The input tag has no wiki summary.
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0answers
42 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
101 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
95 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
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2answers
91 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
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1answer
90 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
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2answers
121 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 ...
13
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2answers
21 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
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1answer
73 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 ...
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2answers
133 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
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1answer
56 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
141 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 ...
1
vote
1answer
69 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
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1answer
76 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?
...
5
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3answers
127 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
141 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
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1answer
395 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 ...
-3
votes
1answer
30 views
Streaming video and other information from central device to control everything [closed]
For example, the Wii-U does all of the processing on the console, and then sends the video to the hand-held device. At the same time the device is sending inputs to the console to be interpreted.
...
5
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2answers
229 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
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2answers
151 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
58 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
342 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
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2answers
432 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 ...
0
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1answer
252 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 ...
5
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4answers
272 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
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3answers
274 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?
...
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3answers
708 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 ...
4
votes
1answer
90 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
263 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 ...
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2answers
627 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 ...
4
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? ...
0
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0answers
77 views
Play multichannel sound from PC - LG music center (LM-KW6530X) [closed]
This music center has only 2-ch AUX. Sound from PC plays only on two speakers.
There is a way to play sound from PC on 5 speakers?
Maybe I can enable converting from 2ch to 5ch? When play audio CD ...
5
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2answers
2k 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
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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
172 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
370 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 ...
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2answers
192 views
How can I interface with these 24 V signals?
I have a few 24V inputs to my micro controller from Limit switches. I have conditioned the signals as shown. Pulled down, de-bounced and level converted.
I have some signals that are again 24V but ...
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4answers
741 views
PIC16F877a input always true
I am programming a PIC16F877a with 3 toggle switches and a 20 x 4 LCD. The 3 switches are soldered to pins B0 - B2 on the PIC. The other end of the switches is connected to +5v (PortsB have internal ...
2
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4answers
463 views
Input impedance of an op Amp
I noticed that the input impedance of an op Amp is extremely high. Why is that so?
6
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2answers
2k views
How to trigger a transistor from iphone's audio output jack?
I want to trigger a transistor using iPhone's audio output jack. My goal is to turn off an LED(which is fed by an external +5V battery) by sending an audio signal from iphone's output jack. At the ...
4
votes
2answers
101 views
Trouble chaining multiple low noise op amps
I want to experiment with receiving ELF signals. In particular 76Hz. The goal is to attach a coil of a few thousand turns of magnet wire, place it on the ground, and read the signal level. My ...
2
votes
3answers
909 views
DIY simple line out converter for “floating ground” car head unit?
On a 25W max power (10V p2p @ 4ohms) balanced (push-pull) high level output factory car audio head unit from which I need to feed a mono amplifier (for subwoofer) that only has an unbalanced line ...
3
votes
1answer
188 views
Arduino LilyPad Input Voltages Below the Input Voltage in Specs
The LilyPad spec page says:
Input Voltage 2.7-5.5 V
I understand that an input voltage greater than 5.5 V would damage the device, but what if it's below 2.7 ...
4
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2answers
126 views
Handling audio (from mic to headphones)
Right, I'm new to electronics, but this is what want to know:
What do I need to take a mic input, and output it to some ear phones (standard jack, can be mono). I want to build a motorcycle intercom, ...
0
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2answers
313 views
Conceptualizing an analog input pin on a microcontroller?
As I am trying to learn basic circuit design I would like to build and simulate simple models to test my conceptual understanding. One of the first designs I am trying to tackle is to use an analog ...
4
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4answers
1k views
Why won't my arduino board read an analog pin correctly?
I'm working with an Arduino Uno board. I have a series of voltage dividing circuits off to the side of a breadboard to give me four different voltages. I'm connecting to my laptop.
I am using the ...
2
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2answers
259 views
Input clock signal with noise
I design a frequency divider in FPGA. It is nothing more than the D flip-flop, which use the inverted output as input. Then on the output of D flip-flop is signal with half-frequency of input CLK ...
3
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3answers
3k views
Arduino Mega 0 - 10V analog input?
Is it possible to configure the Arduino to give me 0-10V analog input?
I realize that I can use a voltage divider. I was just wondering if I can use a larger range for the analog input.
4
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6answers
607 views
Input voltage range of opamps
I understand that, for an ideal opamp, Vo is bounded by Vee and Vcc (i.e.; Vee < Vo < Vcc).
But, what about the input voltage range? What is the allowed input voltage range in which opamp ...
0
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2answers
247 views
Glowing pressure plate
I need to build a pressure plate to go on the front of a prop to be used in Airsoft.
The idea is this plate is both an target to be shot at and a visual representation of "health".
My initial ...
4
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6answers
448 views
Simplest possible I/O for Homebrew 8-bit CPU
I am working on designing an 8 bit cpu as a personal project for no real reason. I am using mostly 74HC series chips and am generally focusing on ease of programming over performance.
I am using ...
