Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [matrix]

149 questions
15
votes
1 answer

Studying the PCB of a 70s calculator. What were they thinking?

I've been studying the PCB from an ELSI 8002 calculator from 1974. I'm thinking of repurposing the case for a project, though now that I've fixed it (by re soldering the battery connectors) I don't know if I can bear to pull it apart. (sniff) Maybe,…
futurebird
  • 652
  • 6
  • 14
15
votes
5 answers

Making an electronic chess board

I want to make a wooden chess board that you can play on with regular pieces (i.e., not modified pieces that make use of RFID codes, magnets, …), but that is connected to a software that takes notice of my moves and acts as the second player. I have…
Golo Roden
  • 603
  • 1
  • 6
  • 16
11
votes
7 answers

How do I control several hundred individual leds with Arduino(s)?

I am working on an electronics project which involves hundreds of LEDs. (Talking upwards of six to seven hundred LEDs...a lot, I know.) Is there any way to control this many LEDs with one or a couple Arduinos? I would like to be able to…
kaffolder
  • 211
  • 1
  • 2
  • 3
10
votes
2 answers

LED Multiplex Anode-Row Driver

I'm helping build this art installation that amounts to a large 16 x 16 pixel display. I settled on using 16 TI TLC5926 constant current driver chips chained together to give me direct drive to each LED. In retrospect I'm doubting myself and…
vicatcu
  • 22,499
  • 13
  • 79
  • 155
10
votes
2 answers

Is this matrix-vector multiplication function in VHDL parallelized?

I have the following VHDL function that multiples a given mxn matrix a by a nx1 vector b: function matrix_multiply_by_vector(a: integer_matrix; b: integer_vector; m: integer; n: integer) return integer_vector is variable c : integer_vector(m-1…
fabiomaia
  • 203
  • 1
  • 6
9
votes
4 answers

How to hook up a 5x7 LED matrix to Arduino?

What is the best way I can hook this 5x7 LED matrix to an Arduino board?
ArduinoFun
  • 555
  • 1
  • 4
  • 10
9
votes
4 answers

How can 16 buttons be connected with only 8 wires?

Here is the product. I understand the idea: these 16 buttons use a 4x4 matrix. 4 lines for rows, 4 lines for columns, and we have 8 cables. But: How can this work without any multiplexer ? Can this detect accurately presses of multiple buttons?…
Basj
  • 1,856
  • 4
  • 27
  • 48
6
votes
4 answers

arduino 3x3 LED matrix

i am trying to get a 3x3 matrix with multiplexing up and running. here is my setup: i have connected each rows cathodes and each columns anodes and connected that one to pins 0,1,2 resp. 8,9,10 the only thing i can get to light is the lowest row,…
clamp
  • 325
  • 3
  • 5
  • 11
6
votes
1 answer

Driving a common cathode 8x8 RGB LED Matrix with PWM

I've got this nice RGB LED Matrix. My goal is to use several of them to create a 16x16 color display. Unfortunately, the display is common cathode. From experiments driving a single LED with 8-bit PWM, I've noticed that there's a visible difference…
joh
  • 191
  • 2
  • 4
6
votes
4 answers

74HC595 Rows/Columns to drive LED matrix

Let's say we have one 74HC595 and we want to light 16 leds (common anode) connected as a 4x4 matrix exactly as in the following picture : So, 4 first outputs to controls 4 rows. The remaining 4 output to controls 4 columns. From what I understand…
Simon Ampleman
  • 61
  • 1
  • 2
5
votes
2 answers

Using a TLC5940 to control LEDs with different forward voltages

I am trying to build an LED matrix (64x32) of RGB LEDs using a TLC5940 current sink LED driver. The forward voltages of the LED components for each RGB LED are: R: 1.8V G: 2.8V B: 2.8V The driver maintains a specified current which helps because I…
Aditya Gaddam
  • 93
  • 6
5
votes
1 answer

Led Matrix using PIC

For a project I am working on, I want to build a 9x9 monocolor LED matrix also with 9 push buttons to control the LEDs using the PIC. So far I have gathered that I think I will be needing shift registers to drive the cathodes and shift-register…
Daniel
  • 53
  • 5
4
votes
2 answers

Why aren't SRAM modules laid out in a matrix?

I'm currently reading about RAM modules. Bigger DRAM module are laid out in a matrix. When retrieving data you first retrieve the row and then the column. One of the benefits of the matrix lay-out is that the row and column addresses are…
Henk
  • 499
  • 2
  • 7
  • 11
4
votes
3 answers

LTspice singular matrix error by changing model parameters

I am trying to create a model of an IGBT with the Z-model from LTspice. Started with the default values it works. When I change parameters more and more I get the "singular matrix error" for certain combinations. I make a DOE, i.e. I change every…
Lutz
  • 61
  • 7
4
votes
1 answer

Incorrect results without printing message

I am trying to make a custom tv remote using an ATmeta328p microcontroller. It contains 28 buttons which are wired in a matrix configuration, resulting in 5 outputs (columns) and 6 inputs (rows). Before ordering a PCB, I want to make sure electrical…
Roy Meijer
  • 53
  • 3
1
2 3
…
9 10