Saturday, August 8, 2015

How to make LED board (method 2)

This is second method for making LED board. in first method i used breadboard for making a small LED board but since there aren't big breadboard in markets so that method not suitable for big size projects.
In following video you can see how can make a LED board using aluminum plate.
The aluminum plate with 0.7 mm thickness must puncture with 4.8 or 4.9 mm drill bit.(for 5mm LEDs)
The LEDs must connect together in parallel means all positive connect together and all negative connect together so you can run that with 2 to 3.5v (according to led types).
you have to using a resistor through positive line to protect your LEDs and increase its life period.(see the note)

Parts list:
Aluminum plate 0.7 mm thickness
Drill bit 4.8 or 4.9 mm (for 5mm LED)
Silicone adhesive
Black color spray
Text or shape printed on a paper
Solder flux
LED(number of LEDs depend on your text or shape bigness)
Resistor (see the note)

How to make LED board

Protection resistor used when supply power is more than standard LEDs voltage, its value depends on number of LEDs, LEDs type(color) and voltage of battery or power supply. 
You have to using ohm's law for calculation the value of necessary resistor.
In first run your LED board by 2 to 3v battery and use a DC Ammeter to measure the current consumption, 
How to make LED board (method 2)
How to make LED board (method 2)

then put that current value in the ohm's law equation with voltage that you want(for example 12v if you want to run your LED board by car battery)
Now you can find the value of resistor as follows :

R= (Vs-Vf) / If

Vs is voltage(volt) of battery or power supply, 
Vf is voltage needed to running the LEDs
If is the current consumption of LED board(Amp)
R is protection resistor that you need(ohm)

R= (12-3) / 0.231
R= 38.96 ohm

Power of the resistor:

P= (Vs-Vf) * If 
P= (12-2.5) * 0.231
P= 2.1 W

So i have to use 40 ohm 2W resistor for 12v battery.

This is only an example, your LED board maybe need to other resistor value.

You can connect each 5 LEDs (or 4 LEDs for white or blue color) together in SERIES if you want to running the LEDs by 12v, in this case you don't need to resistor to protection because the LEDs voltage will be suitable to battery voltage as you can see in following figure.

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