Questions tagged [led]
An LED, a light emitting diode, is a light source often used as an indicator.
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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 ...
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How to control 12V LED with the GPIO?
Heyo!
How to control single 12V LED using Raspberry's GPIO?
To be more exact, I need to connect 12V LED & push button to Raspberry Pi 3 B+ GPIO in order to control LED (on/off) and read button ...
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anode RGB LED to raspberry Pi
I have wired up a common anode rgb led to my raspberry Pi. I dont understand why its not lighting up. My setup is this:
5v to rgb anode
rgb to pi pins ( 5,6,26)
My code is
const Gpio = require('...
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Why do LED lights need resistors? [duplicate]
Can someone explain why LED lights need resistors when connecting to pi. The raspberry Pi is either providing 3.3v or 5v depending on if it's connected to power pins or gpio pins. Your set up would ...
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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 ...
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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 ...
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Need RPi3b voice control
I'm failing to find a simple way to control my RPi via microphone. I've fount some projects but they all require things such as Google AIY voice kit. Is there any simple way for me to control GPIO ...
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Why is my code not working between time hours?And what should be done if im using PIR sensor ,what is the change that should be done in this code [closed]
import RPi.GPIO as GPIO
import time
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BOARD)
GPIO.setup(3,GPIO.OUT) #Define pin 3 as an output pin
while True:
if(time.hour(18)&&time.hour(5)) #...
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Raspberry Pi 3 won't boot, red LED light only
I was using my RPi for testing the sensors of my project, when suddenly it stopped and won't boot after that. I did not touch anything nor destroyed parts of the pi. The sd card is working fine as it ...
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Writing two different hex values to linked shift registers
I'm new to raspberry pi and electronics, and I'm working on improving my first (meaning my design, no tutorials) project. My original project was two seven-segment displays linked to two shift ...
user97077
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Neopixel lights do not change color
I recently bought a 1 meter WS2812B strip. I installed the Adafruit Neopixel Circuit python library with the following commands:
sudo pip3 install --upgrade setuptools
pip3 install RPI.GPIO
pip3 ...
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Unplug ethernet seems to freeze connectivity-check script
I'm working on a raspberry project with a RPi B+, running Debian stretch. I've included a LED which should turn on when the Pi establishes an internet connection, and should turn off when this ...
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3 PWM pins for RGB LED
I got an RGB LED, one mass and one for blue, red, green. So I got a list there are only two PWM compatible pins listed. Pin 32(GPIO 12) and pin 33(GPIO 13). But for my RBG LED I need three pins with ...
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How did I manage to fry my pi 3+B? Can I recover it?
I'm new to Raspberry pi and electronics in general. All worked fine (a node webserver, reading a DHT22 sensor) then I tried this tutorial - https://www.raspberrypi.org/magpi/breadboard-tutorial/. It ...
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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 ...
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RP 3b - green led flashes 4 times [duplicate]
I tested one SD card on 2 different RPis and I get the same pattern: no boot, green led blinks continuously on a 4-blink pattern. This would point to a problem with the SD card but I tried reading the ...
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Powering common anode project from GPIO output instead of 3.3V
Instead of doing PWM on each "return pin" as it can be seen in Schematic diagram A, my idea is to use only one PWM for powering the circuit from GPIO4 (PWM) as it is drawn in circuit B. Is it (diagram ...
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My Raspberry Pi B+ has the Ri 2 B pinmap
I trying out different java programs for my RPi B+ V1.2 and as far I have only tried to blink with a lamp for a few seconds. It works.
Now I want to try to blink with a lamp by using a button. In ...
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LED pwm fading is flickering
This is how I'm fading some LEDs using a logarithmic function. But with that the LEDs are flickering somehow. I don't understand why...
import time
import math
import RPi.GPIO as GPIO
GPIO.setmode(...
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Red led repeatedly blinks 4 short and 4 long on RPi 3B+ with TinyCore
The red led repeatedly blinks 4 long 4 short and the Pi doesn't boot.
Tested with various power adapters.
When powered up without an SD card the red led is solid.
I'm using an SD card that works fine ...
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How to properly implement threading within a function toggled by a button [closed]
I need a little help if possible.
I'm trying to make a threaded function which will make my LEDs blink randomly as long as the button is pushed. when it is released it should exit the function and ...
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GPIO Pins Stay Active
On my Raspberry Pi B+ I have a standard program to blink a LED. I run it using the terminal command python blinky.py, and when I do, the LED lights up, but does not blink, as it should. I then cancel ...
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IR LED range and angle
So my goal is to operate my TCL Roku TV with my Raspi.
I'm using these LEDs: AIRSUNNY three Legs 5 pairs Infrared Diode LED IR Emission and Receiver and my setup is pretty much identical to this: ...
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Can't blink a LED using SPI interface on Raspberry Pi v3
As a part of my PoC project, I'm using single 5050 LED made by Adafruit. I wired it like this (LED - RPi):
DI (Data Input) - SPI0 MOSI
CI (Clock Input) - SPI0 SCLK
GND (Ground) - GND
VCC (5V) - 5V ...
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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 ...
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Raspberry Pi Zero W not responding
I bought it about a year ago and a few days ago I plugged it into my Mac with a micro USB. I did make the mistake of plugging into the USB port initially but it did respond.
For a while it worked i:e ...
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RasberryPi Zero W LED does not turn ON
I am new to Rasberry Pi and trying to turn on an LED .
I am using PIN BCM 18 as output and using a Python code to run it. Tried both methods using GPIO and gpiozero. But do not see any output. I have ...
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How to generate a hardware PWM wave for driving an LED through RPIO?
I've looked through the documentation of RPIO, and used GPIO18 to get my PWM up and running.
This is my code:
from RPIO import PWM
servo = PWM.Servo()
servo.set_servo(18, 4000)
As explained in the ...
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IR LED attachments on the RPi NoIR v2
So I bought parts I didn't know would not fit together. Namely, the Pi NoIR v2 Camera,
and IR LED module(s).
I figured those two combined would be somewhat like the other 5mp IR Cameras on Amazon. It ...
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Controlling 12 RGB LEDs (with adjustable colour mix), with long cable runs
I need some advise on this -- driving 12 RGB leds individually. I was thinking of this model: LL-509RGBC2E-006. If I use these "plain" RGB LEDs with 4 pins, so that would mean I need to set 12 x 3 = ...
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RPi stopped booting, only red LED, different rpi/sd/power supply do not work
Problem: I have a working sd card, a working rpi, and working power supply. When I then plug in an ethernet cable into the rpi and reconnect the power supply to a power bar (where I have 3 other rpi's ...
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Noise in the GPIO when output is high or low
I just set up my pi to run Homebridge allowing it to control an LED strip over GPIO pins, it all works well except the LED lights flicker with radio interference. This interference is very noticeable ...
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IRF530, can I put LED+resistor on input?
Can someone tell me if the following circuit is sane? It's a fairly standard lowside switch, but I've added an LED plus resistor. V_GS on an IRF530 is about 2v, so I assume that a small LED won't lead ...
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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 ...
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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 ...
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Raspberry Pi LED Not Turning On With Button
So, I am trying to use the raspberry pi model 2b with Debian to control a LED light using a button. But, when I run the python script (made with python2 btw), it brings up no errors, but instead when ...
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Difference in using an LED with gpiozero vs. RPi.GPIO
I'm trying to turn on an LED and it was trivial with the gpiozero library. The following works just as expected.
# Version 1 (working)
import gpiozero
import time
led = gpiozero.LED(21)
led.on()
...
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How to turn off pin 23 correctly? SSH connection crashed
I am a newbie to the Raspberry Pi and as the title says, I was connected to my RPi through SSH protocol and the session suddenly was terminated due to a 'FlowSocketReader' error or something.
My LED ...
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DIY WS2812b LED strip
I need to make a custom individually addressed LED strip.
I could not find what I want anywhere (size and LEDs density are essential factors) - so I thought that it's best to make it from scratch.
...
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Wiring a RGB LED on to a Raspberry Pi
So I got a bunch of these LEDs and I can't seem to figure out how to wire them. This is what I'm working with.
I tried adding the gnd and 5v but it doesnt do anything. When i connect the Din to 5v ...
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Problem with LED blink program on Pi [closed]
I am completely new to RPi and stuck unexpectedly.
I am trying to create a simple python program to make my LED blink.
Here are the two programs which are giving same outputs on terminal when I ...
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Lots of LEDs in a chain
I need to control about 90 LEDs with a Raspberry Pi. I am thinking of doing with with 3 chains of 30 LEDs, so I can control each set of 30 LEDs independently (turn 30 on and off at a time) and change ...
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Led turns on immediately after connecting it to the Power pin on Expansion Header
I have a Raspberry Pi 2 model B, and whenever I connect a resistor and LED to the 5 Volt pin and the ground pin it immediately turns on without any programming to enable it. I just want to know wether ...
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Program is gets stuck when running a breathing LED program
Im trying to make an LED that breathes. This is the code I currently have. When I run it it gets to the point where it prints "breath off", then gets stuck and I have to pull the plug. It doesnt ever ...
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How can I troubleshoot why LIRC's sent signal doesn't power on devices?
I am trying to setup IR remote control with Raspberry Pi 3 Model B. OS - Raspbian stretch. The PI pins schema is like that. The LIRC setup is outdated, so I found some other manuals and combined them.
...
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Transistor Switch: Turning off Waveshare LED Boards
This is a similar question to How to turn off the CSI, and turn it back on again, but I'm actually trying to implement the suggestions that were given in that post.
I use the WaveShare RPi IR-CUT ...
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How do I debug an LED strip that isn't working?
I've scoured the forums here and elsewhere and can't exactly figure out what my next step should be. I've followed this tutorial
https://tutorials-raspberrypi.com/how-to-control-a-raspberry-pi-ws2801-...
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Noob Looking to detect LED voltage 0v LOW, 1.8v HIGH on another device
Trying to learn about the PI and I have acquired a pi Zero W with the GPIO header. I have an external device that signals activity via an LED, which blinks @ 1.8v 2X and then remains on until reset, ...
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How to check for alive process in an infinite loop and use LED as status indicator?
Clearly I'm a beginner when it comes to setting up a script. I'm trying to check if a process is alive and running, and if so, switch on an LED.
I need help with the following:
Check if a process is ...
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Connect multiple concurrent MCP23017 to Raspberry Pi
So I want to control multiple (12) RGB LEDs using the raspberry pi. I have 6 connected to the GPIO ports on the pi itself and want 6 connected to 2 MCP23017. I cannot seem to get them both to show up ...
