Hi. I have an Arduino R3 with a power jack input.
I want to make an ambilight system.
Can I power the Arduino with a charger to the jack input and connect the LED strip directly to the board? Or do I have to power the LED strip separately?
Welcome to the forum
What is the maximum current that the LED strip could draw ?
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The LED strip is ws2812b IP65
60Leds/M 18 v/ meter
i need 2.5 meters
the charger i want use is output:12V -0.5A
- A single WS2812 LED can consume 50mA at full brightness
- Your strip has 2.5 x 60 LEDS, giving a total of 150 LEDs
- The current consumption of 150 LEDs could be as high as 50 x 150mA, ie 7,500 mA or 7.5 amps
Can you see a possible problem ?
I need a charger of 7 amps?
You need more than 7.5A power supply if you want to drive the LEDs at max brightness.
Which is up to you (your code).
So a 12v 10a power supply would be enough? Is it necessary to put any resistor on the Arduino?
Ws2812b LEDs are usually powered from 5V power supply.
Can you post some link/datasheet of your strip.
If they really are Ws2812b LEDs, 5V10A power supply would be correct choice to drive them all at max power.
If they are 5v. Thanks!
A 330 ohm resistor from the Arduino data pin to the DIN pin of the WS2812, and a 1000uF, electrolytic capacitor across 5V and GND.
The problem is that there is a voltage regulator on the Uno that converts the 12V to 5V. It has virtually no heat sink so is limited in its current capabilities (maybe 300 mA).
I do not know if there are 5V/10A wall warts (or similar). I would use something like LRS-50-5 - POWER SUPPLY ENCL. I=220 O=5V 10A 50W.
If you set the BRIGHTNESS in FastLED object or setBrightness(); of the Adafruit_Neopixel object, to 127 (half bright, half of 255) you will only need half the current... so rather than 7.5A, maybe 3.3A. These are plenty-bright at night.
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