A LED is a light emitting diode. Lighting a LED is considered the "Hello world" of a circuit design, and it can be as simple as putting a series resistor or can get more complicated, involving PWM and multiplexing.
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0answers
41 views
Higher current LED driver for persistence of vision display
Project needs
We need an inexpensive LED driver IC that:
Can source or sink at least 15mA/LED
Has an SPI-like interface (not I2C)
Has a separate latch pin
Has at least 256 grayscale intensities
...
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3answers
65 views
Higher resistance resistor in place of higher wattage?
Engineering newbie here. I'm fairly sure I already know the answer to the question, but I figure I'll ask anyway.
I've got an LED lying around, that according to an LED calculator requires a 80R 1/2w ...
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0answers
28 views
Connecting Samsung LED Digital Audio Out to Creative 4.1 speakers [closed]
I have currently a Samsung - UA40D5900VR LED TV which i need to connect my Creative Cambridge 4.1 computer speaker
My TV has only Digital Audio OUT (optical) whereas my speaker has 3.5 mm male ...
4
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1answer
115 views
How does this LED setup work?
I noticed this LED setup in a datasheet for the Kingbright SA40-19EWA. Instead of the leds being in a simple series or parallel setup, each segment of the display has four sets of two leds in ...
2
votes
0answers
101 views
Make an LED Ring Light Up Smoothly?
I am working on a project that would look really cool if I was able to put a ring of LEDs (kind of like the one on the TRON Identity Discs) light up smoothly in a circle, rather than have sections of ...
2
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5answers
805 views
How do I control several hundred individual leds with Arduino(s)?
I am working on an electronics project which involves hundreds of LEDs. (Talking upwards of six to seven hundred LEDs...a lot, I know.) Is there any way to control this many LEDs with one or a couple ...
0
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1answer
49 views
Shifting between PWM options
I'm using a Freescale MC9S08DZ60 microcontroller, and Ive written the code for applying PWM on a specific pin.'This is an attempt for Breathing Effect of LED, a question i had already asked - LED ...
2
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2answers
100 views
Energy-efficient LED driver circuit
I want to light a normal LED for as long as possible on two AA or AAA batteries. It does not have to blink or so, just stay on. The LED doesn't have to light at the max, as long as it's visible from ...
2
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2answers
33 views
Simulate a bouncing ball on a LED cube
I just finished working on my 4x4x4 LED cube. I am trying to write an animation for a bouncing ball in the cube. Basically, a ball either 1 LED big, or 2x2 LEDs big should be moving around within the ...
8
votes
4answers
30 views
How should I light up all the LEDs?
I am working on a 4x4x4 LED cube. I have connected all the negative terminals of LEDs in a horizontal layer to each other, and am using one Arduino pin per layer. I have connected all the LED positive ...
1
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1answer
52 views
What value resistors should I use for this LED?
I'm trying to figure out the actual value resistance I need for the RGB LED I bought from here: http://www.adafruit.com/products/314#Description
According to most of the online calculators, for the ...
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2answers
220 views
Help verify 8x8x8 LED cube circuit
I am a beginning hobbyist when it comes to electronics. I have read lots of theory but I only have a little bit of hands on experience. I would like to build an 8x8x8 LED cube and I came up with this ...
22
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7answers
5k views
Why does a resistor need to be on the anode of an LED?
Please be kind, I am an electronics nub. This is in reference to getting an LED to emit photons.
From what I read (Getting Started in Electronics - Forrest Mims III and Make: Electronics) electrons ...
2
votes
2answers
90 views
How can I control 8 LEDs with a timing delay with only one microcontroller (PIC12) written in Assembly?
I can have 5 I/O pins enabled. I'm just confused on how to control them individually.
0
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0answers
69 views
Source and sink driver ICs for LED matrix display
I am building a led matrix display (16 cols x 8 rows) using 1/16 duty cycle for multiplexing the display. As per my understanding LED requires 20 ma forward current when drive directly and it will ...
