Something put into a system or expended in its operation to achieve output or a result
2
votes
2answers
95 views
How can I get this to not read an arduino digital input?
I have been working on this for a while. It is a small part of a much bigger code.
I have a digital input pin connected to a on/off switch and another input pin connected to a momentary push button. ...
2
votes
2answers
79 views
What does it mean for an input impedance to be “differential”?
In a specs of a data acq. device the input impedance is shown as "20 MΩ differential". Does that mean the measured impedance in diff input case? If so how can I calculate the input impedance for ...
1
vote
1answer
47 views
PIC (16F627A) inverted inputs
I'm having problem with inputs of my PIC.
There is somethink like "default value" on all inputs set to logical 1 so if I want to change the state I need to pass GND.
How can I turn it "otherwise"? ...
3
votes
1answer
62 views
Digital input ports of the dsPIC30F4011/4013 not working on the dsPICDEM 2 Development Board
I have a Microchip dsPICDEM 2 Development Board with two microcontrollers on it: a dsPIC30F4011 (Motor Control Family) and a dsPIC30F4013 (General Purpose Family). I'm programming in C using the MPLAB ...
1
vote
0answers
36 views
ADC Input Stage Impedance
I plan to use the TI ADS1178 (datasheet) ADC. The ADC specifies a "Differential Input Impedance" = 140kOhms (low-power mode). Would this input impedance be the same for single ended inputs when using ...
3
votes
2answers
109 views
How to limit negative voltage on uC input pin
I'm trying to design a pulse induction metal detector to increase my EE skills a little bit.
I started to sketch out the transmitting stage, which is just a MOSFET that switches current through a ...
1
vote
1answer
85 views
CD40106 output voltage
I'm testing some CD40106BE from Texas Instrument, CMOS Hex Schmitt Trigger (Datasheet Here).
Vdd = 5V (Pin14)
Vss = GND (Pin7)
Vin = 5V
I measured a Vout = 3.8V on every IC I tested, with a Led on ...
1
vote
0answers
138 views
How to wire a button for input on an Attiny85 using Arduino code?
I am trying to "shrink" my arduino project to an Attiny85. But for some reason I cannot get an input button to work on the Attiny85? To simply the circuit and to make sure I didnt make a mistake ...
6
votes
1answer
122 views
What's mean these microcontroller pin input/output modes?
I bought an stm32f103ret6. When I saw the reference manual, I saw that it has several I/O modes.
For input: floating, pull-up, pull-down
For output: analog, open-drain, push-pull
I have already ...
2
votes
2answers
391 views
What is a “dry contact input”?
I'm a PC software guy, a newbie to electronics. Recently, I've got a project in which I need to source for a DAQ that can provide dry contact inputs to an interfacing digital output controller. The ...
7
votes
1answer
311 views
How is this 5-24V input circuit working?
Since I require some kind of wide range input (going to a microcontroller) for a new project, I looked through some designs that are already in use (or were considered at some point) for other ...
0
votes
0answers
56 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). ...
1
vote
2answers
77 views
A 4.8v reading on a loose pin 0?
I have a setup that demands that I use all my I/O's on my Arduino Uno R3 board - including the serial pins 0 and 1.
So I've initialized those pins as inputs, but when I make a reading on pin 0 it ...
0
votes
3answers
152 views
Microcontroller I/O configuration
I have been using PIC microcontrollers and have been using MikroC for the programming but I am little bit confused about the ports. On a PIC16F84A the port is defined in mikroC as ...
8
votes
2answers
265 views
How can I check input of USB?
I have following wire as shown below, one end has male USB connector and other end has four wires. I know, when connected to laptop, the RED one acts as voltage source and BLACK as ground. If I give 2 ...
7
votes
1answer
160 views
Should I use a resistor between an input pin of MCU/CPLD and VCC/GND?
Some times, I want my MCU or CPLD to input a static logic. So, I choose to tie it to VCC or GND. The problem is that should I put a resistor in series to limit the current? I just think by myself for ...
0
votes
1answer
125 views
Connect different devices (Ground/Voltage mismatch)
To begin with, I realize that voltage is relative but I do not get how to get a common ground so that everything is relatively correct to go in and out of the chips.
The picture summarizes the setup:
...
0
votes
0answers
57 views
Using TLP280-4 with STM32F1xx MCU
This is a continuation of my previous question.
Olin Lathrop explicitly explained me the previous question, but also set thinking on the exact way of connection the optocoupler to a MCU input.
I ...
2
votes
2answers
196 views
Bipolar Op Amp w/ Near Zero Offset?
My understanding is that if source resistance is low, a bipolar op amp has 10dB less noise than a JFET. I prefer the JFET op amps because the input offset is so low that you can eliminate coupling ...
4
votes
3answers
168 views
Using Single Ended Output with Differential Input by Grounding one Input
I am making a frequency generator using the AD9833 (programmed from the PIC16F876). I wish to use a Programmable Gain Amplifier to adjust the signal level before being sent to a power amplifier ...
0
votes
2answers
114 views
Continous rotary input?
I need something to work as an input for a rotary device. It must be able to rotate continously, accurate to a degree of rotation, and so that any extra full rotation will have no effect on the input, ...
0
votes
1answer
247 views
How to use the PIC16F628A's PORTA,4-7 as inputs?
I'm working on a countdown timer and I want to use the MSN of PortA for my switches.
I'm using MPLAB. I can't use C to program the PIC because the collage taught us to program in decimal, and they ...
1
vote
2answers
194 views
What is the correct term for this type of USB Input devices?
Hi, I'm working on something where I need to use a huge amout of these little guys (picture attached), probably around 32 or more for a start.. The problem is, I need to be able to connect all of ...
14
votes
2answers
579 views
How do I extend the number of analog (input) pins available to me?
I already know how to extend the number of digital pins on an Arduino using a multiplexer.
I want to increase the number of analog input channels that I have. One solution is to add another Arduino ...
0
votes
1answer
92 views
Why the Locking Buttons? (Project for blind user)
I was trying to build this: http://www.shaungehring.com/2013/01/03/raspberry-pi-project-1-pandora-streamer/ for a blind user. The large buttons are a key aspect for this target user. But, I've noticed ...
0
votes
2answers
174 views
5v output to 3.3v?
I have a microcontroller and a Raspberry Pi, both running off of the same 5v supply, in parallel. The microcontroller has 4 5v output pins and the other is a Raspberry Pi, that can only accept inputs ...
0
votes
1answer
65 views
How do we OR two bits in ATxmega128?
I am working with ATxMega128 and programming it in C.
I have two inputs coming from a sensor and I want to turn on an LED when I get output from either of the sensor.
I can blink my LED if i get ...
1
vote
1answer
314 views
Build an Audio Toggle Box
I want to build a small box with two audio inputs and two audio outputs, with two switches to control the current input/output. Something like this: http://www.youtube.com/watch?v=mQzLnt0_-zU
I've ...
2
votes
1answer
99 views
Digital Circuit question - sensing input across power rails using a micro
In the Circuit shown below, I am trying to achieve the following (I know my circuit is not correct, it is an attempt).
Problem: WHen INPUT_N = 0V, the input to the microcontroller does not go low.
...
2
votes
1answer
141 views
LD1117 vs LM1117
If I'm driving, say, a 500mA load, would you guys think that I could use these two parts more or less interchangeably?
...
6
votes
3answers
173 views
How can we read two digital inputs simultaneously from ATxMega128?
I am new here..
I have two IR sensors that give digital output (0 when there is something in front of it and 1 when there isn't).
I am using a ATxMEGA128 to run motors using these sensors but I am ...
0
votes
1answer
335 views
Increase the analog sample rate of the IOIO?
On the analogue input wiki page for the Sparkfun IOIO (android development board), it says that the analogue pins are sampled at 1kHz. This is too low for a number of potentially exciting uses, like ...
-2
votes
1answer
1k views
Can I connect a BNC output of DVR to the antenna input of a LED TV? [closed]
I have a DVR and a LED TV. The DVR provides 2 video outputs, VGA and BNC but the LED TV only accepts 2 possible video input (HDMI and antenna socket).
In my mental model, as the BNC output of DVR and ...
5
votes
2answers
493 views
False Positives on Arduino Input
I've used analog and digital input for a multitude of applications with the Arduino Uno board. It has continuously given extremely non reliable readings, where the analog input is always fluctuating, ...
2
votes
2answers
262 views
How do I get a relay to recognize when a TRRS jack is plugged into my iphone?
I'm working on a project where I would like to put an aux input in my car. I was thinking of hooking up my CD changer output wires to a relay and then hook up the aux wires to the other part of the ...
1
vote
1answer
67 views
Capacitive pen input sensors on screen edge
I've got a couple Kobo Touch devices in my possession. I've recently started hacking on the software. I'd love to enable stylus input by putting a Wacom or similar tablet behind the screen, but I ...
4
votes
3answers
582 views
Using lots of slide potentiometer for computer control
I want to mount a bunch (say 16+) slide potentiometers in a long project box (or other housing that can sit on a desk) that I can use to interact with software on my computer, specifically lighting ...
0
votes
2answers
572 views
SCT sensor to 0-10v analog input
I'm trying to read values from a SCT-013-030 sensor that gives 0-1vac readings .
My board analog inputs are 0-10vdc,giving me a value from 0 to 65500 .
I need to know what is the best method of ...
1
vote
1answer
345 views
Use port for comparator and analog input?
I'm trying to use Port F on the PIC18F65J11 as both analog inputs and a comparator. For example, there are 7 pins on Port F, and I'd use 3 pins for comparator (2 comparator inputs, 1 comparator ...
6
votes
4answers
351 views
Does a switch need to be debounced when opened?
Suppose that an input on a microcontroller has a pullup resistor to 5V and a switch to ground (normally open) connected to it. I know that a switch should be debounced (in my case, in software) when ...
5
votes
3answers
345 views
Does there exist an IC that allows on-the-fly routing of signals?
Do there exist ICs with N input pins and N output pins which, either via EEPROM setting or via on-the-fly control by a microcontroller, allow one to route each of the N inputs to ANY of the N outputs?
...
2
votes
3answers
1k views
What kind of diode to use with ADC inputs
I am looking for diodes to protect my ADC from over voltage conditions. From what I have researched so far, I know that I need schottky diodes hooked up from the input to the ground and the input to ...
5
votes
1answer
111 views
Input and Output pin voltage specs on a datasheet
I'm a bit confused about input pin voltage tolerances and output pin voltage values of ICs.
I would think that datasheets for ICs that involve signal inputs/outputs would list two values:
The ...
4
votes
2answers
405 views
Is it OK to rely on an ADC's internal protection diodes?
Related to: ESD protection of ADC input.
To protect an ADC input from out-of-spec voltages, including ESD, it is often recommended to use diodes connected to GND and Vcc. If I have a 1k series ...
1
vote
2answers
985 views
difference between dry contact mode output and open collector output
We have a device which can work with dry contact input and a device which gives open collector output. Will it inter-operate?
Is there any difference between dry contact mode output and open ...
5
votes
7answers
1k views
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? ...
10
votes
2answers
3k views
opto isolated arduino input
I want to protect a pin with an opto isolator to get an external signal from an electrical meter (35VDC max, 50mA max, 240ms pulse width). The purpose is to count the pulses.
Do you have some ...
5
votes
3answers
2k views
Arduino Analog Input example clarification
First of all I'm total nub in electronics.
Recently I got an Arduino Nano. Now I'm trying to understand why there is no potentiometer nominal at http://arduino.cc/en/Tutorial/ReadAnalogVoltage ...
2
votes
1answer
233 views
how does better isolation between gate and channel in a mosfet, result in a higher input impedance?
I wanted to know what are the factors that affect the input impedance of a device, majorly in a MOSFET, how does better isolation between the gate (resulting in less leakage current) result in a ...
4
votes
1answer
425 views
Measuring input current of opamp
I want to measure the current that goes into a noninverting opamp input. I've setup my experiment as follows:
I can't measure the voltage drop across the 10M (R1) resistor directly since my DMM has ...