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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Is it Possible to control LED with arudino pins combined with PWM from IC?
What I'm looking to make is a multiplexed 16x16 LED grid with with 2-bits of brightness (aka 4 levels of brightness). There might be a better way to do this.
I've built a prototype 8x8 grid with an ...
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Multiple I²C slaves with different addresses VS. using a multiplexer
I'd like to interface a lot of identical I²C sensors, let's say 32, with a MCU that has only 2 I²C busses.
I can configure each sensor to have up to 8 different addresses. Hence I can have 8 sensors ...
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IVPort raspberry pi camera module
Im trying to design multiplex camera system for my raspberry pi something like this https://www.tindie.com/products/canerdurmusoglu/ivport-dual-v2-raspberry-pi-camera-multiplexer/#product-description
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Pulldown to prevent floating input pins for multiplexer
I'm designing a multiplexer shield for Arduino, by which it will (hopefully be possible to read up to 64 analog inputs such as potentiometers etc.. Schematics of rev.0.1 can be found here.
I'm using ...
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Digital Logic Question involving Muxs
I'm having trouble understanding the solution to this digital circuit problem involving muxes. Could anybody explain how they got to this answer.
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Channel Bleeding with ADG732
I'm building a circuit that uses a 32:1 mux (ADG732) to feed the selected channel into an amplifying stage so I only need one amplifying circuit. The input signals are from pressure sensors which have ...
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SHorting MIPI Mux lines
I am currenty using the TS5MP646 http://www.ti.com/product/TS5MP646 . I need to build a 4:1 mux. I was wondering if I need to use 3 muxes, or can i just short the MIPI traces together and control it ...
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Multiplexing battery voltages with high precision
I would like to multiplex battery voltages used for impedance measurements. The battery cells are not connected. My idea is to have one multiplexer chip for the positive poles, and one chip for the ...
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Connecting mixed-speed multiple serial devices to two microcontrollers
I'm trying to figure out the best way to integrate all devices flawlessly on the 8051 based microcontrollers. If each device was the same low speed, then I could multiplex each and every one of them ...
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ESP8266 I2C Multiplexer
EDIT: I ran an i2c bus scanning program and it detected a device at 0x70 (the mux). I connected the device I am trying to interface with directly to the i2c bus and ran this code and it worked ...
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How do I use a multiplexer to select a logic function?
I have a homework assignment where I'm supposed to use 4:1 multiplexers to select from one of four logic functions in Logisim. However, my only experience with multiplexers in Logisim up to this point ...
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What does the schematic for a 5 to 1 multiplexer look like
I'm having a hard time grasping the concept of a 5-to-1 mux. How can you have 5 inputs if you use 2-input AND gates?
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Battery monitor on ADG507 and AD7705
I'm developing a battery monitoring circuit. There is a problem. I launch a survey of all ports ADG507. For the test, I connect only two power supplies instead of the first and second batteries. The ...
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Multiplexing PT100 with CD4051
I am interested in developing a generic 8-channel 4-wire PT100 interface for RaspberryPi. Needed accuracy must be better than 1degC and range from 0-200 degC. Additionally i need lead wire ...
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Multiplex usage of I/O pins: PWM pulse output + UART
I have the problem, that I have a device with limited output pins and want to know if it is possible to implement a multiple pin usage with additional HW/SW (time multiplexed mode).
In my case my ...
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1.4V instead of 0V when Arduino signals a LOW
I have motor controlling mechanism as the one shown in the image. I'm controlling the direction of a motor controller from three different sources. DIR1 and ...
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TCA9548A Reset Pullup Resistor
Is the pullup resistor on the reset pin of the TCA9548A multiplexer necessary if I do not intend to ever use the reset pin? The datasheet says to "Connect [RESET] to VCC... through a pull-up ...
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Line remapping using a CPLD
On the product I am designing, I have an input connector of 60 lines and an output connector of 32 lines.
The input can be connected to different outside products and then the lines can be mixed, so ...
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high voltage multiplexer for battery cell monitoring
I'm working on a battery management solution with 50.4V battery (36 cells in series with 1.4V a single cell voltage) for automotive application.
i'm planning on using multiplexer and differential ...
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How do I build a multiplexer for this boolean function?
I have a boolean function:
$$F = \bar A·\bar B·\bar C + A·\bar C·\bar D + B·C·\bar D + \bar B·C·D$$
Where the dot means and and the bar means complement.
I plot ...
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Sampling too soon after MUX switching channel
I'm confused with noise created by switching channels on a MUX. My supervisor on my bachelor thesis warned me about sampling too soon after a channel switch, because noise could make the voltage ...
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Can we derive all boolean functions using a 2x1 Multiplexer?
It is possible to implement all boolean functions using a 4x1, 8x1 or a 16x1 Multiplexer.
But is it possible to implement all boolean functions with a 2x1 Multiplexer? I think it is not, because how ...
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Truth Table for the Following Multiplexer Circuit
Is the truth table (shown below) accurate for the decoder/multiplexer circuit (shown farther below)?
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Current Consumption CD74HC4067 for battery powered application
I have some queries and would be very thankful if can clarify the below mentioned questions from the datasheet of CD74HC4067
Link: http://www.ti.com/lit/ds/symlink/cd74hc4067.pdf
Link to previous ...
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Ghosting on 7 segment display
I have an EEPROM (AT28C64B) multiplexed and connected to 3 seven segment displays,
I did so using a tutorial online from ben eater https://www.youtube.com/watch?v=dLh1n2dErzE&t=300s
Sorry for ...
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Multiplex IC 5 inputs and 5 outputs custom? [closed]
Hey all I am wanting to know if there is an IC that allows me to do the following:
Have 5 inputs
Have 5 outputs
Ability to take any input # and direct it to any output #
The latter bullet there is ...
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4bit demultiplexer with address entries in the EXCESS-3 code
My question is: how to make truth table for inputs on E3? There is only space for 2 bits, and E3 is written on 4 bits as I saw. Should I add more inputs for this situation or do this in different way?
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How can I multiplex fully isolated differential signals?
The issue quickly explained
I would like to switch between two fully opto-isolated Tx differential signals (RS422). How can I achieve that if the grounds are different for the signals and the analog ...
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Maximum current on CD74HC4067
I want to build a smart locker using this part
https://www.aliexpress.com/item/32845920160/32845920160.html and a CD74HC4067 multiplexer. Essentially I need to turn on only one lock at time using a ...
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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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Analog Mux as Cheap I2C Mux?
Just looking to have two devices on a single bus with the same address. There are many I2C multiplexers available, but they seem to cost ~4x what a 2x 2:1 analog multiplexer costs.
Any reason I can't ...
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A question about impedance on a multiplexer
I have designed this audio multiplexer
This is a 4 input TRRS audio switcher. Remember TRRS (4 pins: mic, left, right and ground).
I press a button and I change the input that I want to send to the ...
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multiplexing OV7670 video signals
Would it be possible to multiplex video signals transmitted from multiple cameras to a MCU? For example, can 4 OV9655 cameras modules communicate with a STM32f4 MCU?
OV9655 is a CMOS image sensor ...
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What is ΔICC term stands for in datasheet?
This is the datasheet of the MUX (74LVC1G157) I am working with. While I was doing the power calculation, came to the following parameter, ΔICC.
1) What is this additional supply current stands for?
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Multiplexer not switching any audio input
I have designed this audio switch. 1 out of 4 TRRS inputs is selected.
I am testing it but it does nothing.
I press the switch to switch the next channel and nothing works.
The idea here is:
the ...
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Multiplexer for low-voltage measurements
How does voltage leakage (or cross-talk) from a mux affect low-voltage (voltages on the range of 10s of microVs to mVs) measurements?
I am building a measurement set-up consisting of a Keithley 2400 ...
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Measuring resistance at every point in multiplex circuit with analog-to-digital IC
Here I have basic LED multiplex IC (HT16K33). I want to add different resistors in my multiplex circuit and measure them at each x,y position with my ADC IC (ADS1115).
For some reason it won't ...
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Routing one UART Tx output to multiple UART Rx using MOSFET
I have a very cost effective MCU that only contains one UART which can only be mapped to one set of pins. I am not willing to change the MCU choice. I also do not need to use the Rx on that MCU.
I ...
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How to drive a cd4051 analog mux with buttons as channel selector?
I 'd like to control an analog multiplexer cd4051 as a 8-1 switch with buttons that will act as channel selector (1-8)
I know how to do it with Arduino but is there any other way to read the state of ...
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Implementing a multiplexer for a given function
I am a Little bit stuck here. Lets say we have the function $$Y=BC+\overline { A } \overline { B } \overline { C } +B\overline { C } $$
How can I can implement this function with just a 4:1 ...
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Using a clock to increment a counter which drives a mux?
I am trying to program this functionality onto a Xilinx FPGA; however, when I program it to do this, I get no output.
My situation is as follows:
I have 12 bits of data (in parallel): the first 6 ...
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Circuit to enable switching between antennas
I'm trying to build my own portable Wi-Fi router that can switch between small internal PCB based antennas (like this from Aliexpress) and an external directional antenna.
Is there circuit that I ...
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Designing Battery Power System For Robotics
I'm building a mobile robotics project for a class and I'm trying to figure out how to (or even if its necessary) to design a nice battery power system for it. I sort of wanted to learn how to build a ...
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FPGA: efficient way to collect data from many cores within SoC
I am looking for an efficient (in terms of footprint) way to periodically collect data from a multitude of processing elements (PEs) within an Spartan6-based design.
I currently have 16 PEs, but when ...
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Where is the ground reference when using a thermocouple?
I am using a MAX31856 to read thermocouple voltages. I have an ADG707 differential multiplexer feeding the MAX31856 from various ungrounded thermocouple probes (see diagram below). I am using the ...
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2 x 8-channel multiplexers with with linked outputs
I have only one input to measure 16 channels, my intention is to use this circuit below based on the LTC1380 MULTIPLEXER:
The multiplexers have different addresses (AO A1). The output of both is ...
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Minimizing(optimizing) digital logic circuit with multiplexer(s)
(this by the way was an exam question)
For \$F = \sum m(2, 3, 5, 7, 11, 13)\$, I am trying to implement a digital logic circuit using only the following:
2:1 MUX (cost: 12, and must use at least one ...
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Reading a huge number of analog sensors in real time
I'm trying to build a MIDI-like controller that has a neck like a guitar. On that neck, there is a huge matrix of pressure sensors. The controller will emulate 3 strings.
The way this works is:
...
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Why do SparkFun make breakouts for circuit multiplexers? [closed]
I found this product on SparkFun. My first thought was "why do they need to make breakout boards for multiplexers, aren't there ready-to-roll muxes that do this kind of thing that already come in a ...
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Can rotary encoders be multiplexed?
I am currently working on a MIDI based project and would like to use rotary encoders. However, due to the nature of my project I need to multiplex a total of 64 encoders with 8:1 multiplexers.
Is ...