All Questions
Tagged with led power-supply
18 questions
0
votes
1
answer
28
views
Video glitching and gpio pin problems. Faulty Pi or low voltage?
I have 12 externally powered neopixels connected to one of the gpio pins of my RPi3B+ which in turn is powered by a (supposedly) 2.5A power supply and hooked up to a small 1024x600 LCD display (...
- 101
2
votes
4
answers
962
views
Controlling and Powering 12v LEDs
Disclaimer: this is my first PI project, and at the moment I have only a basic knowledge of circuitry, so please be gentle.
I'm looking to construct a device using a PI 3B+ that'll be housed outdoors ...
- 123
0
votes
1
answer
174
views
Power consumption of APA102C LEDs when turned off? (Pimoroni Blinkt!)
I have the Blinkt! Module for my Raspberry Pi (https://shop.pimoroni.com/products/blinkt) which from what I can tell features 8 APA102C LEDs (Datasheet: https://cpldcpu.files.wordpress.com/2014/08/apa-...
- 1
0
votes
2
answers
2k
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Red Led flashing
I have a PI 4, WHEN using a 3.5A USB power measured 5.1v supply, the red LED is constantly on. When using a power supply which was rescued from a DVD player, checked supply 5.1v I get a flashing red ...
- 7
3
votes
1
answer
171
views
How to power on multiple LED through 3.3V rail ? (Power supply problem)
I'm trying to use the 3.3V rail to power up 10 LED (20mA/LED).
I read that the raspberryPi could supply until 1A through this 3.3V rail, that's a lot more than needed when all the LEDs are powered on....
- 33
1
vote
0
answers
711
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
2
votes
3
answers
4k
views
How many MAX7219 8x8 can a Raspberry Pi 3 power?
I'm trying to figure out how many MAX7219 8x8 LED matrix can a Raspberry Pi 3 handle without the need of external power.
I would like to connect an array of 8 but I suspect I'll need an external ...
- 173
4
votes
1
answer
1k
views
Powering WS2812B LED strip from Pi brownouts
I have a Raspberry Pi 3 Model B currently controlling and powering a strip of WS2812B LED's. A separate 5V 15A power supply powers the Pi through pins 2 and 6, while the LED's are powered off of pins ...
- 143
4
votes
1
answer
6k
views
Control 5m of WS2812 LED Strip: Wire it up
I want to control 5m of WS2812 LED Strip with my Raspberry Pi, which will be placed around two Ikea Billy shelves. I read some articles and tutorials regarding this topic:
http://popoklopsi.github....
- 45
0
votes
2
answers
5k
views
Controlling a 5m WS2812 LED Strip. Which power supply?
I read the following tutorial: http://popoklopsi.github.io/RaspberryPi-LedStrip/#!/ws2812
In the tutorial 1m of WS2812 led strip is used and it is stated, that its power supply needs a maximum of 3,...
- 45
3
votes
1
answer
1k
views
Powering up a WS2812 led strip with different power supplies
I have a Pi powered with its own adapter. I bought a 1 meter ws2812 led strip and bought a separate power supply for it (5V 6A). I plan to plug the +5V of the power supply directly to the +5V section ...
- 153
2
votes
4
answers
5k
views
Red LED after `sudo halt`, may I unplug?
I flashed Raspbian and I use my Pi headless, connecting via SSH.
To power it off I do sudo halt, which disconnects me from the SSH. After a few green led blips I have steady red led on. Does it mean ...
- 121
3
votes
2
answers
3k
views
Connecting WS2801 LED strip to my Raspberry Pi
I'm new to the Raspberry Pi community and to working with electricity, so I'm looking for some advice.
I've brought the WS2801 LED strip from eBay (but I think it's the same as this: https://www....
- 133
0
votes
0
answers
589
views
Using LED strips (many!) and mutiple power sources wiring up the ground?
So I'm using LPD8806 leds with RasPi, and we are using many many lights and need multiple power sources.
With one power source, we wired the negative of the power source to a ground pin on the Pi.
...
- 101
2
votes
3
answers
2k
views
Power LED is very dim on RPi B+
if I am plugging in the power supply the red power led lights very dim.
I found several guides to test the the board with a multimeter but these were for the other revisions, and it seems like B+ is ...
- 413
1
vote
2
answers
159
views
Resistor calulation for two LED
I want to connect two IR LED to the 3.3v output on the PI in series. I need to reduce the 3.3v to 3.0v. What kind and measure should my resistor be?
I swear this is not a word problem from school......
- 131
2
votes
2
answers
145
views
Powering a RPI with its circuit from one wallsocket
I want to power a Raspberry Pi with 54 LEDs (24 white, 24 warm white, 6 RGB - probably all at 20mA or something like that) from one wall socket. I'm planning to use the Pi to control the LEDs via ...
- 23
1
vote
3
answers
9k
views
Power light but very dim act. No display or network output?
When connecting my pi via HDMI, I am getting no image. I can't see any additional devices on my network when connected via Ethernet.
LED panel has a strong red light on PWR, very dim green light on ...
- 121