Tagged Questions
2
votes
3answers
109 views
Turning on multiple leds with arduino using transistor
I want to be able to turn on 50 red LEDs with one pin of an Arduino. I don't want individual control, I just want to be able to turn them all on or all off.
I found this example. It uses a 2N3904 ...
0
votes
0answers
52 views
Receiving SMS using GSM and controlling LED using Arduino
Has someone come up with a solution with the above stated problem?
We are using Arduino Duemilanove and SIM 900 GSM module ...
1
vote
2answers
51 views
Controlling a Servo with a TLC5940 (calculating PWM setting)
I'm trying to control a few servos and a bunch of RGB-LED from an arduino board. To do that I'm going to chain together a few TLC5940 chips. The issue I'm trying to resolve at the moment is what PWM ...
2
votes
2answers
146 views
leds in parallel, switched with NPN transistors
I have the following circuit designed to drive 3 PWM pins off a 3v3 Arduino Pro Mini -- one pin for each of R, G, B in this set of 5 RGB LEDs.
simulate this circuit – Schematic created ...
1
vote
1answer
98 views
Hooking up multiple RGB LEDs while using a minimal number of PWM pins on an Arduino?
I currently have an anode RGB connected to the 11, 10, & 9 PWM pins on my arduino. However I would like to add 3 more LED's to my project, but I don't want to necessarily take up every single PWM ...
2
votes
2answers
113 views
Controlling a LED's intensity with a text file from an SD card
I need your help for a project. My equipment: Arduino Uno, microSD Shield, power LED shield, micro SD card
First, I want to control the intensity of a led by reading a text file. Here is an example ...
0
votes
0answers
156 views
Arduino IR Transmitter & Receiver w/ LEDs Flickering Issue (What's wrong with this circuit?)
I have an Arduino Uno connected to two IR transmitters and respective receivers. Basically, when one of the receivers detects a beam break, I have a strand of LEDs display a pattern. This all works in ...
2
votes
2answers
103 views
Driving 3.3 V LEDs with an Arduino and a shift register
I'm planning to build a simple LED matrix with an Arduino and some 74HC595 shift registers. However my Ardiuno outputs 5 V to the registers which will pass that 5 V on. How and where along the line do ...
0
votes
1answer
125 views
How do I use this LED strip?
I got this LED strip that I'm trying to control with my arduino. I searched for similar strips online but couldn't find any. I only has leads for DIN (blue), GND (black, splits in 2), and +5V (red). I ...
0
votes
2answers
208 views
coding using Arduino, two 74HC595 and two RGB LED, problems with shifting out database
the whole point of this was to be able to send 8 bits of color code to 2 rgb leds through 2 74hc595 registers. if i can get the default color for each led to be sent out then the next part of code is ...
6
votes
1answer
290 views
Accidentally made an analogue touch sensor from arduino digital pins
The other day I wrote a simple arduino script to switch on an LED when a pushbutton is pressed. Without connecting the pushbutton, the circuit created a make-shift analogue sensor that varies the LED ...
2
votes
2answers
153 views
Sync 12 Arduinos - I2C vs Serial
I've been given 12 arduinos (Mega) and 12 breakout boards (custom built. they pump up the output of the digital pins to 12v @120mA) to control around 300 LEDs. I'm using a pseudo PWM library to fade ...
1
vote
1answer
310 views
How to drive high power LED and Arduino by the same power source?
I am building a plant light consisted of 24 high power LEDs (Cree ML-E) and an Arduino Uno. I would like to power the LEDs and the Arduino by the same power source. Since creating circuits for dealing ...
1
vote
1answer
97 views
TLC59116F (i2c led driver) everything seems ok but LED doesn't work
I'm trying the LED driver TLC59116F with an arduino UNO R3. This IC is a i2c controllable LED driver with PWM and 16 outputs. The registers seem all loaded fine, here's a print of their contents:
...
1
vote
1answer
204 views
Multiplexing an 8x8 Matrix - Why Transistors?
I'm trying to understand how to properly multiplex an 8x8 matrix (or any large amount of LEDs)
http://arduino.cc/en/Tutorial/RowColumnScanning
However, I'm getting a bit confused, since I've found ...
