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Questions tagged [matrix]

The tag has no usage guidance.

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2answers
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Row Column Matrix Problem with Flyback Diodes

So I had a simple row column matrix which I am driving with mosfets to power solenoid locks like this: GC is ground via 1.5k resistor C is 24V via 1.5k resistor And these are the connectors: ...
0
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2answers
35 views

Can I in any way connect +ve side of my led to uln2083a output pin?If no can I do it with M54562 transistor array?

I had conneced my digital pin of arduino to the uln2803a to drive LED. I want to configure my uln2803a such that i can connect +ve side of the led to the output pin of uln2803a IC.
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0answers
14 views

Generator matrix of TCH3 in GMR satellite

I am interested in finding the generator matrix used for TCH3 channel encoding (GEO-Mobile Radio Interface). I followed the installation steps indicated in OsmocomGMR. There was an example for FACCH3 ...
2
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2answers
74 views

Unusual behavior when controlling a Button Matrix

I have a 4x4 matrix for 16 buttons. Each row/column is directly connected to the pins of an unknown microcontroller. When I connect the pins directly to each other, the microcontroller behaves ...
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0answers
7 views

Options to fuse sensor data with orthonormal matrix

I have created an orthonormal matrix using my accelerometer / tile adjusted magnetometer / and the cross product of these two vectors. the values are normalized -1/+1. Im trying to work out how to ...
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1answer
59 views

How to solve a circuit network involving a resistor parallel to a voltage source using only nodal analysis?

I have been stuck on this for the past week and this week i just dont seem to find out what am i doing wrong. Please help me spot my mistake. Here you can find My circuit on multisim. Please provide ...
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1answer
33 views

Connect 3-port and 1-port devices defined by S-matrices

There are two linear networks. The first is defined by 3-port S-matrix: \$\mathrm{S}_\mathrm{A} = \left[ \begin{array}{lll} s_{11} & s_{12} & s_{13} \\ s_{21} & s_{22} & s_{23} \\...
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1answer
123 views

Vertical ghosting on 64x32 1/16 RGB LED matrix panel

I have been working at driving some of those generic LED matrix panels found all over the web for sale (such as this one), 64x32 I've struggled a lot with the lack of real documentation, but I've ...
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1answer
78 views

9X9 RGB Led matrix, design suggestion

I need to drive 80 RGB leds (so 240 individual leds), physically and conceptually aligned as an 8x8 matrix + an additional vertical line and an additional horizontal line. I'd like to drive the ...
0
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1answer
105 views

8051 program not processing keypad matrix correctly

I made myself a small PCB (measuring about 6cm by 5cm). This is what is supposed to happen: Upon power-up, the LED goes red to indicate that the unit is ready for input. I then press any key down (...
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0answers
39 views

RF switching matrix for DOA

Interested to design an RF Switching Matrix driving a <6Ghz signal from 5 antennas to 2 RX Channels, of the following structure: The possible inputs into the receiver should be: Considering to ...
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1answer
54 views

S - parameters or scattering matrix

i have written in dsp.stackexchange.com, but guzs have written me this question would be better off on this site. I have questions according to how to measure s- parameter. I have a two-port ...
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2answers
596 views

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: ...
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2answers
152 views

Reviving / upgrading a commercial LED sign

I have a commercial LED sign that in its stock format is only controllable by IR remote (the remote is long gone). I'm trying to create a new controller for it so I can push data from one of our ...
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0answers
47 views

Obtaining the analytical expression using the state transformation matrix

I am trying to derive the analytical expression in the box below. T is the state transformation matrix. x_dot=A*x(t) is a second order linear system. A has 2 distinct eigenvalues s1 and s2 and ...
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1answer
259 views

LED and Button Matrix multiplexing?

I have only six GPIO to control a piezo buzzer and 6 LEDs and read 6 buttons... Would multiplexing the 6 LEDs/buttons in a 2x3 matrix work like this (i.e. 5 pins for the 6 LEDs and buttons, one ...
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2answers
150 views

Why does this rotary switch register multiple positions simultaneously?

New to electronics, tackling a project that involves a switch matrix. Having grasped the concept of regular button matrices and modifier keys, it’s time to move on to explore alternative types of ...
0
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1answer
47 views

Controlling 8x8 matrix mounted lamp [closed]

This is an hypothetical question, not for the real build. Let say there are 64 filament bulbs runs on AC 240V mounted in 8x8 matrix pattern. These lamps are to be controlled by only 16 switches (8 ...
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2answers
1k views

Very big matrix multiplication in FPGA

I'm working with convolutional neural networks and I have written a code to make the convolution of two 3x3 matrices. This is my code: https://www.edaplayground.com/x/6G7h Now I want to make the ...
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3answers
240 views

Digital potentiometer mixing matrix

I need to mix 4 analog inputs with different weights into 4 analog outputs with audio application in mind. This can simply be made using potentiometers and opamps for buffering, like shown on the ...
0
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1answer
45 views

What is the mathematical difference between a transfer function and a state transition matrix?

I do know what the difference in meaning is between a transfer function (output over the input) and a state transition matrix $\Phi$ (describes the unforced response of the system). Yet when looking ...
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0answers
106 views

Diode populated keyboard matrix: Wire two separate buttons to the same output?

I have an encoder board for a 16x8 row/column switch matrix. An absolute beginner to electronics but using all of the great online resources for research the best I can. However, occasionally it turns ...
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2answers
420 views

8x8 LED Matrix re-build

the company i work for has tasked me in rebuilding an old LED sign we had replaced. (newer led rgb version) The driver board that was in the sign has gone out. So i am trying to rebuild the driver ...
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1answer
69 views

Setting ground potential in nodal analysis matrix form

I have a general question concerning the matrix formulation of nodal analysis. I investigate a large resistor network with tens of thousands of resistors and some independent current sources. I set ...
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0answers
110 views

Is there any way to do matrix/vector algebra with analog electrical components?

Is there any way to do matrix/vector algebra with analog electrical components? Only addition, subtracting and multiplying. I'm going to build a Linear-Quadratic-Gaussian(LQG) Controller.
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3answers
437 views

How can I read an large array of switches with some microcontroller?

I have been asked by someone whether or not I could do some programming on a large array (something like 18 x 16) of analogue switches. I would want to wire up an array of analogue switches (you know,...
0
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1answer
112 views

IEEE 4 machine system: Need help in computing the bus admittance matrix

I need help in computing the bus admittance matrix for the following Kundur's 4 machine 2 area system: ...
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1answer
249 views

Equivalent resistance of Resistor measurement matrix

To measure a lot of (high resistance) resistors in an harsh environment, I want to setup a matrix of these resistors under test (\$R_{00} \dots R_{nm}\$). The resistors \$R_{x0} \dots R_{xn}\$ and \$...
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4answers
4k views

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 ...
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2answers
241 views

Building a 20x20 matrix with vibrator motor coins

I am currently doing a project that requires a 20x20 matrix with coin type vibrator motors. I am not sure how to pull this off. What is the best way of driving all the motors all together? Provided ...
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4answers
2k views

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 ...
15
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1answer
635 views

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 ...
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2answers
2k views

Creating a DC resistor network matrix

I have the following resistor network and I need to make a 7x7 matrix which would be the solution . I know the resistor values, but not the v1, v2, v3 or any of the current. I'm supposed to combine ...
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1answer
406 views

Certain property of a bus admittance matrix

I have got a simple network for my assignment: I know bus admittance matrix have certain properties that let us form the matrix without writing so many lines of KCL...
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1answer
74 views

Simple Matlab Problem [closed]

I just started working with Matlab last week, so I'm very new. After searching for a while, I realized that I don't know how to fix a Matlab script that I'm working with. The problem is given below. <...
2
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2answers
139 views

state-space model of non-linear system?

This is the equation for which I have to make a state-space model. $$m\ddot y(t)+b\dot y(t)+k_1y(t)+k_2y(t)^3=u(t)$$ For my A matrix I have $$\begin{bmatrix} 0 & 1 \\ ? & \frac{-b}{m}\\ \...
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1answer
143 views

Interfacing thousands of RGB LEDs in a matrix

So I have 3072 RGB LEDs I need to connect in a matrix. I have decided to split the project into smaller matrices and all LEDs are common Anode. Datasheet for LEDs is here: http://docs-europe....
15
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5answers
3k views

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 ...
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0answers
98 views

col not declared issue{Verilog}

I am having a problem here can't make this code compile. It is a 4x4 keypad scanner with a 20ms debouncer. It gives error "Error: 'col' has not been declared" Any suggestion? ...
0
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1answer
393 views

4x4 keyboard matrix not generating unique keycodes

I have a 4x4 keybord matrix fsm scanner but it generates only high keycode setting all last 4 bits to 1 and second and fourth digits to high. Is there anything wrong in my code here? ...
1
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1answer
774 views

How to write a counter in verilog for debouncing an input?

I am trying to write a module counter to debounce a input coming from mechanical buttons. The module should be controlled by the 4x4 matrix button module when to start or stop debonce. This is my ...
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2answers
1k views

Why is my Verilog code for 4x4 button matrix not scanning?

I have a problem with a module in Verilog where I need to scan a 4x4 button matrix. I don't get to scan each row 1 by one but the thing stick with the first row. Can you help me debug it? To me it ...
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2answers
379 views

Mesh Current method for solving a variable resistor?

I have a circuit with a variable resistor R which I need to find the value of. I am told that the power dissipated in the resistor is 250W. The circuit: I used the mesh current method naming the ...
0
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2answers
197 views

Illuminated SPST Switch

I am building a HID device (for flight/space simulators) with an Arduino Micro that will have a 7 column and 4 row matrix plus 4 axes. I have the matrix working fine with normal buttons and switches ...
2
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1answer
144 views

Physical significance of singular matrix in two port network

In class we've been introduced to two port networks, and I was wondering: Is there a physical significance to a singular matrix in a two port network, or is it simply where the mathematical model ...
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1answer
5k views

Keypad Scanner Verilog code problem with state machine and column input

I am developing a Keypad both in hardware and Verilog using a DE2 Cyclone II board. I made a keypad using buttons (switches) that follows this schematic: The scanner works by setting the Column ...
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1answer
72 views

how to calculate Hermitian Toeplitz system of equations on fpga in vhdl

I'm trying to write vhdl code to solve the Hermitian Toeplitz system of equations (solving for the A's). ...
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3answers
2k views

How to calculate power requirements of LED matrix, per row or per LED?

I have built an LED matrix (9x9) and want to run it with Arduino. I am using technique of scanning, lighting up 1 LED at 1 time. The more I am reading about power requirements of a matrix the more I ...
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2answers
230 views

switch matrix with ring counter

Hello I am creating a little device, which has a total number of 30 tactile switches arranged in a matrix with 3 rows and 10 columns. My problem is, that I have only left 5 IO pins on my AVR micro-...
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1answer
95 views

Matrix switch module for electronics testing - what uses?

I'm doing a presentation about NI PXI and such test equipment for school. And I am explaining what the multiplexer and matrix modules can be used for. The multiplexer is simple: Connect, for example,...