Questions tagged [led]

Question 1

I wanted to test my new PIR sensor but it always shows the LED high voltage. Please tell me what to do? code: const int pirPin = 2; // пин pir датчика const int ledPin = 13; // пин диода или ...

Question 2

Not sure if this belongs more in an electronics SE, but I'll give this a try. I'm trying to use an ESP32-C3 and an NPN transistor (2N5551) to PWM drive an LED (values below). I'm trying a simple fade, ...

Question 3

The code below has a normal bright led on the 5th pin of port F while those on port B, 0, 1, 2 are dimmer. Even if you hold down one button and a moment later simultaneously press another button while ...

Question 4

Hi, I am using p10 Led display and trying to make digital clock. it works fine but after 2 or more weeks later without any switch off there is a overlaying start on characters. why this happening I ...

Question 5

I want to show progress on a wall using LEDs from data added in an Excel speed sheet. I want to have about 20 different LEDs maybe more. Can this be done with an Arduino Uno?

Question 6

The brightness of the LED gets higher normally but when it gets to full brightness it just stays like that - it doesn't dim. Sorry if this has already been answered I just can't seem to find anything ...

Question 7

In the code below which is running on a WEMOS D1 (ESP8266), a NeoPixel strip turns on 1 LED in red which moves left to right and then right to left whilst the board attempts to connect to Wi-Fi in the ...

Question 8

I connected a led to pin 7 (with a small resistance to avoid burning it) and tried the code below, with and without pinMode as output void setup() { pinMode(7, OUTPUT); Serial.begin(9600); } void ...

Question 9

I have two UV leds, one Vf 3.3V @ 150 mA and the second one Vf 5V @ 150 mA. I need a circuit to make them fade in and out alternatively, i.e., as one goes dimmer the other goes brighter and vice versa....

Question 10

I have an Arduino project to control a motor's speed at 3 levels, indicated by 3 LEDs, so level 1 is speed 1 and LED 1, and so on for levels 2/3. Also, I added a low-battery voltage indicator to ...

Question 11

When I connect the Arduino to the computer, the L LED is constantly on and com is not detected. However, when I press the reset button, the L LED starts blinking for about 10 seconds and com appears. ...

Question 12

I am trying to blink a Grove - RGB LED Stick (10 - WS2813 Mini 3535) with this code: #include "FastLED.h" int ledState = LOW; // ledState used to set the LED long previousMillis = 0; ...

Question 13

I'm using a DF Mini Player with my Arduino Uno project I keep getting stuck on the same point - how to trigger my LED sequence. I discovered, through some google searching, that utilizing the BUSY ...

Question 14

I need to add support for the UNO R4 (both models) for a library I'm maintaining. The library uses the LED on pin 13 as status indicator. I can't find any information whether that LED is still there ...

Question 15

I have been using https://wokwi.com/ to learn Arduino and I am having a problem that seems to be happening no matter what I do. I am trying to set up a push button and an LED. The end goal here is to ...

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Questions tagged [led]

PIR sensor gives high voltage [closed]

ESP32 LED PWM fade not working?

The same code in succesive order with different results, bright onboard led vs dim of the same led, Arduino Nano Every

P10 LED Display Character Overlaying with DMD library

Using Excel to communicate to an Arduino to light 20 LEDs

LED will fade in but not fade out

strip.clear() is not clearing/turning off the NeoPixel strip after resetting the ESP8266

Same LED but different brightness on same PIN

Make two LEDs fade in and out with with different PWM values

Just one more pin!

L LED on Arduino is constantly on and com is not detected

blink a Grove - RGB LED Stick

How to use a DF Mini Player Busy Pin to start an LED Sequence?

Does the UNO R4 still have the standard on-board led on pin 13?

Push button issues

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