A message from our CEO about the future of Stack Overflow and Stack Exchange. Read now.

Questions tagged [multiplexer]

A multiplexer selects one of two (or more) inputs based on a control input. It then outputs the selected input.

Filter by
Sorted by
Tagged with
-1
votes
1answer
41 views

Controlling Multiple I/O Devices

How to manage multiple Input(Sensors like Temperature, Humidity, etc..) and output(like motors, relays, etc..) devices connected to a micro controller(Arduino UNO). There are more I/O devices present ...
0
votes
0answers
9 views

Implementing mux function using mux tree

I need to implement mux 8x1 using mux 4x1, and then i have a function : F = ¬AD¬C + ¬AB¬D + A¬C¬D + ABD, and need to implement it using the mux tree. I know how to make a mux tree, 8x1 using mux 4x1, ...
0
votes
1answer
29 views

Individual Digital Control Of LED Array

I am working to create a portable educational element display (about 2 meters wide) along the lines of this one at Griffith Observatory: http://www.griffithobservatory.org/exhibits/...
1
vote
3answers
107 views

Connect a Switchboard to Arduino

Sorry if this is a simple question, but I‘m quite new to Arduino. What I‘m looking for is a way to connect 100+ strain gauges to one Arduino board. Now, those each need a separate ADC (HX711) to ...
0
votes
2answers
62 views

I2C bus switches/multiplexer vs analog switch/multiplexer

I'm refactoring a board that needs to switch the communication between an I2C master (M1) and two identical I2C slaves (S1 & S2 with same address). The first design of this board was using a ...
2
votes
2answers
48 views

Mux UART with 74xx Multiplexer

I have a legacy LPC MCU with 2 UARTs only. One of these UARTs is reserved for different functions such as IAP and RS232. So basically, I have one UART available only. For an experimental project I ...
1
vote
4answers
111 views

74HC595 8x16led matrix arduino

I'm currently trying to learn how multi shifting is working and have therefore started a project where I wanna drive 2X 8x8 LED matrix with an Arduino. I have found it that I should work with the ...
0
votes
1answer
54 views

Remake a Circuit using Multiplexers

I made this circuit yesterday using normal logic gates and chips: $$(AB)+(A\bar BC)+(\bar AC)$$ Now I have to remake it using only MUX but Im having some trouble. From my understanding I should use ...
0
votes
2answers
87 views

Where can I look for USB 3.x superspeed mux chips for poor people that only have through-hole soldering tools?

I'm new to this realm of purchasing and I'm not exactly sure which of the different package names (SSOP, VQFN, etc.) are more friendly than others for basic through-hole soldering. I would also be ...
0
votes
3answers
50 views

Did I implement this function with a MUX correctly?

I have this truth table: Which gives this SOP y = A'B'C + A'BC' + AB'C' + ABC I tried to use a MUX with 2 selects and 4 inputs and I got this (using A and B as ...
0
votes
1answer
28 views

Beginner Analog Multiplexer Wiring Help

beginner here, searching for some guidance as I set up my first multiplexer. My breadboard was wired as follows: The T4 refers to my Teensy4.0 microcontroller, its hooked up to the breadboard ground ...
0
votes
1answer
34 views

pausing d flip flop output

I want to make a digital timer that counts to 99 minutes 59 seconds the problem is that i want to use 4 digit 7 segment display so i have to oscillate the input of the bcd to 7 segment display between ...
0
votes
2answers
76 views

How to mux 10 sensor units with 4-pin that must communicate with a single unit with 3 programmable input

I have 10 sensor units, each unit has 4 pin Vcc, Gnd, Digital out and ...
0
votes
0answers
76 views

AtMega328p and TCA9548 problem

I have a custom made PCB that has an AtMega328p MCU and 4 MLX90614 IR Sensors that are being interfaced by a TCA9548 I2C Multiplexer. When I first got my hands on the board I had 10k pull-up ...
0
votes
0answers
29 views

I need sensing ADC use mux with stm32

There is an LED connected in parallel. If one LED is damaged and the ADC value reaches zero, the MCU detects this. So I designed the circuit using a multiplexer for this logic. However, it is ...
0
votes
2answers
51 views

Simplifying a MUX's truth table

I found this truth table for a 4-to-1 MUX: (circuit for context) I know (I think?) that if I were to make a truth table with 2^6 variables and simplified it I'd get the same SOP as I'd get with this ...
0
votes
1answer
25 views

Implementing 3 variable boolean function using mux 4 to 1 and inverter

I'm trying to understand if it's possible to Implement boolean function with 3 inputs using only mux 4 to 1 and inverter. As far as I understand I can put in the selectors the first 2 variables to ...
0
votes
3answers
87 views

Bit(map) matching in hardware

I want to check (in hardware) whether a bit is on (1) in a 64 bit number - the bit I want to check can be any bit but I'm only interested in checking that one bit. I get the number -ie offset - of ...
0
votes
1answer
42 views

How do I write this circuit (returns 1 if the number of 1s in input is odd, otherwise returns 0) using a MUX?

Here is the truth table: The exercise is to write the SOP of this truth table using a multiplexer with 2 select lines and 4 inputs. I got the SOP expression: $$(\lnot a\lnot b c)+(\lnot a b \lnot c) +...
0
votes
2answers
57 views

Transistors: Switching a higher voltage at the source (not the drain) side

TL;DR: I want to use a lower voltage (5V) to switch current from a higher (12V) voltage source at the source end instead of the drain end. Longer story: I'm trying to control some large seven-segment ...
0
votes
1answer
36 views

What are some good logic simulators for experimenting with multiplexers? [closed]

We've been tasked with showing the numbers on a 7-segment led display with dual 4x1 multiplexers and 3 variables. Our first try was a failure and we won't have the opportunity to experiment in the ...
0
votes
1answer
56 views

Should I use two 2:1 mux or one 4:2 mux?

I am designing a circuit and I am not sure which solution would be more preferred in the design. I'd like to justify why I'd use two 2:1 mux instead of a 4:1, but I don't seem to be able to. To be ...
1
vote
1answer
69 views

Led Matrix multiplexing: sinking/sourcing current + LED brightness

I am trying to make an 8x8 LED matrix (actually a bigger one, but for now it would be easier to discuss this more simplified version) and I have gotten too confused about a few things concerning the ...
0
votes
1answer
26 views

Understanding inputs and outputs on a multiplexer chip

I'm trying to understand the chip selects for some hardware I'm reverse engineering. There are more devices than CPU chip select lines so they are multiplexed using a variety of other inputs, ...
0
votes
0answers
30 views

Demultiplexing analog fast signal for 2-axis piezo movement

I am driving a 2-axis stick-slip piezo stage. Currently, I have two controllers, one for each axis. However, I would like to know how can I reduce it to a single controller? I need a sort of a ...
0
votes
2answers
44 views

Group multiplexer

I've got a project on my Digital Electronics course and I'm stuck. I've got five 7bit sources which I want to choose from by counter and multiplexer. But multiplexer has only one bit inputs and output ...
0
votes
1answer
92 views

Multiplexer that works by measuring voltage on select input?

Is there any small MUX device that would provide 8-64 inputs, which reads from a single select input? I'm thinking that instead of using e.g. 3 select inputs to set which signal input to use, such a ...
0
votes
4answers
86 views

simplest digital voltage selector circuit using common parts

I found the following circuit for the atmel AT89LP4052 microcontroller programmer, but the bottom right section with all those transistors is an awkward way (to me) to make the input to VPP zero, 5V, ...
0
votes
0answers
26 views

How to mux 3 (high power) power supplies into 3 power rails with some pretty complex logic

I just want to say that this may be a bit of overkill but I'm really curious how I'd go about doing this. I'm building a little drone from the ground up and got stuck on this issue. I have 3 ...
0
votes
1answer
40 views

Bi-Directional Multiplexer?

I have two distinct set of lines where one is an input, and one is an output. I want to hook them up to a shared set of lines that will connect to shared I/O pins, with a signal to switch between the ...
3
votes
1answer
174 views

What does this schematic mean?

I know that this is a 4:1 MUX, but what does the little line across the w1 w2 selection line mean? You know, the little black line that has a "2" next to it. Has it something to do with "array" or ...
0
votes
1answer
52 views

In Verilog, How is a 4:1 Mux made using case statements without creating a D-latch?

Whenever I try to make a 4:1(32:8) mux in verilog using the following statement: ...
0
votes
2answers
72 views

how to demux 100V to 300V DC signal into 8 channels?

I need to 8 channels of 100Vdc to 300vdc, load current 10mA to 80mA. my idea is to use a step transformer to step up dc 5v 1A source to 300Vdc 50mA (typical application). low voltage side of the ...
1
vote
2answers
112 views

is it possible to control 8 motors with 74hc4051?

I need to control 8 motors from Arduino. speed control only with a single pwm output I use a single channel at time I have 74hc4051 analog/digital mux/demux ic if I set mosfet drive circuit ...
2
votes
1answer
59 views

How to simulate a simplified model of crosstalk effect in LTspice?

How can I make simple model and simulate the crosstalk between two adjacent channels of a multiplexed DAQ inputs? I observe that in its most exaggerated form, a nearly exact duplicate of one channel ...
1
vote
1answer
126 views

Alternatives to Jumpers?

I have a need to be able to connect a lead on a circuit to 1 of 5 different other leads. I think it’s obvious how I can accomplish this with jumpers or DIP switches or encoders. The wrinkle here is ...
1
vote
2answers
66 views

Signal Multiplexing and Bits

I'm not an electrical engineer, but in reading the documentation of the system I work on, I'm coming across a lot of references to multiplexing. I'm wondering if my understanding of multiplexing is ...
0
votes
2answers
97 views

32 Transistors As a 16x2 Mux

simulate this circuit – Schematic created using CircuitLab I feel as if I already know the answer to this, but I want a sanity check (I'm working in 0V low, 5V high logic level): In lieu of a ...
0
votes
1answer
41 views

How are sampling frequency of an ADC and switching speed of a multiplexer synchronized?

In a typical multiplexed system if we set the sampling frequency twice, does that mean the multiplexer switch loops faster like two times? And what controls the speed of multiplexer? (By speed of the ...
0
votes
2answers
50 views

Verilog Generic Multiplexer - synthesis warning and simulation compile error using Xilinx ISE 14.7 “Port must not be declared to be an array”

I am pretty new to Verilog. I wrote a description for a generic multiplexer in Verilog as follows: ...
0
votes
0answers
54 views

Is ok to use a CMOS Analog multiplexer with voltage from a sensor as an input?

So, I got an analog circuit with an IR sensor that generates a voltage in output. The voltage is a measure that must be read with a microcontroller (I use Arduino Zero). This is the sensor. As you ...
0
votes
2answers
57 views

How much current can I pass through an HCT4067?

I want to use this 16-channel analog multiplexer/demultiplexer (Datasheet: 4067) to pass the output current of a stimulation circuit through different channels. The output current is a square wave ...
0
votes
1answer
74 views

Can't understand what multiplexers do in CPU datapath

I'm currently learning about data path in a CPU and having a hard time understanding the functionality of G,L, H parts in the following image. Why have those parts been used there?Thanks in advance.
0
votes
2answers
110 views

How to control 12 DC motors simultaneously with Arduino Uno?

I am using Arduino Uno. I need to control 12 dc motors rated voltage 9V and current 150mA. definitely, I will use MOSFETs and back emf diode for each PWM output. I need to know whether I can use a ...
0
votes
2answers
52 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
39 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
votes
2answers
75 views

Choosing multiplexer to convert current to different voltage

I want to convert 0-20mA current to 0-1V , 0-5V , 0-10V with different resistors using a multiplexer, but the problem is that my output voltage is not correct and off more than 1V. I know that ...
4
votes
1answer
128 views

Designing an analog high voltage multiplexer

I'm putting together a design for a vacuum tube tester and curve tracer. The circuit I want to build is capable of powering up a tube and measure the voltage and current at the tube's pins. I would ...
0
votes
1answer
73 views

Digital signal appears to improve with length of wire - troubleshooting multiplexed LED display

I’ve created a 5x5 multiplexed LED display that’s behaving very strangely. It appears to have something to do with the data signal from the micro controller to the first shift register which appears ...
0
votes
0answers
210 views

Forming mux demux trees by cascading using strobe

Some definitions When implementing M:1 muliplexer using N:1 multiplexer, where M>N, we cascade N:1 multiplexers, which forms tree of multiplexers. Similarly, when implementing 1:M de-muliplexer ...