brake light with tail light function.....

Without them can function? hahaha

 

[vr2turbo]

Without them can function? hahaha

Yup, I asked before how to have dimmer tail light and at same time become brighter when brakes are applied....

 

[Izso]

Oh ya, the black thing is what?
I'm reading back everything.
And if without the black thing. Will it short it when both side are on?

That black thing is a diode. It controls the flow of electrons so it doesn't go back. I would say without the diode there'll be a short circuit everytime your brakes go on.

 

[cvkit17]

That black thing is a diode. It controls the flow of electrons so it doesn't go back. I would say without the diode there'll be a short circuit everytime your brakes go on.

LED is a diode too Light emitting diode haha

cabut !

 

[stupidcar]

LED is a diode too Light emitting diode haha

cabut !

Yeah. What diode dei.

 

[Izso]

LED is a diode too Light emitting diode haha

cabut !

Yeah. What diode dei.

I don't think LEDs restrict the flow of electrons. They just emit light as a side effect. I don't know what you call the black diode, the line around the top indicates the direction of the electron flow. That's about all I know. :ahhhhh: