Questions tagged [matrix]
The matrix tag has no usage guidance.
109
questions
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1answer
46 views
How to implement an interconnection matrix in VHDL?
I was reading through the documentation of the AXI standard when I came across the interconnection matrix shown below. In short, the interconnection matrix provides a path for several masters to ...
0
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0answers
41 views
Resistor Keyboard Vs Matrix Keyboard
I'm part way through my prototye macro keyboard which currently consists of 4 keypads with 16 keys on each - so 64 keys in total. The method I'm using is the 3 wire, resistor based one.R1,R2,R3 and ...
0
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0answers
29 views
Convert expanded boolean function into a switching matrix
I am given a boolean function f(x) that I have to develop them according certain variables, let's call them a0 and ...
0
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0answers
32 views
Suggestions to build high-power RGB LED matrix display
I'm building an 8x32 matrix display but it has to be high power so people can see it from 700 feet away.
I can't use ordinary RGB LEDs (pixels)so enter image description here I'm using 3 watt pixels. ...
1
vote
2answers
61 views
How to control a matrix of electromagnets
I'm trying to design a matrix of electromagnets, but I'm having trouble on figuring out the control schematic. I need to control the 12V 70mA coils using an Arduino Uno (5V 40mA max output).
...
1
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1answer
28 views
Positive Definitness of Noise Covariance Matrix in Kalman Filter
I am reading a paper on Kalman filter and trying to understand measurement noise covariance and positive definitness of the covariance matrix. It is mentioned in the paper that if the matrix is ...
0
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1answer
73 views
Is this a valid matrix circuit, I've drawn it based on guides and examples online
I'm trying to build a matrix of
6 toggle switches
6 momentary buttons
4 rotary encoders
I'm going to use a Pro Micro board and I'm wondering if my wiring looks okay, this is my first real ...
1
vote
1answer
118 views
How to individually control electromagnets in a 16x16 matrix?
I'm looking to be able to individually control each electromagnet in a 16x16 matrix. It's also important to note that I want to control these via an Arduino and maybe eventually a Raspberry pi - ...
0
votes
2answers
35 views
Multiplexing cell of matrix
in a project I am developing I have a matrix of cells, each cell containing 3 buttons (it will be more eventually, around 10). The schematic is like this:
I want to read each one of the cells, and in ...
0
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1answer
46 views
Transfer function and graphic (Scilab error)
I'm trying to solve this problem with a Scilab code:
I'm trying to follow this code, but in the step [b,a]=ss2tf[A,B,C,D], it shows the error ("Wrong number of ...
0
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0answers
40 views
Three Phase Voltage Measurement
I have matrix rectifier.However, I want to measurement phase voltage by ADC during not rectifying matrix rectifier? Can I measurement phase voltage with passive rectifier?
0
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1answer
55 views
Equivalent Circuit of identical transformers connected in parallel or series
I'm trying to figure out how to solve the equivalent circuit for 2 identical transformers connected in series or parallel on the primary and secondary. Mainly I want to know what the equivalent ...
1
vote
1answer
61 views
Is there a way to optimize this solution for closing two circuits with one button on a scale?
I am (as a hobby) looking into making a keypad with independently scanned keys. I am going with a row-column matrix approach (due to limited GPIO). And would like to utilize MCUs low power modes. Now ...
1
vote
1answer
40 views
Observability matrix different forms
The observability matrix formula is present in two forms in textbooks. My question is about which one to use.
the first one:
the second one:
Now when applying both on the same system, I get ...
0
votes
1answer
61 views
LED Matrix design without micro-controller
I am working on a project concerning the creation of a LED matrix (4 x 6) but without using a micro-controller. It will be powered by a 13V battery and the leds will be controlled by a switch. My ...
0
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2answers
103 views
How to use two Demux to index a matrix layout of registers
Consider the following. Let's say for simplicity sake I have an arrangement of 8 bit registers in a 4x4 matrix layout. I could easily use a Demux that has a 4 bit input select line for the addresses ...
1
vote
1answer
45 views
Controlling a 19x19 input matrix
I'm designing a go board that can detect where pieces are placed through a raspberry pi for the purpose of game recording. I'm planning to put magnates on the bottom of pieces and do the detection ...
0
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0answers
114 views
What will be minimum number of states / state variables for these control systems in state-space model?
Consider the systems as LTI and SISO with transfer functions given below:
I have read that minimum number of states for an LTI SISO system required to represent in state space analysis for any ...
2
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0answers
36 views
Why is any general cutset equation a linear combination of fundamental cutsets?
I have currently started studying circuit theory and my professor introduced graphs to form kvl and kcl equations. When we form the cutset matrix using fundamental cutsets it is easy to understand ...
0
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1answer
85 views
BCD4511 Seven Segment Display Decoder + Diode Matrix
i'm having some issues trying to get a circuit to work that i have found on, yes, the infamous instructables. It consists of a diode matrix that goes to the inputs of a BCD4511 decoder IC. It's ...
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0answers
37 views
How to convert T matrix to Z matrix in two port network?
How can I transform a T matrix to become a Z matrix for a two-port network?
I found the following conversion to get the T matrix from Z matrix from here :
https://www.tutorialspoint.com/...
1
vote
1answer
126 views
Matrix of small incandescent lightbulbs - problem with buzzing
I am prototyping a circuit for controlling matrix display of small incandescent lamps with Arduino (each lamp is 6.3V 0.3A). I designed the circuit in Yenka and built it. It is composed from 3 types ...
0
votes
1answer
95 views
Node analysis with voltage source in matrix form
simulate this circuit – Schematic created using CircuitLab
Can you please check if my reasoning is correct?
The sum of currents leaving node k is:
$$ I_k = \sum_{i = 0}^{n} I_{ki} = \sum_{i = ...
0
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1answer
703 views
Finding Z-parameters from a two-port network and using them to find S-parameters
So I have the two-port network
and I want to find out the Z-parameters of it (and later, use that to find the S-parameters). For the assignment, \$R_x=8Ī©\$.
From what I understood, I should null ...
0
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0answers
43 views
s-parameter matrix analysis
So I'm trying to figure out how I can analyze S-parameter matrices.
The i. should be pretty straightforward, though I'm not 100% sure if I am correct with what it means. I'm assuming that there's ...
1
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2answers
72 views
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
votes
2answers
70 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.
2
votes
2answers
93 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 ...
1
vote
1answer
114 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 ...
0
votes
1answer
49 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} \\...
1
vote
1answer
691 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 ...
2
votes
2answers
346 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
votes
1answer
187 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 (...
1
vote
1answer
107 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 ...
9
votes
2answers
980 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:
...
0
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0answers
62 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 ...
1
vote
1answer
671 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 ...
0
votes
2answers
224 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, itās time to move on to explore alternative types of ...
0
votes
1answer
51 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 ...
-1
votes
2answers
2k 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 ...
0
votes
3answers
548 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
votes
1answer
111 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 ...
0
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0answers
154 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 ...
1
vote
2answers
582 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 ...
0
votes
1answer
113 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 ...
1
vote
0answers
305 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.
2
votes
3answers
809 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
votes
1answer
316 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:
...
1
vote
1answer
468 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 \$...
9
votes
4answers
5k 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 ...
