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Tagged Questions

1
vote
1answer
78 views

How do I hook up an LED across the tx pin on my Atmega328?

I've built a standalone Arduino and upload sketches via this method From Arduino to a Microcontroller on a Breadboard. I would like to hook up an LED across TX like on the Arduino board, so I simply ...
0
votes
1answer
64 views

Constant Current Square Wave through LED

I am running a somewhat powerful LED, on the order of 3.5V 500mA, off of an ~11V battery using a constant current switched mode power supply from Ebay that uses the LM2596. What I need to do now is ...
0
votes
0answers
4 views

Computer not detecting my Arduino MEGA 2560 R3 [migrated]

I've tried different USB cables, computers, ports and none of them can detect my possibly bricked Mega 2560 R3. Nothing shows up at all in the Device Manager, not even "Unknown Device". When the ...
0
votes
1answer
88 views

USB lights up simple circuit but not coin-cell

I have 13 adafruit LED sequins in parallel hooked up to a CR2032 coin cell. This cell is also hooked up to an adafruit Gemma board (Arduino-like board using an Attiny85). Pads D0 & D1 on the Gemma ...
1
vote
1answer
61 views

How to choose what a power supply to drive 2 x 10watt RGB LEDS?

I'm trying to figure out how to determine what power supply I should be using for different types of LEDs for this and future projects. I have 2 x RGB LEDS: Forward Current: 350mA Forward Voltage: ...
1
vote
1answer
57 views

Controlling various Arduinos with Android

I have an upcoming project which requires me to use about 8 different Arduinos, probably more. They all perform a light show which turns off and on various LEDs at different timings to simulate a ...
4
votes
3answers
440 views

Extending LED length

Completely new to electronics, I've just begun to play with an Arduino. I was wondering, if I wanted to make an LED sculpture, what is the correct way to extend the legs of each LED so that they stand ...
0
votes
1answer
115 views

How can I power this LED Matrix?

I'm controlling a 16x32 LED matrix with an Arduino and have it wired correctly (I think) but I'm having trouble with the power. I tried to follow the instructions from Adafruit but was unsuccessful in ...
0
votes
0answers
53 views

How to power Common Cathode RGB LED

I'm trying to figure out how to power a common cathode RGB LED. The setup I have below does not work. I assumed power would flow to R, G, and B, and there would be a white light; but nothing. Would ...
2
votes
3answers
77 views

Shift Register turning on Transistor for LED Cluster

I have a question concerning using 74HC595 with two transistors to power a LED matrix. My goal is to make an 48 x 8 LED matrix using a cluster of 5 LEDS per unit (as opposed to only using one led as ...
0
votes
1answer
106 views

Arduino pin frequency for persistence of vision (POV) project

Arduino Uno has 4 pins that run at 960 Hz and 2 pins that run at 490 Hz. Are those frequencies fast enough that I can change the strips that lights up the LED and create the illusion that it lights ...
0
votes
2answers
219 views

Arduino driver for lots of high power LEDs

This is my first Arduino/electronics project and I am a little bit confused about the components I need to handle huge amount of currents and the circuit. I want to have full control of 32 (maybe 40) ...
0
votes
0answers
90 views

Poor man's IR obstacle sensor make sense(improve) from signal under daylight

I'm talking about this kind of sensor: Question and then long description: can I do something to improve their blindness in front of window? At least for detection of object in front of the robot, ...
0
votes
0answers
37 views

Multiplex error

I am trying to do basic multiplexing to see if I can get the basics down. When I apply my pins 7,6,5,4 the LED's go on, but if I remove the pins wires the LED's go off. I make sure to apply no power ...
0
votes
3answers
120 views

Powering 16 super bright blue LEDs with Arduino

What is the best way to power 16 super bright LEDs using an Arduino Uno to achieve max brightness? Each LED has the following characteristsics: ...
1
vote
1answer
116 views

Issue with driving multiple LEDs via transistors

I am attempting to individual control multiple LED-based light sources via PWM. Now I am somewhat familiar with transistors and their usage, and had no issue setting up one instance of this control ...
1
vote
2answers
265 views

Do I have other options but shorting out those diodes?

I've been trying to connect my LED stripe -> rgb amplifier -> Arduino Mega 2560 -> PC. After connecting it according to this guide, nothing happened. Looking inside the amplifier I noticed the three ...
2
votes
1answer
78 views

Options for solar rechargeable battery powering LEDs?

As part of my practice I make paintings and drawings with embedded LEDs controlled by an Arduino clone and LED driver. I showed 10 new pieces during an exhibit recently and had great feedback but ...
5
votes
1answer
98 views

ATtiny84 resets on high load

I'm using a ATtiny84 and with three 74HCT595 serial to parallel converters to drive 24 LEDs. Every thing works fine, but when I try to light up more than 10 LEDs at the same time, the ATtiny84 program ...
0
votes
0answers
88 views

Help with ICs, 2-digit 7-segment displays, 74HC4515

Can someone show me how to connect two DC56-11YWA 2-digit 7-segment LED displays to an Arduino Uno or Mega2560 using two 74HC4515s? Is there another IC that I will need in addition? I want to display ...
0
votes
0answers
39 views

Designing a pluggable current/information circuit

I'm trying to solve a technical problem for a project I'm working on, and being from a computer programming background I'm having trouble getting the electrical engineering part off the ground. Please ...
0
votes
2answers
63 views

Arduino and several leds

Can an Arduino turn on multiple leds at the same time?. I want make a home made lamp with several less controlled with an Arduino UNO light sensor and i already have the light sensor, also i know how ...
3
votes
2answers
156 views

How to “deserialize” a digital output to 4 digital outputs

I am working on a small test project for my Arduino and as part of it, I want to display a number on a 7-segment LED system. My first setup involved just direct links to the 7-segment display and ...
1
vote
1answer
117 views

Wild AC to DC for Arduino and high power leds

I've seen some similar posts but none did exactly match. I'm looking to power a Arduino Uno and 1x 10W + 4x 3W LEDs (Using BUZ11 from Arduino output) from a very wild AC source which is on a very ...
3
votes
3answers
103 views

Working with a cathode-based LED seven-segment display

I have recently purchased an Arduino micro and am using it to learn more about electronics and embedded systems. I have a numeric LED display HDSP-H101 with the following circuit diagram, and I am ...
0
votes
0answers
145 views

When using Arduino to multiplex a 10x10 grid of RGB LEDs ( TLC5940NT ) do you need extra power?

When using Arduino to multiplex a 10x10 grid (100 LEDs) using a few TLC5940NTs will I need power above and beyond that of 3 LEDs considering there will only ever be 3 LEDs lit at any given time?
0
votes
2answers
58 views

LED module on Arduino - driver needed?

That an arduino can power some simple led's is basic knowledge. But what about an SMD RGB LED. I cannot find some datasheet for the module I purchased from ebay (I want to use this LED for ...
1
vote
1answer
177 views

Dimming power LEDs with Arduino

I used the following circuit to dim power LEDs with Arduino: I used TIP120 or IFR610 as Q1 instead of IRF510 and I found that if I use IRF610 the current is much more lower than expected. In case ...
2
votes
3answers
137 views

Switching LED with a transistor

I would like to switch a 350mA LED with a transistor. Switching is done by a 5V microcontroller and the main voltage is provided by a 24V power supply. To play around and see what works I used Yenka, ...
0
votes
1answer
173 views

LED glows on low port is set to 0?

I have an Arduino UNO board with a ATMEGA328-PU and am trying to control the LED on output 13 that is on the processor pin B5. I have a switch connected on the Arduino port 7, which is on the ...
0
votes
1answer
101 views

Lighting LED using keypad and microcontroller

So I am working with Gizduino (Arduino clone), keypad and led. What am I doing is getting the value of keypressed and then light up the led according to the value (eg., when I pressed 2 on the keypad ...
2
votes
1answer
97 views

How do I connect this piece of electronics to show the digit display? (from satellite decoder)

I have the following piece of board/electronics: Link: http://i.imgur.com/jwomLz8.jpg Link: http://i.imgur.com/4BCKU21.jpg Now, I recently bought an arduino, so I want to connect the digit ...
1
vote
2answers
560 views

Circuit to dim 40A/12V LED chain with PWM (Arduino output)

We have about 170 feet of LEDs (12VDC, 2.88W/foot) wired up in one chain. Currently they are driven by two switching power supplies (12V/27A). We'd like to control the whole chunk of them together, ...
1
vote
2answers
242 views

Controlling 7W 12-14V power LED with Arduino

I'm trying to control a 7W 560MA 12-14V COB LED Strip using Arduino. When I connect the LED directly to a power supply at 14V (using 1 ohm limiting resistor) I have 0.56A / 12.3V on my LED. But if I ...
-1
votes
1answer
374 views

Using LED amplifier to control LED single color strip with arduino [closed]

I found a description of how to control an led strip using led amplifiers at instructables.com Here is the schema: I need to control the white led strip so, I used only one arduino pin and the ...
1
vote
3answers
299 views

Controling 4 LEDs with 5 pushbuttons and Arduino

My code: ...
0
votes
1answer
243 views

Arduino 12v LED Downlights

I have managed to control an RGB LED Strip with an Arduino Uno R3 successfully. I would now like to switch and dim 12v LED Down lights. I am unsure of how to do this the Transformers I have are ...
0
votes
1answer
55 views

Determining RGB LED strip compatibility [closed]

A tutorial I am following requires the HL1606 Addressable (digital) LED RGB strip, but this is no longer available. Can anyone either suggest an alternative or equivalent?
0
votes
2answers
505 views

Arduino, NPN and common cathode RGBs

I'm trying to design a mood light system using 4 RGB LEDs which will be powered by an external 9V source and an Arduino for processing. Link to Fritzing file Part list: 3 x 2n2222 transistors ...
1
vote
3answers
404 views

How can I scroll through all colors of an RGB LED using an Arduino microcontroller and a single Potentiometer?

The RGB LED is supposed to be controlled by PWM, how can I map the position of a potentiometer to a color combination?
2
votes
1answer
100 views

Arduino powered relay behaving oddly

I bought a spark fun inventors kit in order to learn about arduino. I am attempting to complete circuit 13 http://dlnmh9ip6v2uc.cloudfront.net/datasheets/Kits/SFE03-0012-SIK.Guide-300dpi-01.pdf . It ...
0
votes
1answer
312 views

Pull down resistor not pulling current down to 0 V? - Arduino + LED's

I was recently connecting an LED strand to my Arduino nano using the following wiring diagram: I was using 10k ohm pulldown resistors in order for the LED's to be off when the Arduino is outputting ...
2
votes
0answers
183 views

Ardiuno Uno R3 Plus Digital Pins Overused?

I have an Ardiuno Uno R3 Plus with 14 digital pins, but they don't function well. Or maybe they do, but the point is, I think I am overusing them. I have an LCD connected to ports 13-7, 4 LED lights ...
0
votes
1answer
383 views

Dimming multiple power LEDs with individual constant current PSUs from a single arduino?

Main question: how to individually dimm (PWM) multiple power LEDs that are each powered from a separate constant current power supply, and do this dimming from a single arduino? I have 10 LED ...
0
votes
2answers
174 views

Controlling RGB LED (common anode) with Arduino

I have an RGB LED (datasheet here) that I want to control using an Arduino R3 (datasheet here). How can I do this? The LED has a common anode, not a common cathode. However, the arduino's I/O pins can ...
0
votes
1answer
76 views

Are there any problems with this simple Arduino LED Wiring?

Is it ok that the resistors aren't connected directly to the positive? Any advice, warnings, or rule of thumbs?
2
votes
1answer
107 views

Problem with circuit and led

I have made a board for Arduino that has an DS1307 and an L298P. The board looks that it is working correctly. I have an RGB LED at pins 31, 33, 35 and I try to make them HIGH but the volts that ...
1
vote
2answers
163 views

Setting up and controlling loads of LEDs [closed]

I need some input as I am a bit electronically challenged :) I know a few things but I am actually a programmer. I am trying to find out how to do something like this: http://bit.ly/1gx8Cc8 I was ...
4
votes
1answer
214 views

What is this device included in my Arduino parts Kit?

It was included with the light emitting LEDs so I assume it also gives off light? I understand the the shorter prong goes to negative/ground and the positive prong is longer, but this little thing has ...
1
vote
1answer
328 views

Arduino + TLC5940 + CAT4101

I have a need where I want to control 24 individual LED array connected through TLC5940 & CAT4101 LED driver. I have 144 LED's in 24X6 LED array. These are high power 3W LED's. After searching I ...

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