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votes
1answer
56 views

Arduino random LED on

I have a project which has two options No. 1 Randomly turn on one LED from a group of 6 LED (Relay Board) No.2 randomly turn on one LED from a group of 2 LED (Relay Board) The selection of the ...
-1
votes
1answer
75 views

How come some Arduino Nano pins (D3, D4, A3, A4, A6, A7) cannot be set high?

I made a sketch to switch on all digital and analog pins, and found out several pins did not work as expected. Note: I manually put a jumper wire from each digital and analog pin (one at a time) to a ...
0
votes
1answer
37 views

Ethernet.begin() conflicts with build-in LED on Arduino Nano

I have Arduino Nano "clone" which I would like to use with Ethernet ENC28J60 shield. I have noticed that when I include/use UIPEthernet.h library, build-in LED does not work properly. I have written ...
0
votes
1answer
37 views

led chaser fill color effect

Please help. I am learning a lot about Arduino. Most all in lightning. I am a newbie. I play with nano and LED ws2812 and use fastled library. What ask is to make effect like fill effect. For ...
-1
votes
1answer
38 views

Can I power 25 LED via USB?

So I'm currently working on a project where I build a WordClock. To display the current time I use WS2812B LEDs which should be white when turned on. Only about 25 leds per time will be turned on, the ...
1
vote
2answers
66 views

Arduino Nano LED not working

I am just starting with Arduino and was trying to make the LED example work. I changed the script as follows to keep the LED on: #define LED_PIN 12 #define LED_RX_SIG LED_BUILTIN void setup() { // ...
0
votes
1answer
25 views

I am not able to set the correct configuration of sound module

I have been trying to make sound reactive LED lights but my sound module is detecting only very close voice the LED react only when I press it to the speaker with my hands I have tried to set the ...
0
votes
0answers
214 views

Programming POV Display for Arduino

I can maybe work through a php/sql and css/html method of making a website to convert an image to code, but that is currently a time consuming method (which i will be taking the challenge if doing ...
0
votes
2answers
41 views

How many Amps can a Nano Arduino hold for LED project

I'm really new at this, and here is my doubt. What if I need to light 120x WS2812B (5v)LEDs (link: LEDs) using an Arduino Nano? if it takes 60 mAh each pixel, the total amount needed should be around ...
0
votes
2answers
425 views

could not convert 'digitalWrite(8u, 1u)' from 'void' to 'bool'

I am trying to make some LED lights to turn on when i flick a switch on my RC crontroller. I will connect the signal wire from RC controller to pin 8. The plan is: if i flick the swich, the LED's (pin ...
0
votes
1answer
59 views

Help with simple gradually brighter flickering led

im a newcomer for arduino and sorry for any grammar error. So what im trying to do is replicating a flickering effect found on spacecraft thruster when they about to take off where the fire bursting ...
1
vote
1answer
441 views

Flickering LED when servo moves

I just got to play around with Arduino lately so I'm really new on this stuff and sorry for the grammar error. I got a work where I need to turn the LED on all the time, my plan is to add a slow fade ...
0
votes
1answer
67 views

How to stop extra LEDs from lighting in LED cube

So I build LED cubes and the way I have it programmed is I use an analog pin for the ground layers and set them to high when i want an led on that layer lit up. So lets say I wanted the following LEDs ...
0
votes
2answers
114 views

Fade sketch stuck in mathematical loop

I tried to edit the Fade sketch such that the max intensity the PWM reaches is controlled by a potentiometer. I used analogRead() on the potentiometer and converted the 10bit value to 8bit equivalent(...
2
votes
3answers
3k views

How to detect if LED is switched on in external circuit using Arduino NANO?

I want to detect when an LED is powered on using an Arduino NANO. The LED is part of an external circuit. The LED uses about 1.8V. Would the circuit below allow me to detect when the LED is switched ...
5
votes
1answer
1k views

EPS8266 ESP-01: LED manipulation seems to interfere with serial communication

I'm playing around with this udp-example. Both this and the blink-example work perfectly. Now I would like to use the LED to indicate what the ESP is currently doing, as well as reading some data over ...
0
votes
1answer
551 views

Arduino Nano + (2* tlc5940) + 34 LEDs = Power Questions

This is an adapted layout for two tlc5940 hooked up to an Arduino nano. The original project can be found here. I am a little unsure about the capacitors and resistors as that project had it hooked up ...
1
vote
2answers
182 views

Controlling a LED array from Arduino NANO

I have a project Im currently busy with that I need a lot of help with. What I want to do i create a flat 8x12 grid of LEDs and be able to control each individual LED independently from the others. I ...
2
votes
1answer
4k views

Arduino Nano TX LED is on

My Arduino nano make weired thing... The TX LED is on when i define a Variable and a digital Pin as output. Do you now if it is a error in the code? If I upload a clear new sketch the LED is off. ~...
4
votes
3answers
35k views

Powering up LED strip - How many amps?

I want my Arduino to drive a LED strip. The LED strip in particular is the 3528 non-waterproof type. To power this up, I need a 12V power supply. My LED strip is going to be 5 meters. Now my ...
0
votes
1answer
54 views

Set pins to LOW over time

I've written a simple sketch that adds threshold to an PIR sensor. If the PIR sensor sends 3 HIGH ex. HIGH...LOW...HIGH...LOW...HIGH (The LOW == no movement) it will trigger and alarm. I want to ...
5
votes
1answer
2k views

No power from Breadboard Power Supply Module

Components Breadboard Power Supply Module IM120525004 1 kOhm resistor Green LED Arduino Nano LiPo 7.4V battery LED Lights Up Fine with USB power from the Arduino LED Does Not Light Up with power ...
0
votes
1answer
247 views

clkI/O 256 & 1024 (From prescaler) not working with driving PWM on Nano board

I've been working with PWM in TIMER0 of my nano board. So, it's working now and I know how to set OCR0A or OCR0B. Then, I went to play with Clock Select Bits CS02 CS01 CS00 in TCCR0B. 0, 8 and 64 ...
1
vote
1answer
103 views

LED bar graph script not working

I have LED bar graph on pins 2-11. Eventually I want to use a voltage divider to figure out the amount of voltage left in a power supply. Currently, this script should set the number of LEDs on the ...
1
vote
2answers
181 views

Digit LED has single input, multiple outputs for each segment. Concerns about “sinking” 5v supply into digital pins

The model name is 5161BS Pins 3/8 are input and the rest are output for each individual segment. I have connected pin 3 to the 5v pin on the Arduino, and the rest to individual digital pins. With a ...
3
votes
2answers
2k views

How to use a Bi-color matrix led 8x8 with 24 pins?

I've just buy this 8x8 LED matrix WLG M20088A/BEG and I'm trying to light all the LEDs in one single color (green) but I don't understand how the 24 pins work for this specific model. I know that ...
0
votes
2answers
2k views

Arduino Nano no output on any controllable pins except for RX and TX pins

I have 2 Arduino Nanos which don't output anything on any controllable pins except for RX and TX pins. I used an LED which I have tested works on the 3.3v/GND and 5.0v/GND. When I try to control the ...
0
votes
1answer
2k views

Blink question with breadboard & LED

I tried a basic Blink example and I found a strange case where : Works Does not work Can someone explain me what is happening ?
1
vote
1answer
5k views

Using an Arduino Nano, how many LEDs can I safely power?

I am working on building a wordclock using one of the several design ideas that you can find all over the Internet. Something like a mix of this one: http://www.instructables.com/id/Sleek-word-clock/ ...
1
vote
0answers
780 views

Arduino PWM LED blinking on four pins, each pin's intensity and time period based on the previous pin

I am trying to make four LEDs glow using my Arduino, based on some relationship between them in terms of brightness and the time for which LEDs glow. For example, the relationships are: pin_3_value =...
2
votes
1answer
11k views

How do i wire a switch to control Leds on a arduino nano

I am wiring some LED's with buttons to trigger them but i don't know if i have the wiring right? Code /* switch * * Each time the input pin goes from LOW to HIGH (e.g. because of a push-...
2
votes
2answers
960 views

Car dome light fading with arduino nano

So I'm working on my car and now I've got my sights on the electrical system. I've installed a keyless entry system and a pulse timer for the dome light. Now, I'd like to give the dome light the fade ...
1
vote
1answer
2k views

8X8 LED not lightning up according to matrix assignment on a Arduino Nano

I'm currently trying to code a simple program that would allow me to light up an individual LED on an 8X8 LED board using a double array. Here are the problems: All the rows can ON individually ...
2
votes
2answers
4k views

Arduino LED matrix and 2D array, data seems to be corrupting

Duplicate of this question I'm trying to drive an 8x8 LED matrix with an arduino nano, but I can't get the LEDs to display what I tell it to. I'm using this LED Matrix Here's my code: int row1 = 2;...