Questions tagged [led]
An LED, a light emitting diode, is a light source often used as an indicator.
92
questions with no upvoted or accepted answers
3
votes
0
answers
727
views
LED strip PWM on GPIO18 + mono audio output
On the RPi 3 I would like to control a WS2811 LED strip with PWM (GPIO18) by keeping the audio working.
It looks like for the RPi Zero (I'm unsure for RPI 3 though) left and right channels of the ...
- 131
2
votes
0
answers
50
views
How can I get my python program that uses the requests library to run on boot via the crontab
I am working on creating a python script to retrieve data from a server using the requests library, and then display it on an adafruit led matrix using a raspberry pi. I have a program that functions ...
- 31
2
votes
1
answer
113
views
Traffic Light Led Change During NOAA Satellite Script?
I have the following script that downloads and processes NOAA satellites. I'd really like some external LEDs to indicate the following;
When the script is running, turn or blink red
When the script ...
- 21
2
votes
0
answers
224
views
Malfunctioning Raspberry pi 4, red and green led on all the time
My Raspberry Pi 4 won't boot anymore, there is no picture on the monitor, and both LEDS (red, green) are on all the time, they do not blink. I formatted the SD card with SD Card Formatter and ...
- 21
2
votes
0
answers
67
views
How do I power an IR LED signal that is 50 feet away?
I'm building an IR blaster with an LED that will be wired 50 feet away from the circuit. I'm going to use this 18 gauge wire to extend the LED connection.
I'm using a GPIO pin connected to a BC547b ...
- 121
2
votes
0
answers
439
views
Need help with Controlling WS2812B LEDS
I have made a 5 x 5 WS2812B RGB LED matrix to work with my raspberry pi.
I'm trying to figure out how to run several tests from this tutorial:
https://tutorials-raspberrypi.com/connect-control-...
- 51
2
votes
2
answers
462
views
Issue running LED matrix with Fadecandy controllers in Processing
I have built an LED matrix using 2048 ws2812b leds. It is being controlled with 4 fadecandies and a processing sketch. I have it running fine on my laptop, but when I try to run the same sketch on ...
- 21
2
votes
1
answer
465
views
Error when sending second start command to Cylon.js to blink LED
Using Node.js, express and cylon.js, I'm getting a post request and blinking an LED using a raspberry Pi. I receive the first post request fine, the code runs and the LED blinks. However on the second ...
- 121
2
votes
0
answers
173
views
SenseHat; Random Pattern using FrameBuffer: No Error?
This Raspberry Pi Post talking about the SenseHat gives the following example to fill up the LED matrix with random colours:
cat /dev/urandom > /dev/fb1
This works: but also generates the ...
- 569
2
votes
0
answers
430
views
Led - Manual control of WS2801 chip
I'm wondering if there's a way to manually control a multicolour LED strip powered by a WS2801 chip, i.e. being able to type a bash command from raspbian or any kind of software control, something of ...
- 121
2
votes
1
answer
2k
views
controlling rgb led strip via spi and node js
I recently purchased a pi and a string of individually addressable rgb led lights from shenhzen kapata (actually amazon, but they're the ones who sell it) and I'm trying to control it with my ...
- 121
2
votes
0
answers
2k
views
Unable to control 5V LED strips
Using this addressable LED strip:
WS2801 Led Full Color character string matrix screen point source 12mm 5V
WS2801 IC Chip, Addressable Color, need for controller.
Identify IC every led light,
Red- ...
- 685
1
vote
1
answer
42
views
Using MAX7219 Dot Matrix module with Luma.Led on different GPIOs
I have a MAX7219 dot matrix module (this one) that I'm trying to run on my Raspberry Pi 4 with the Luma.LED library. Its documentation suggests the following GPIOs/pins be used:
Board Pin
Name
...
- 11
1
vote
0
answers
63
views
RPi 3B not booting, only a stable red light
As I said in the title, my RPi 3B just wont boot and has a stable red light.
I have tried the following:
Re-flashing using balena etcher and raspberry pi OS flasher
Using multiple different power ...
1
vote
0
answers
90
views
Problems addressing WS2812B LED Strip with Raspberry Pi 3 A+
Hello!
I am currently having issues addressing my WS2812B LED-strip correctly with my RPi 3 A+. I have followed the following video guide:
https://forum.core-electronics.com.au/t/problems-addresing-...
1
vote
0
answers
33
views
I2C 1 light at a time`
i am currently using the NCP5623 (I2C LED Driver) to light up my 5V 1A (as written on the box) RGB LED strip.
i followed the sample connection as shown on the datasheet of the NCP5623 and when i ran ...
- 11
1
vote
1
answer
61
views
Obtaining a constant audio signal independent to volume
Sorry if this is a silly question but Is there a way to have an independent gain audio signal from a Raspberry Pi that does not vary with the software volume control?
I am trying to get a constant ...
- 11
1
vote
2
answers
781
views
Controlling WS2812b LED strip produces inconsistent and uncontrollable output
Background
I'm trying to control a single WS2812b LED strip from a Raspberry Pi. I've followed this tutorial from raspberrypi.com (with the exception of Prep & Installation step 4, because I ...
- 131
1
vote
0
answers
88
views
Rasberry Pi 4 LED.off() will not turn led off in a function
I have a simple circuit connected to my Raspberry Pi 4 with 3 push buttons and an LED. The buttons are connected to gpio2(pin 3), gpio17(pin 11), and gpio16(pin36), with the LED connected to gpio25(...
- 29
1
vote
0
answers
215
views
How to use Rpi SPI MCP3008 ADC to read visual light LED's transmit and receive signals?
EDIT: Firstly I wrote it a bit confusing way. So let me summarize my problem. This is something like answer to comment bellow.
(1) I am trying to make somethin like visible light communication based ...
- 11
1
vote
0
answers
153
views
WS2812B individual addressable lights too slow
I have an rpi-0-w that I use to control WS2812B strip (300 LEDs). With one strip everything is fine, but when I connect 2 more strips, obviously, update speed drops.
Is there a way to increase the ...
1
vote
0
answers
145
views
NeoPixel library slow with large number of WS2812B LEDs (Raspi3)
Noob here, I am currently working with a 10m long strip of 144LED/m density LEDs. The problem is with such a high number of LEDs loops (like a color wipe for example or filling LEDs one after another) ...
- 11
1
vote
0
answers
136
views
How would I go about writing a program(python) to mimic the use of an AND Gate using Raspberry Pi
How I set up my breadboard:
Placed SN74LS08N (AND gate) on a breadboard.
Connected IC pin 7 to GND and IC pin 14 to 5 V for IC to get powered.
Connected GPIO pin 16 to IC pin 13,
Connected GPIO pin ...
- 11
1
vote
0
answers
62
views
LED Strip on Raspberry Pi Check if its On - Neopixel
How can I check if the one pixel is on or not?
Is there any function for that. I've googled but couldn't find anything helpful.
import board
import neopixel
pixels = neopixel.NeoPixel(board.D18, 17)
...
- 121
1
vote
0
answers
2k
views
A PWM object already exists for this GPIO channel
I have a bit of a dilemma. I am currently using BCM GPIO 14, 15 and 18 to control an RGB status LED using PWM. I have configured my raspberry pi 3 to pull down pin 14 (red) on boot, to indicate the ...
- 131
1
vote
0
answers
436
views
How to get maximum GPIO output speed in Kernel module?
I'm writing a Linux kernel module on RPi2 to push an array to RGB Led matrix, so I want to have maximum speed of GPIO to reduce the 'flick' when it run Bit Angle Modulation. According to this site, ...
- 11
1
vote
0
answers
589
views
GPIO in /sys/class/leds/
I am doing a project with Raspberry Pi and OpenWrt. I need to attach indicator LEDs. Basically, I need to modify the DTS for bcm2710 and add additional GPIOs in the led section such that it gets ...
- 11
1
vote
0
answers
186
views
Raspberry Pi 3 B+ LED Light Blink not working
I am trying to get my LED to blink once, but it is not working. I connected the brown wire to pin 6 (Ground), and the red to pin 7 (GPIO 4). I watched a tutorial on connecting the circuit but it is ...
- 111
1
vote
0
answers
492
views
MAX7219 7-segment via SPI not working
I am following these instructions to get a simple 7-segment display working:
https://github.com/rm-hull/luma.led_matrix
My problem is that as soon as one of the 3 SPI Pins are connected the digits ...
- 829
1
vote
0
answers
756
views
Ethernet Indicator led on pi 3B+ not glowing
I am a newbie to Raspberry Pi and recently bought Raspberry pi 3 B+.
I first downloaded and burn the minibian on sd card as some course suggested minibian.
But whenever I connect pi with power, only ...
- 41
1
vote
0
answers
296
views
Cannot lighten up 12V LED strip with Raspberry pi 3
Bought a
12V 5M RGB LED Strip
a 12V 5A power supply
6 IRLZ44N mosfets.
i am trying to light up the led strip with PiGPIO.
followed the https://dordnung.de/raspberrypi-ledstrip/ tutorial. and the led ...
- 11
1
vote
0
answers
767
views
Red camera LED fails to turn off
I am using Raspbian 4.9.35-v7+ (3B+) and the camera: https://www.adafruit.com/product/1567.
This may be flagged as a duplicate to previous questions under similar titles; however, none of their ...
- 111
1
vote
0
answers
661
views
Hardware setup for LED with external power supply
I am looking for help to use a raspberry pi 3 as a multiple LED switcher.
The setup should be:
6 LEDs at 3W, 9.6V and 300mA (each!)
a external power supply for the LEDs
a breadboard to put everything ...
- 111
1
vote
0
answers
200
views
WiringPi can only turn on 8 LEDs
On my RPi 3 I have a PHP website to control 10 LEDs. Each is wired to a separate GPIO pin and 220 ohm resistor.
Here is the code:
<html>
<head>
<title>LED Control</title>...
- 121
1
vote
0
answers
25
views
Lighting Issue On Snapshots
I'm creating a proof of concept project for my Pi 3. The concept is to take a photo using a USB webcam when a button is pressed. That part was simple using OpenCV. However, the lighting is fairly ...
- 11
1
vote
1
answer
356
views
Button isn't triggering in python script
Software guy here, first time doing hardware.
Here is my breadboard setup (yellow is GPIO-8, green is ground):
Here is my Python:
import RPi.GPIO as GPIO
from time import sleep
GPIO.setmode(GPIO....
- 125
1
vote
0
answers
2k
views
How can I get my raspberry pi 3 to work with SK6812 LEDs without a screen?
I have a raspberry pi 3 and am trying to get it to run the SK6812 LEDs with no screen. When I have my ASUS monitor connected, the LEDs work fine, and when I disconnect the screen and reboot, the LEDs ...
- 11
1
vote
1
answer
536
views
Can I control 5050 RGB Strips with the Raspberry pi?
I have purchased 5 meters of a 5050 RGB Strip yesterday. I bought it for my PC case, but of course I don't want to use 5 meters in my case.
I want to do some smart lighting in my room and a bias ...
- 164
1
vote
0
answers
137
views
After power on Rpi3 RED led steady but green continuously blinking. what could be the problem?
i brought new Rpi3 and boot 16gb card with 2017-03-02-raspbian-jessie when power on red led steady and green blinking is there any problem in booting process of pi? HDMI not showing anything neither ...
- 11
1
vote
0
answers
361
views
Problem with SoftPwm from Microsoft.IoT.Devices.Pwm
I'm new here, started working with RPI and Windows Core month ago.
Currently I'am trying to control RGB Led Strip ( set light, turn on/off, dim) from RPI.
To achieve this I use RPI 2 model B V1.1, ...
- 111
1
vote
2
answers
354
views
7 color flash sensor does not blink
I have a raspberry pi 2 Model B v1.1 and 7 color flash sensor. I want to flash the led to get my hand into practice. This is my first program with raspberry pi and unfortunately i failed to flash the ...
- 111
1
vote
0
answers
47
views
House switches light the RPI led strip
I'm having an issue with my LPD8806 led strip.
My RPI and led strip are both located inside a lamp, both being powered by a multi output source (not the best one). Before this I was powering the led ...
- 111
1
vote
0
answers
2k
views
Green LED never lights up
When I power up my Raspberry Pi 3, the red LED lights up and stays red until I unplug it. The green LED always stays off no matter what:
- I tried 3 different 2A chargers
- I tried 2 different SD ...
- 111
1
vote
0
answers
316
views
Blinking LED - start and stop
This is my first post here so HELLO and sorry if I'm posting in the wrong place.
Do you know a simple bit of Python that will set a LED blinking indefinitely until it's told to stop?
Control will be ...
- 11
1
vote
0
answers
205
views
Synchronize Pi Camera and LEDs
I have a Pi Camera (NoIR) and two sets of LEDs, A and B. The two sets of LED are different in position and wavelength.
I want record video with the Pi Camera so that any consecutive frames be lit by ...
- 111
1
vote
0
answers
435
views
How can I set up a chain of these RGB Smart Neopixel LEDs?
I have these LEDs with me. At the end of the day, I need to connect around 100 of these together, with each one being individually programmable.
I was testing connected the four of them I have ...
- 11
1
vote
0
answers
242
views
Why wont my LEDs display when Brightness is turned down using Hzellers library?
I have 4 16x32 Led matrixs chained to display output from my Raspberry pi using Hzellers led matrix library. Link: https://github.com/hzeller/rpi-rgb-led-matrix. I want it to display at 25 percent ...
- 11
1
vote
0
answers
327
views
Increase Performance of 4x4 LED Matrix (Multiplexing with pi4j)
I have coded a Display-Class to drive a X by Y LED-Multiplexing-Matrix with pi4j. However, I when driving a 4-by-4-Matrix I cannot get the framerate beyond roughly 30 fps, which still produces a ...
- 111
1
vote
0
answers
59
views
Half size breadboard problem
I purchased the Raspberry Pi YouTube Workshop Kit from Buy a Pi.com a few days ago. I have a B+. But when I completed tutorial number two, LEDs On and Off, only the LED on the right turned on. Then I ...
- 123
1
vote
0
answers
443
views
Spi and WS2801 problem on the raspberry pi
I have bought a couple of these led strands from adafruit.
http://www.adafruit.com/products/322
they use WS2801 chips.
I have a raspberry pi B+ running raspbian
I have been having problems ...
- 21