Questions tagged [input]

Something put into a system or expended in its operation to achieve output or a result

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Microcontroller output override another signal, protect uC when powered off

I have a digital signal from somewhere else and a microcontroller. The microctontroller can set it's output pins to be high, low, or high-Z. If the uC pin is high or low, I'd like the output to match ...
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4 votes
2 answers
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What is a "current load" on a 24 V input used for?

The MAX14821 (datasheet) is a 24 V IO device that features selectable current loads for use in actuators on the inputs. What would this be used for? It's not just ...
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3 votes
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Signal conditioning for piezo shock-sensor digital input

I have a piezo element glued to a piece of material, and I want to get a digital signal (to drive an interrupt on an Arduino) when something strikes the material. So, there's a certain noise floor on ...
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2 votes
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95 views

Replace USB diode with something else to reduce voltage drop

So I've made this circuit with a MOSFET and an Op Amp to select a voltage input to my battery. I sort of based it off the voltage selector circuit on the Arduino Uno board, but inversed since that ...
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2 votes
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421 views

Measure input capacitance of I/O pin

I'm looking for a simple laboratory procedure (and required equipment) to measure the input capacitance of each IC I/O pin. Thanks in advance.
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1 vote
1 answer
45 views

Two digital pins for reading buttons, writing to RST

I have an ESP8266 with two buttons connected to pulled-up GPIO4 and GPIO14. The buttons pull the signal down if pressed. I want to reset the microcontroller on every raising edge. I thought about ...
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1 vote
0 answers
73 views

Protection of the pins of an electronic board against overvoltage due to a bad connection

I designed an electronic board with two inputs connected to an ADC (MCP3202), one output connected to the output of an AOP (INA105) and a 24V battery supply. My question is: is there a way to protect ...
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1 vote
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39 views

Linear systems, causality input-output

I have been preparing for a midterm and my professor posted a sample midterm but no answers, i solved the question here and asked him if it made sense, and he said the answer will be fully correct if ...
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1 vote
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49 views

Light sensor circuit

Hello for homework assignment I have to design an electric circuit which takes input from a light sensor and finds if the brightness is bigger than some value. This is what I have done so far: ...
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1 vote
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81 views

Will this circuit damage my Raspberry Pi GPIO?

I'm making a circuit te be able to shutdown my Raspberry Pi after the shutdown sequence is complete to avoid sd card corruption. The circuit looks like this: A little explanation: The battery input ...
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1 vote
1 answer
83 views

What device controls whether a signal is high or low

In circuitry, there is always inputs in circuits (for example: input A and B into an AND gate), but what exactly allows these inputs to switch states? I think the best way to illustrate what I have in ...
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52 views

Multiple inputs into the base of a single FET

I've been wondering if the below configuration would work: essentially using a single FET (instead of a 3 input OR gate) to determine if a clock signal can be read by a sequence of binary counters: ...
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1 answer
60 views

Selecting the right PMDC motor and battery

I'm looking at generating electrical energy from a mechanical input being used to rotate the shaft of a Permanent magnet DC motor. However, i'm a bit stuck with selecting the right motor and battery ...
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81 views

Alternatives to a hardware configuration of an input pin for uC

I'm trying to figure out how to read-in a configuration to the small ATtiny10 microcontroller. I want to find out 5 or 6 different configurations, adjustable by hardware into one IO using the same ...
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1 vote
0 answers
83 views

Using pull-down resistor, but driving pin high by connecting to Vcc directly

I have a device that I know very little about. I have access to Vcc and Gnd pin there, and it operates on +5V. I need to drive its input pin high or low depending on a switch, that's UART RX input. I ...
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1 vote
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66 views

What is input to the RF power amplfiier (gate of the MOSFET)?

I have read that the RF PA is a block just before the antenna. So, the input to the RF PA (voltage signal at the gate of trasistor in the PA) should be a modulated signal and thus the PA just does the ...
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1 vote
1 answer
831 views

STM32F4 input capture

How can get input capture values from STM32F4 for measuring the duty cycles of the four different signal? Here is one channel code: ...
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1 vote
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98 views

Input of BLDC motor

Among the brushless DC motor, is there a motor with two input wire? I thought that bldc motors with hall sensors should have 2 input, but it was hard to find such one. Is it wrong concept about bldc ...
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1 vote
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2k views

Audio input: stereo to mono and filtering DC

I have to get an audio input from a PCB 3.5mm jack and summing right and left channel into one (mono). Then, I have to filter any DC noise from the input. Resistors are 1kOhm each. This, for now, ...
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1 vote
0 answers
147 views

Bell button as input

I got a simple bell system from elcom. It works with 12V AC. When I measure the voltage at the switch it is 1V when not pressed. When I measure the switch sides to the power input of the bell system ...
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1 vote
1 answer
320 views

Combine 1 connector for in and output

To simplify the outside design as much as possible (keeping it simple to use and less expensive) I would like to use just one small 2-pin connector both as output to drive an external led and as 5V ...
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1 vote
1 answer
1k views

P-MOSFET based automatic power selector

I have designed the attached power selector circuit, it has a 12V input and a 15V input, and should prioritize the later. It operates in three different scenarios: 1- 12V source R76+R79 divider ...
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1 vote
0 answers
334 views

Should my external analog input be isolated?

I want to build a device that samples analog signals from various measurement instruments via their analog outputs. The instruments have their own power supply, and all devices are powered from the ...
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1 vote
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439 views

button input staying high?

I have a setup with 12 buttons. 10 of them connected to the arduino pins 0, 1, 6, 7, 8, 9 and analog 0, 1, 2, and 3 (these are all configured with pinMode as inputs in the setup-part of the sketch). ...
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1 vote
2 answers
65 views

What affects a microcontroller IO's VOH_min and VOL_max?

What affects VOH_min and VOL_max? Is it just the current being sourced/sunk by the pin? Or are there manufacturing variances or temperature effects etc that can swing the output voltage away from ...
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41 views

Identify Vintage Power Cord for Sears Electric Tray

I found this vintage Sears electric warming tray but it's missing a power cord. I tried a 2 prong figure 8 cord but the holes were too close together or too small to fit. Here are pictures of the tray,...
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20 views

How to Use ESP32's Input Only Pins with Keypad Library

I am tring to use 1x4 keypad with ESP32. I am using this keypad and this ESP32 (30 pins) also I am using this keypad library I have only free those pins 14,15,34,36 (VN) ,39 (VP) on ESP32. the others ...
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Query regarding MAX20480DATEJ/VY+ voltage monitor

I'm using a MAX20480DATEJ/VY+ voltage monitor for my design. Out of four inputs, I prefer to set IN1 2.5V at the same time for testing purposes. When I'm running my command, I'm constantly getting a ...
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1 answer
47 views

PIC16F886 and Switch Setup with Diode

I would like to make a simple embedded program that will Display what is happening on and LCD screen. When Switch One is pressed, it displays "Switch One". When Switch 2 is pressed it ...
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0 votes
1 answer
49 views

Why is the push button state taking too long to in the program?

I wired up the circuit using a pull down resistor of 10KOhm according the schematic provided. I'm using Jetson Nano (MCU).The push button (DF Robot PB) has three wires, +ve,-ve, and signal, pin 1,pin ...
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39 views

Consequences of having an external signal connected to an output of a LVDS Receiver?

I am trying to debug an issue with an LVDS receiver on a fellow colleagues board. They are using an LVDS differential pair from an FPGA to control a reset line on a MPU on their board. For debugging ...
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51 views

STM32G0 Seems to output 0.77 V on the input pin when set to high impedance and nothing else is connected to it, why does this happen?

Currently I have an a pin on an STM32 set to be an input and floating (high impedance). When the device it was measuring from was powered down and nothing was going on I was measure about 0.35 V on ...
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45 views

Impedance value effect on voltage measurement

When I measure voltage of, for instance, the open circuit voltage at low luminous intensity of a photodetector with ADC Adruino Uno an offset appears. The value is good if the photodecteor (here an ...
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86 views

how this equation is obtained for calculating input capacitor of a fly back presented in UC3842 datasheet?

i know that it refers to stored energy formula for a capacitor according to voltage variations. but i dont have any idea about the specified part. where did this part come from? https://www.ti.com/lit/...
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62 views

ESP - measure time between two inputs in high speed

I have a ESP32, and have 4 digital signals. At the beginning all 4 are low, and as soon as any one of those goes high, the other 3 follow up. I would need to measure the time between the first one and ...
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63 views

Connection of TRRS microphone not TRRS headset

I know for headset T- Left R- Right R- mic S- Ground But for only microphone T - unknown ? R - unknown ? R - mic S - Ground What are those unknown? I want to plug it to my computer which has separate ...
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0 votes
2 answers
125 views

How to Connect an External Signal to Digi-Key SmartFusion2 M2S010-MKR-KIT?

I am currently trying to configure my board to take an external square wave from a function generator, measure the time interval between rising and falling edges, then output the measurement on screen....
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1 answer
74 views

Push on long push off button circuit

I want to design something like this: There is a button, an input pin, an output pin, a voltage input, and a voltage output. If the button is pressed once while the device is off, it won't do anything....
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0 votes
0 answers
47 views

Input DCDC buck filter design equation

I am asking because I am confused. I cannot resolve this issue since yesterday and I am still learning. I was reading article about Input DC-DC buck filter. Each of the two articles say something ...
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  • 11
0 votes
2 answers
354 views

How to design a circuit that the input signal type(positive or negative) can be selected via software configuration

Firstly, Hello to all, I am trying to design a circuit for automotive application that circuit will read positive and negative input signals in the same pin via selecting the type of input in the ...
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0 answers
101 views

ESD Input protection on low Vmax digital inputs (3.6v)

I have a microcontroller monitoring a few digital inputs. The max voltage on these inputs is VCC + 0.3v. VCC is 3.6v so these inputs can't be higher than 3.9v. These digital input are just switch ...
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76 views

Are these input jacks the same?

Apologies for the dumb question. I am wondering if these two input jacks the same. Here's a stereo 1/4" jack designed for a guitar with active pickups: https://www.realparts.com.au/electronics/jacks/...
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0 answers
20 views

Connecting balanced output with unbalaned input using adaptor

I want to connect my audio interface (balanced TRS jack output) with guitar pedal (unbalanced TS jack input) and I wonder if this kind of adapter will work: https://www.amazon.com/dp/B001JYSMV0/ref=...
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  • 101
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1 answer
270 views

Connecting balanced low impedance output with unbalanced high impedance input

I want to send the signal form my audio interface to the guitar pedal effect. I'll use interface's line out balanced output and plan to plug it in to the effect pedal which has high impedance ...
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1 answer
715 views

ESD protection diodes on audio inputs / outputs?

I'm building a digital audio device with 1/4" stereo in and outputs that connect to a CS4272 codec. I'm wondering if and where I should place esd protection diodes. Pictured below is the analog part ...
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0 answers
44 views

Allowing different inputs without needing to alter gain every time; a situation for a pre-amp?

The goal I am attempting to make a small diy bookshelf speaker system using 2 16ohm, 25 watt speakers and a 2x25 watt class d amplifier board. If it matters, the amplifier board is a class d amplifier....
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0 answers
50 views

Comparator resolving input voltages close to vdd

I have a design problem to solve. The problem statement goes as follows: "Design a clocked comparator resolving input voltages close to vdd dissipating less than 100 uA". What does "resolving input ...
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  • 169
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1 answer
184 views

Motor/MOSFET does not react to input on breadboard

I have tried so many different variations on breadboard of this circuit but the motor seems to just be powered by the power rail on the breadboard. It does not react to any change in the input and ...
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0 votes
1 answer
881 views

Input filter on differential amplifier input

Hi, I need to determine the transfer function Vout/Vin. A traditional differential amplifier transfer function without the 2.2uF on the input side would be G1 = (Z2/Z1)*Vin, where Z2 = (2.2uF // ...
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0 votes
1 answer
293 views

Assigning specific bits of vector to outputs in verilog ucf

When I set up my module, I have code like input signed [7:0] SIGNAL but in the UCF I want to assign each bit individually. Currently my code in the UCF looks ...
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