Questions tagged [multiplexer]

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

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196 views

Optical switch for visible light from multiple endoscopes

This may not be a total fit for the electrical engineering exchange, but its a pretty specific hardware related technical question. I am interested in multiplexing visible light optical fiber signals....
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369 views

Looking for a 24vac switch from 3v inputs

I'm really new to building electronics, so please forgive my ignorance. I'm looking to be able to supply 24vac (~.5A) to one of 16 outputs using 4 3.3v, 50mA inputs. (Edited) The 4 3.3v inputs are ...
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Multiplexing two 7-Segment displays (Ghosting issues)

I am currently working on a simple scoreboard using two 7 segment displays, a shift register (74HC595N), two PNP transistors (2N3906) and an arduino uno. Each 7 segment display is common anode, ...
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Multiplexing 2 digit 7Segment with one Bit

I want to control a 2 digit 7-segment LED with a MSP430 micro controller. The display has 8 input pins per digit (8th pin is the dot, which I do not need) and two ground pins (common cathode). The ...
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What shift register ICs am I looking for?

I'm designing a project that requires far more I/O than a typical microcontroller offers. No problem, right, just use shift registers and stuff. Wait nope, why am I having problems? I'm planning on ...
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Difference between Multiplexer/Demultiplexer and Analog Switch

What (if any) difference is there between mux/demux IC's and analog switch IC's? I'm comparing this in the context of chips with the same IO lines (for example a 1:2 or 2:1 mux/demux vs. a SPDT ...
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1answer
811 views

Multiplexed Display

Need to develop a user display for a home appliance with: Two digit temperature display (Seven Segment). Four LEDs for 'Power ON' and three 'Modes of Operation' of the appliance. I came across a ...
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495 views

How to design system for n bits?

Say I want to design an n-bit system e.g. 256 bits. Can I generalize a 4-bit ALU which I think I know to 256 bits? These are my diagrams.
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Multiplexing Inputs on a microcontroller

I have a 4 way DIL switch that I use to provide input to a microcontroller, and I need to free up a port to use for something else. Is there a way to multiplex 4 inputs into 3 microcontroller ports? ...
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1answer
138 views

Muxed pin of Analog To Digital Converter,ADS8548 - Interface Issue

I am trying to interface TI's ADS8548 ADC with Xilinx XC3S700AN FPGA to get the coordinates from an accelerometer. When I went trough the spec of the ADC, I found that pin20 is a muxed pin for DB11/...
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Why is there a delay in a common anode 7-segment display?

I have a common anode 4-digit 7-segment display. I have each segment cathode connected to a 330-ohm resistor, and the resistor is connected to a shift register. Each segment cathode is connected to ...
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Multiplexing, Animation, Bitmap coding on MCU. How to do it right?

I have been recently getting into programming and micro controllers. I found myself that i don't really know how to do multiplexing, animation, easily displaying pictures on LED display. I have been ...
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How can I use one microcontroller to increment/decrement 4 sets of LEDs using 8 push button inputs?

I want to design a very small project for a portable score keeper. It consists of using one microcontroller to control 4 sets/groups of LEDs on a small PCB. It is a very small scale project (3.5in X 1....
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546 views

Analog Switch Breakdown voltage?

I'm designing a select-able gain circuit using a multiplexer and an inverting amplifier. Here's an example circuit, using a multiplexer. I've read that if you provide a voltage larger than the supply ...
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5answers
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Is an ALU a multiplexer?

I'm studying digital electronics where the components ALU and multiplexer appear. To me the ALU seems like a multiplexer but it's not specifically mentioned that this is the case. Is it so, or why not?...
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868 views

What is a multiplexed network?

What is a multiplexed network? Multiplexing means many to one and sending the result over the network. As far as I know, Control Area Network (CAN) supports multiplexing. How? CAN is said to support ...
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How to properly read values from analog sensors trough multiplexer?

I need to read several analog sensors on a Arduino Mega ADK. I want to use a multiplexer for this (CD74HC4067E), see the schematics. The output however from the multiplexer channels is not ...
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1answer
2k views

How to control and power 25 x 25 nichrome wire matrix

I would like to control and power a 40x40mm size array of 25 x 25 small heating elements which should function just like a visual display of LEDs, but switching heating elements on/off instead. I am ...
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Improving brightness of multiplexed 7-segment led display

I have a two digit 7-segment LED display which is driven multiplexed by a microcontroller. PORTA is for the anodes. In my code I shift a 1 through ...
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1answer
421 views

Multiplexing 12 sensors to be read with 6 ADC channels

I'm buying this Xbee chip. But it only has 6 ADC pins and I have 12 sensors! Can I multiplex my 12 inputs? How hard is it to do this? I don't want to have to use 2 Xbee modules for power/cost reasons....
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Using multiple 4 input multiplexers to get an equivalent 16 input multiplexer

Here is my problem: pretend each of the multiplexers are hooked up to the corresponding bit of each Byte. The first multiplexer is hooked up to the first bit of each of the Bytes (0 - 3). The second ...
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1answer
2k views

How to build an 8 output demultiplexer, using only the two output demultiplexers?

I think its some basic question but I'm really confused about MUX/DEMUX. Should I use 2-output demux's outs for in?
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2answers
8k views

Switching/multiplexing RS232 signal lines

I need to construct a simple RS232 multiplexer. I would prefer a compact SMD solution. What is the most suitable switch implementation? Is there anything preventing me from using MOSFETs for this ...
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Anyone know of a 2-1 mux chip? [closed]

I'm trying to find an IC implementing 2-1 multiplexers, but I could only seem to find chips like this: SN54LVC157A - Quadruple 2-line to 1-line data selectors/multiplexers. Where there are 2 groups ...
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What is the proper and up to date method for multiplexing digital inputs?

So Im following the diagram here for wiring up a MC14067BCP: http://fluidforms.eu/docs/MultiplexedArduinoWiringDiagram.pdf The only difference being that I am doing one set of 16 sensors and not four....
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4answers
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USB Device Sharing

I have a product (or concept of) based on a microcontroller acting as a USB host to control a given device. The device also needs to be controlled by another device (host). Assume that my device has ...
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581 views

How to short two nodes electronically

I am using a Phillips SAA3010 IR transmitter IC to send a modulated IR signal. The IC has two types of inputs: Z0---Z3 X0---X7 And one type of output: DR0---DR7 Each legal operation corresponds to ...
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Arduino Piezo Knock Sensor Synth

I would like to create a synthesizer using 20 separate piezos for the triggers. In other words, each piezo would trigger a separate tone. At the very least I would like to know if connecting 20 ...
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2answers
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Simple solution for driving a large-ish RGB LED array with PWM

I'm working on a small toy-like device that has a 10 x 8 "pixel" array of RGB LEDs at its core; thus there are 10 x 8 x 3 = 240 individual LEDs to be controlled. I'd like to control the intensity of ...
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2answers
800 views

Multiplexers/Demultiplexers

I have a circuit where i have 4 binary numbers, they are all stored in D FlipFlops. I want to be able to pull out one of those numbers based on an "index" number. The index number would be a 2 bit ...
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Design an AND gate using 2:1 multiplexor

I just started my computer architecture course and I'm trying to figure out universal logic, using multiplexors to represent logic blocks. I found this one example how to use a 2:1 multiplexor to ...
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Controlling more relays than the no. of free IO pins a uC has - Low-cost options

While I understand that moving up to a high pin-count uC might be the simplest option, I am looking for Low-cost options to do the same with low pin-count uC. Would like to control a maximum of 8 ...
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Why don't these multiplexers work?

I have an Ardunio controlling two CD74HC4051 muxes. The com terminals of both are connected, so I'm basically using the first mux to select a input, and passing the ...
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295 views

Larger multiplexers?

I ordered a few of these! , turns out they are a lot smaller then I planned (they are the size of a small ant). I was wondering if anyone knew where,if, I can find larger, preferably dime sized ...
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Multiplexed Thermocouple Considerations

I have a side-project to read temperatures from 4 thermocouples (K type, around 500F for coffee roaster data logger), and no previous analog experience at these levels. I've identified two possible ...
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1answer
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Boolean majority function

In this picture is an example of a boolean majority function (may be a bad example) So the rule says that the result or an output of a majority logic function would be a selection of majority inputs, ...
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74HC595 +TLC5940 multiplexing 128 leds -> not enough power

Apologies in advance for probably missing a lot of things. I'm pretty new to electronics. I'm building a 128 led (monochrome) multiplexed array, driven by an Arduino. I'm using a 74HC595 as the ...
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How multiple data transmission (in the form electrical signals) work?

I am studying data communication and networking. While reading about data transfer using electrical signals, I came across 'frequency division multiplexing'. I understood how data is transferred in ...
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Does analog time division demultiplexing need any additional sample and hold?

Quick general summary: In analog time division multiplexing, after combining several continuous signals into a single line, do you generally need to use some form of sample and hold to reconstruct ...
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How can I construct an 8 x 1 multiplexer from two 4 x 1 multiplexers with enable inputs?

I've thought about this problem for two days, and I can't figure out the trick. It would be easy with an inverter and an OR gate, but I was told not to use anything but muxes and wires. I figured out ...
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How does an 8-4 multiplexer function?

I understand the concept of a multiplexer and I can understand how n-1 multiplexers function. Your just sending a select signal to tell the multiplexer which of the inputs at the input pins to let ...
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Linking two 4511's to drive two independent seven digits displays

I kind of remember to had linked two seven digits displays. using a single 7 bits output with two 4511's linked together, but can't find nothing about that in Internet. The only way I had found is ...
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Extending UM91214B to support more channels

In this circuit's description, It is given that we can extend the circuit easily to generate up to 12 DTMF signals. How can that be done?
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Large Multiplexers/Data Selectors

I'm looking for a multiplexer IC with 128:1 or more inputs (256 would be quite nice). I would have thought such a device would be quite common yet I'm having a tough time locating it. It could be that ...
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How a 2-1 multiplexer (MUX) work?

I haven't done EE for quite a long time. I need to implement some MUX, so I started with a two-way MUX. But I don't understand how to make the decision: Wiki- Multiplexer A truth table will show ...
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3answers
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Design of Wiring Harness Tester for Automobiles

I've been given a task to design a wiring harness tester for automobiles. The tester's job is to test wiring harnesses which can contain upto 300 wires. My initial design was quite simple. Feed the ...
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Looking for device that help me split a n bit input bus, or n analog lines into two or more bus at output

I looking for device that help me split a n bit input bus, or n analog lines into two or more bus at output Please consideration concept diagram below. At input there is n bit input bus, or n analog ...
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Board layout help: 64-output Mux! (for possible use in 8x8x8 LED Cube)

So just for practice I decided to design a 64-output mux in Eagle, I figured if its good it could be useful in the future. I did not use auto-router. Here is the PCB: (Click to zoom in) To the ...
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6answers
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Irrigation Valve (24VAC Solenoid) Multiplexing

I have a fairly extensive sprinkler system in which I have used all of the available wires. I've added new landscaping that requires irrigation, but without available wires to use for the valve ...
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Is it possible to drive 4 seven segment display with MSP430G2231?

I'm trying to teach myself electronics and my goal is to create a digital clock with 4 digits. I have an MSP430G2231 which has only 8 available ports as far as I can tell. I saw some methods for ...