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Questions tagged [led]

A light-emitting diode (LED) is a semiconductor light source. LEDs are used as indicator lamps in many devices.

A light-emitting diode (LED) is a semiconductor light source. LEDs are used as indicator lamps in many devices, like mobile phones or micro-controller boards.

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How to keep screen from turning off when my flaslight app running?

Currently i am working on my first android project. When screen off led light also off any help guys.
Usman Jamil
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PIC Assembly programming - LEDs with potentiometer

I'm completely new to Assembly programming, but unfortunately I must solve a task in a short time using Assembly and PIC16F887. My task is to move a flashing light on a row of 4 LEDs with a potentiometer. The frequency of the flashing light should…
Wolf
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Arduino, button delay LED output

So I am trying to have an LED react to a button. The problem I seem to be having is how to add a delay in between the button click and the led reacting. Essentially I want to, for example, click the button 3 times and then 2 seconds later have the…
BeamerEA
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Led Strip via USB?

Is there a way to attach a LED strip to a usb cable, so i can power it with my pc? The LED strip got the following connections: red blue green power(about 5V)
SmokedMeat
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Arduino RGB LED random PWM Level

I am attempting to create a program that will randomly choose a PWM value for a RGB LED from a given Array. It works fine with the first color, blue. Bu then I nest in a second color, green, I loose the blue from displaying and only the green…
Nicholas Rice
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Camera flash not working

My application turn on/off flash on a lot of devices. But it's not working on LG-F500S Android verion 6.0 (Samsung S7 android 6.0 work fine). Who help me to find reason and solution, please?
Tran Hien Le
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How to control Brightness of a LED using c in RL78 Micro Controller?

As i am using a RL78 micro controller , i need a C code for controlling the brightness of a led.i have searched in the internet ,but of no use.... only some datasheets are provided.There is no exact calculation of duty cycle for PWM also,if anyone…
user3749242
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Understanding the logic behind the code for controlling an 8x8 dot matrix with a joystick

I found this code online for controlling a max7219 8x8 matrix with an Arduino, and I am struggling to understand a few things about the code. Here is the whole code: #include int UD = 0; int LR = 0; //Setting up…
Crispy Bagpipes
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LED wont turn on using localtime [ARDUINO]

#include #include time_t now; struct tm *now_tm; int h,m,s; void setup(){ pinMode(D6,OUTPUT); } void loop () { now = time(NULL); now_tm = localtime(&now); h = now_tm->tm_hour; m = now_tm->tm_min; s…
Joseph St.
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How to check if a led is blinking during a period of time?

I need to check if a LED is blinking every 2 seconds...is it possible? I am using Arduino Mega 2560. Thank you.
Claude Hitech
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using processing for 3D image mapping

actually, I've tried to run the spherical POV. For run POV, each image should be converted to the number of lines which is used in each revolution, I've tried to use processing software to convert the 2d to 3d image by its library, but when insert…
Hamid s k
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error expected unqualified-id before numeric constant help me

This is my code to use a button: int estado = 0 void setup(){ pinMode(8, INPUT); pinMode(4, OUTPUT) } void loop(){ estado = digitalRead(8); if(estado == HIGH){ digitalWrite(4, HIGH); } else { digitalWrite(4, LOW); } }
user3814611
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LED illumination in iOS 6

Can anyone show me an example of how to use the following method: (BOOL)setTorchModeOnWithLevel:(float)torchLevel error:(NSError **)outError
thokthak
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