Questions tagged [matrix]

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52 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 ...
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1answer
100 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 - ...
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2answers
28 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 ...
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1answer
30 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 ...
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39 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?
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1answer
50 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 ...
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1answer
60 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 ...
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1answer
36 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 ...
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1answer
57 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 ...
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2answers
59 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 ...
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1answer
41 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 ...
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89 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 ...
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28 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 ...
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1answer
74 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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23 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/...
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1answer
116 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 ...
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1answer
74 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 = ...
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72 views

How to get relative rotation matrix from two consecutive orientations of MPU6050

I need to find the relative rotation matrix between two orientations of MPU6050. My approach (which fails) uses the MPU6050 quaternion from jrowbergs code. Let quaternion at orientation 1 be q1 & ...
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1answer
377 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=8Ω\$. From what I understood, I should null ...
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0answers
39 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 ...
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2answers
68 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: ...
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2answers
60 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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2answers
87 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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1answer
103 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
43 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
514 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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2answers
257 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 ...
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1answer
167 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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1answer
96 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
900 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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3answers
286 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
58 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
576 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
205 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 ...
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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 ...
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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 ...
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3answers
438 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 ...
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1answer
78 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
151 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
564 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
97 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
239 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
703 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,...
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1answer
252 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
403 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
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 ...
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2answers
306 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 ...
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1answer
765 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 ...