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Questions tagged [input]

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

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2answers
20 views

designing load for the MCU to drive by output current

I am talking about a plain MCU (ATMega32, max 20 mA per pin) output asserting a logic line high or low. I.e. to drive this IC: http://www.ti.com/lit/ds/symlink/ads114s08b.pdf There is a table ...
0
votes
0answers
22 views

STM32F0 input capture and output PWM via the same timer

I'm looking to generate PWM and read a generated frequency via different GPIOs which have the same timer alternative function. Any one knows any existing example from ST or others?
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0answers
82 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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1answer
64 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 // ...
0
votes
1answer
46 views

Led as an input photodiode [Arduino AVR]

I’m trying to use a LED as a light sensor(input) connected to a Arduino Nano. I connected the led with the Anode at digital pin 8 (PB0) with a resistance of 56 Ohm and the Cathode at an analog pin A0 (...
0
votes
1answer
62 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 ...
1
vote
3answers
61 views

Can I connect Inductive Proximity sensor to two different PLC

Some background, I have a tractor that I want to make semi-autonomous. The tractor has it own PLC and an NPN Proximity sensor to measure speed. I have industrial PLC by Unitronics (V130) with I/O ...
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votes
0answers
24 views

MCP4922 buffer feature

I'm using the MCP4922 as a dac with some different python programs. I am using this python package which has a setVoltage_buffered(channel, value) command. To quote ...
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2answers
77 views

Peculiar input current

http://www.cheemi-tech.com/product-current-transformers-CMPT107.html Voltage between B & C is 119V which is equal to 1.19mA but input current between A & B is 14mA. Why is it so? Edit: In ...
-1
votes
1answer
64 views

Voltage time graph integration

In a Voltage time graph , at constant current I= 170 amps, voltage=0 to 5,5 and time= 0 to 97 sec and voltage decreases from 5,5 at 0sec to 1,16 at 97 sec, now how can I find the total power ...
-1
votes
2answers
117 views

Detect 230VAC or 12VDC in the same pin [closed]

I'm designing an input interface for a microcontroller (uC). Want to detect signals (only want to know if there is voltage or not) of different typology, so you can have in the same input to the board:...
0
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1answer
53 views

Creating a Bluetooth input device for PC

I am currently working on a customized input device. Since the Bluetooth connection from the controller to the PC is not as easy as I thought at first, I decided to use a controller which already ...
0
votes
1answer
64 views

prox sensor with NPN open collector output or a dry contact

I am totally new in this field. I want to use a 5 V / TTL signal from a National Instrument to switch on/off a Red lion PXU series temperature controller. But this controller required a dry contact ...
-1
votes
1answer
51 views

Input power vs charge curve (battery charging) [closed]

I want to know when charging a battery whether the charger reduces its current input as the battery reaches 80 percent charge, because it takes longer to charge the battery due to the charge curve. ...
0
votes
2answers
50 views

Read state from LED in another circuit

For a current project, I have to read the state of an LED in another circuit with a Raspberry Pi. My current schematic is this: simulate this circuit – Schematic created using CircuitLab ...
0
votes
1answer
52 views

PIC16F883 over 12V input with resistors?

I am using a ADM00308 with a MTS2916A driver development board from MicroChip. There is a serial port RX & TX which can be programmed into an input. I'll use those inputs to drive the motor a ...
0
votes
1answer
47 views

Resister Parallel to AC Live & Neutral

Hi Guys, I am a newbie to electronics but love to get started learning. So after a few google searches and YouTube videos, I have decided build my own variable Power Supply using an old Computer ATX ...
0
votes
2answers
140 views

How can I design an isolated, wide-range digital logic input compatible with AC and DC voltages from (say) 5V-300V?

There are some excellent suggestions on how to create a wide-voltage range digital logic input on this question. The question is very similar to my needs. I'd like to be able to detect the presence ...
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2answers
143 views

Which analog input design is better?

We are designing analog input with RC low-pass filter and we want to be able to disconnect the filter if needed. So we came up with these two options. 1st option has jumper at the right side and has ...
-1
votes
1answer
69 views

what is the minimum current sinking capability for pic

what is the minimum current sinking capability for pic16f18854? also i need to connect input switch to the pic.i have tried making my own and assuimg suitable data.please help me is this correct.need ...
0
votes
1answer
36 views

Do I need different isolations among long-wire switches?

I'm playing with an MCU board (like Arudino) to read the state of several switches in my home (i.e. magnetic switches). The wires between the sensor and the board are quite long: 15+ meters in a star ...
0
votes
2answers
72 views

Arduino NANOs sharing input signals and controlling Pixel Ring blowing up

We're a bit stuck on the following problem : We've connected a bunch (18 to be precise) of Arduino NANOs on the same +12V supply and they all share the same PWM output from another device (which goes ...
-1
votes
1answer
117 views

Error: illegal Verilog output port specification

I am having problems with my verilog test bench. Every time I try to run it, I get the error in the title above for my four switch registers. I have searched this question numerous times but I cannot ...
0
votes
1answer
54 views

Differences between flip-flop control inputs and clock inputs

I'm studying clocked flip-flops (FFs). However, I cannot differentiate between the two terms control inputs and clock inputs. Can you tell me the differences between those two types of inputs, or ...
0
votes
1answer
383 views

MCU Input Protection

I am working on a simple protection circuit for an I/O pin on an MCU. The device will be 3v battery powered. The MCU's I/O pin has a voltage tolerance of (GND - .6V) to (Vdd + .6V). Pull-to-ground ...
-1
votes
1answer
89 views

What does “LB” out mean in a DC-DC buck converter?

Teacher gave me a schematic,and it includes a DC/DC buck converter with "LB" input and output,but i have no idea what the "LB" is,so i want to ask that does someone know what may the "LB" be?
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3answers
60 views

Wide Voltage Automotive Status To Microcontroller Input

I need to monitor the status of a wire in an automotive application that can have 10-40VDC on it at any time. What is a good approach to limit the voltage to a microcontroller input across such a wide ...
0
votes
1answer
60 views

Input of boost converter or charge pump in the energy harvest [closed]

I read some paper about the energy harvest, and lots of paper said the induced voltage from, for example, the thermo-electric harvesting could be as low as tens of millivolts in a realistic case, so ...
0
votes
1answer
42 views

ST10F269Z2T3 abnormal Input Logic Levels

We are using a ST10F269Z2T3 Microcontroller (Datasheet) in one of our old Designs. Among other things, the ST10 monitors the functionality of external devices using Standard logic Inputs. Eg.: Input ...
0
votes
1answer
59 views

Tristate driver I/O for analog signals

In FPGAs a tristate drive is used to convert a pin from an input to an output or vice versa. Now this works only in digital circuits. Is there a way how you could obtain the same functionality of ...
0
votes
1answer
197 views

Wide voltage range input regulation (24V - 3.3V)

TL; DR: I need a circuit capable of handling input voltages from 24V to 3.3V (with a 10mA/5mA maximum current) and delivering 3.3V to the microcontroller (ESP32) input. Recently, I've been working ...
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votes
1answer
101 views

How I can get a high level with this circuit? [closed]

simulate this circuit – Schematic created using CircuitLab I have this circuit. The MCU on the right select speaker output if I have a low level and if i want audio jack output, i need a high ...
0
votes
1answer
25 views

Maximum input capacitance of IO-Link-Device on C/Q

I have a bit of trouble understanding the IO-Link-specification concerning the input capacitance of the C/Q-pin. The specification says in table 7 (line 754): CQD Input capacitance min: 0 max: 1,...
0
votes
1answer
63 views

How would you calculate the input and output impedance of this amplifier?

How would you calculate the input and output impedance of this amplifier? I have done a lot of research and found so many conflicting pieces of information. Not sure what is right. C1 = 10Uf, C2 = ...
0
votes
1answer
88 views

Input circuit for ESP8266

I built the following simple circuit as an input to an ESP8266 microcontroller: When I hold the switch closed, the input goes low. How do I modify this circuit to do the opposite? I want to press a ...
4
votes
1answer
226 views

Associate std_logic_vector constant with input port VHDL-200X

I am trying to configure a chip over SPI interface using FPGA Spartan 6 Eval board. I just need to configure, I do not need to read the data from the chip, it will be done by another interface. ...
0
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2answers
87 views

Powering 5V IC with 3.8V

I'm trying to power a ESP8266 and ATMega128 from a LiPo battery via the TP4056 charging module. I get 3.8V out of the charging module. According to the ATMega128 Datasheet it is possible to power the ...
1
vote
1answer
667 views

in SPI, can MOSI and MISO be connected together?

I'm using an 8051 series microcontroller, and documentation states that if I use serial mode 0, then its RXD pin can function as a bi-directional pin (both input and output) while TXD is strictly a ...
1
vote
1answer
62 views

Input voltage limits of AD8495 (thermocouple amplifier) vs supply voltage

I'm working on an android multigauge for cars based of a pic microcontroller. Some inputs from sensors are not fed by my circuit so after stumbling upon this thread: http://www.microchip.com/forums/...
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2answers
78 views

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 ...
0
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2answers
83 views

Audio ADC voltage level SNR question

I keep looking for Audio specific ADCs and the majority of these devices work at low voltages on the analog circuitry (5V for example). Lets say we want to process an higher voltage audio input ...
0
votes
1answer
114 views

Connecting a coin receptor to a key press

I want to connect a coin receptor to a keyboard press. I want to have an arcade cabinet with my computer game running. It should only add credits when a specific key is pressed, which can be ...
12
votes
3answers
2k views

12 V input on 3.3 V GPIO, TVS pulled down or Schottky pull up?

I am building my own PLC that has to accept permanent inputs of up to 30 V DC into a STM32F with 3.3 V inputs. The switched input will have to work with 8-30 V, but 90% of the time the ...
0
votes
1answer
237 views

designing a universal 0-10v and 0-300k resistance input circuit

I'm trying to design a universal input circuit which can accept 0-10v as well as variable 0-300k resistance. I'm using this ADC (mcp3008) which has a maximum input of 5 volts , couldn't find an ...
1
vote
1answer
63 views

Can I use a similar AC adapter with different input but the same output?

I have a landline telephone from Japan. The owners manual says only use OUR AC adapter, {Input 100v 50/60Hz 8VA - Output DC 11V 430mA} I want to use this in North America - can I use a AC adapter ...
2
votes
1answer
393 views

Vbe vs Ic characteristics of NPN transistor at different Vce in active region

Below is an NPN transistor characteristics for Vbe versus Ic at different Vcb or Vce: It seems like in the active region, Vbe vs Ic curves gets steeper with an increasing Vce. The following ...
1
vote
3answers
914 views

stm32f4 vdd and interfacing input pins

The stm32f4 discovery datasheet DS8626 specifies vil and vih as below So I have some questions based on the documentation How do I know that what value VDD is operating at if I use the usb to power ...
1
vote
2answers
178 views

AT32UC3C Negative ADC Input Voltage

The AT32UC3C ADC can be set up using either internal or external references as seen in Table 36-8. For any type of voltage reference used, the datasheet suggests that the ADC is capable of converting ...
1
vote
2answers
90 views

Signals shorted when connected to the input of an unpowered IC

I use one SPI bus from CPU to two FPGAs with different (i.e. individual) CS signals. The CPU and first FPGA are powered up, and the second FPGA is unpowered. When I send SPI signals to both FPGAs, ...
0
votes
3answers
197 views

PIC16F15345 Microcontroller, RA5 Digital Input Pin Issues

I've been having a very strange problem with my PIC16F15345 microcontrollers. I'm trying to read a digital input state from a specific pin on the microcontroller (Pin2, or RA5). My setup code is below:...