The tag has no wiki summary.

learn more… | top users | synonyms

8
votes
2answers
385 views

Inductive and capacitive terms

What it means when we say that some component or device is inductive or capacitive? How these terms are related to capacitors and inductors?
0
votes
2answers
96 views

Detect if usb device is connected on the other side of the cable

Is it possible to detect that there is a device connected on the other side of the cable without using any current sensor? I simply want my arduino to do something when i plug my phone to charger. I ...
1
vote
1answer
38 views

Are drivers and libraries the same?

Can driver for some device (for example LCD display), also be called library (a set of functions for work with)? If not what is the difference, and what term is used for what?
0
votes
0answers
14 views

Why is the conduction band not continuous in flat band condition in moscap

He, I have a problem understanding the band daigram of moscap(MOS capacitor) under flat band condition. In the photo, it's quite clear that the band diagram is discontinuous at the substrate-oxide ...
0
votes
1answer
80 views

How is water resistance of a device measured?

This question has relation to physics as well, but since it is electronic related, it is here. I was watching a video that is testing the water resistance of Apple Watch. They say, at 3 feet the ...
0
votes
1answer
62 views

Charge battery when power up, use battery when power down

I have a tiny little esp8266 that runs happily on 3.3V and draws about 250mA and I can make it sleep and use very little battery power at all. What I want to do is use supplied power when possible ...
0
votes
0answers
221 views

Would the Banana Pi's LVDS output work with this LCD screen?

I've recently completely dismantled an old laptop that wasn't working at all. I know that its LCD (and other parts) are working correctly. I wonder if I could use my LCD screen with the LVDS output ...
0
votes
1answer
286 views

What could this device be? [closed]

I was visiting a hotel and by accident found there is somekind of device under the sink. It consisted of 2 parts that were connected wires. I think it measures something, maybe temperature or ...
1
vote
1answer
48 views

Unified Driver model for low speed and high speed microcontrollers with limited and good memory

I am trying to develop an experimental RTOS. I am stuck in the driver layer design. I want to make the driver layer libraries friendly for the other layers but then again I would like to have high ...
0
votes
2answers
72 views

Building a vehicle tracking device

I need to build 100 coach tracking devices. I am a web/mobile programmer, not an engineer, so I'm going to be looking at outsourcing for this. To outsource this work however I should know the ...
0
votes
1answer
92 views

Making a clock cp for counter, using a photodiode

I need to make a device that counts light impulses, basicly a light detector counter, i need help with my counter cp, how to implement a photodiode(can't find phototransistors in the stores) to do ...
0
votes
3answers
126 views

creating mp3 device playing sound in specific time [closed]

I need help with creating device that will be able to play sound (can be recorded or from mp3/wav...) at certain time, for example at 8:00PM, 8:15PM; 8:30PM ...until 5:00AM. Device must be powered ...
0
votes
0answers
25 views

Transmission using different frequencies [duplicate]

Consider three devices and a base station. Communication is only through radio waves. The devices are equipped with a simple radio that enables them to send and receive information from base station. ...
2
votes
2answers
78 views

How to customize the 'write' to instrument?

I'm communicating with Power Supply RIGOL DP832A via Ethernet. ...
1
vote
1answer
107 views

Don't understand spec sheet

I'm planning to buy a photo-interrupter, and I had a look at the spec sheet, but I didn't see much on the current/voltage of the device. I was thinking that it could run on 20mA, but I am confused ...
0
votes
2answers
103 views

A simple device to remotely alert someone [closed]

We are developing a solution that can remotely alert someone around a relatively small area (around 300 meters). Each user will carry a sort of pager. The server will send an alert to the device. The ...
0
votes
0answers
220 views

Beaglebone black i2c-1 file write error

I am using beaglebone black i2c2 pin 19 and 20 of p9. Somewhere in the bet it was told i2c2 has told accessed with i2c-1 in /dev folder. I am booting default amstrom linux from emmc. Hardware is ...
2
votes
2answers
431 views

unusual transistor markings “C8550”

I am repairing a "wall-wart" charger for a Black and Decker battery powered edger which uses a 12 volt/7 amp hour battery. It has ceased to deliver charge current to the battery but the half wave ...
0
votes
1answer
77 views

Seperate device vs software solution

My apologies, I'm not really sure how to phrase this question. I'm a little confused about what is the advantage of having a separate circuit controlling a module vs connecting the module directly to ...
0
votes
3answers
142 views

What are the big plugs for that you find on high demand devices in North America (120V-Areas)?

Talking about AMEA socket system and 120V. High power demand devices like A/Cs do have bigger plugs with some switches on them. What exactly is their purpose? Seems like a fuse but isn't the socket ...
3
votes
4answers
358 views

Non linear device with two frequencies

I got this on an interview question and I still don't know the answer. What output will have a nonlinear device if we will give two random frequencies \$f_1\$ and \$f_2\$? I answered that it ...
1
vote
1answer
52 views

Determine the output voltage of an integrated ciruit

I'm planning to use an HPA674A (bq25504 EVM) which is based on the bq25504 IC to connect a device (wsn) that works from 2-3.6V which is connected to the Vstor pin and the storage element is connected ...
1
vote
2answers
295 views

How device drivers work

Can anyone explain how device drivers work? I have seen Arduino and other development boards communicating with the PC's USB port with the help of a FTDI chip. This thing can be made to work after we ...
0
votes
2answers
55 views

Devices which consume substantial power in modern embedded real-time systems? [closed]

Could anybody cite examples (if any) of devices and peripherals in modern embedded and real-time systems which consume substantial amount of power compared to modern processors. As processors get more ...
0
votes
1answer
61 views

ATA/ATAPI low level question

I am trying to figure out what exactly is happening on ATA/ATAPI bus right after power-on. From what I understand - host shoud send RESET command, then after some predetermined time send query to ...
2
votes
1answer
313 views

Is there a standard for writing device drivers for microcontrollers?

I have written device drivers for microcontrollers using AUTOSAR. But I was interested in knowing if there are other standards for device drivers. I am planning to write for TIVA TM4C123GH6PM. It has ...
0
votes
1answer
941 views

USB Host vs. Device Detection

Here is a problem to which the obvious answer is "use a switch," but that is not permitted in the design. ;) I am writing software for a USB audio application that is supposed to be able to play ...
0
votes
1answer
197 views

Tech stereo damaged by dimmer switch outlet, why? [closed]

A low end Tech stereo was plugged into an electronic dimmer switch outlet. The stereo was only a few years old and was functioning properly prior to plugging into a dimmer controlled outlet. I ...
1
vote
1answer
145 views

How to design a Circuit that can turn a LED ON depending on the input voltage

I have three LEDs, and I want to turn the first LED ON if the input voltage is 4V , I want to turn the first and second LED ON if the input voltage is 8V and so on. Is it possible to do without any ...
2
votes
1answer
427 views

RFID Based Listening Device

I was just trying to make a passive cavity resonator based listening device just the same way as Leon Theremin did (the great seal bug). I know that I am to use metallized mylar film as the diaphargm, ...
0
votes
1answer
1k views

How can I capture naturally created static electricity so that it won't create a shock when I touch a grounded object [closed]

How can I capture the naturally created static electricity in our bodies, so that it won't create a shock when I touch a grounded object. I'd like to capture it and store it for future use, maybe ...
0
votes
1answer
65 views

Device for recording pic

I'm following this tutorial to make my own recorder PIC18 (http://rengenharia.com.br/?p=401), but I have a problem, I do not have the component "X1" (DB9 female connector for PCB). Anyone have any ...
1
vote
1answer
72 views

Using a Logic Analyzer for Device Drivers (low level)

Sort of a follow up to this question: http://stackoverflow.com/questions/19760764/learning-to-write-low-level-drivers-linux/19761953?noredirect=1#comment29386523_19761953 For example I want to take a ...
1
vote
1answer
160 views

What kind of device is this LT6251 MBR…CT?

Can't find any specs on this device (LT 6251 MBR10100CT or is it MBR|0|00CT or MBRI0I00CT). Can't find datasheet for it.
2
votes
2answers
467 views

Making an obstruction avoiding device without microcontroller

I want to make a toy device which spins to the left whenever there is an obstruction in front of it, without any microcontroller. Can anybody please check whether my approach in building the device is ...
1
vote
1answer
59 views

Optimizing signal voltage level for 5V device

Are there any benefits associated with using lower signal voltages? For example, if a 5V device has an input high voltage level minimum of 2V, would running input signals at, say 3.3 vs 4.5 or 5v ...
1
vote
1answer
1k views

Soldering smallest SMD components such as 0402 with Microscope?

I need to use as small components as possible but I need to do everything by hand. My plan is to use OSH Park for the production of the board. The answers did not focus on whether they used microscope ...
0
votes
3answers
2k views

Cheapest way to build or buy a remote controlled sound maker?

For my high school class's senior prank, we'd like to buy cheap prepaid cell phones (like these: http://bit.ly/VSqOk3), hide them in the ceiling tiles, and then call then randomly throughout the day. ...
-2
votes
1answer
1k views

Home automation appliances wired to micro controller with wireless control from ipad/iphone [closed]

I'm currently going to start developing a media controller for my room. This microcontroller would be controlled wirelessly from my ipad. so there's three parts to this, my ipad, simple ...
2
votes
2answers
172 views

Video camera exposed to lightning in clouds

Suppose you are sitting outside in the dark and the video camera in the mobile is ON. If the clouds are lightning again and again, will this damage the video camera? As our eyes can get damaged by ...
4
votes
2answers
284 views

What is this device?

I found this little device which got my attention. Maybe you can tell me what it is. Is it a I/O board with an OS running on it similar to Raspberry PI? ICs on the device: AMD: AM29F200BT-70EC ...
2
votes
2answers
233 views

Peripheral Devices

I have read few sources that says "Peripheral is a device which is connected to host computer but not part of it. A peripheral is generally defined as any auxiliary device such as a computer ...
1
vote
2answers
1k views

How to create small engine with timer

I'm not sure that this is the correct place to ask, but I have had great success with questions on the other stackexchange sites, so I'll try my luck :) I need a device, which can press a button on a ...
3
votes
2answers
473 views

What would make a laser measuring device more accurate

I was looking a varioos laser measuring devices (laser tape measures). Most of them seem to be accurate within 1/8th of an inch. I'm wondering what the limiting factor for accuracy is. Is it simply a ...
3
votes
1answer
2k views

Streaming camera solutions for RaspberryPi MCU

I'm trying to get a Raspberry Pi MCU to stream an A/V feed over the internet to a web server where I'll have some homegrown software capturing each frame and doing analysis with it. My general ...
3
votes
1answer
1k views

Texas Instruments USB2ANY HPA665

I encountered device made by Texas Instruments with label USB2ANY HPA665. It has LED, mini USB and FloppyDiskDrive-like ports. I can't find any data-sheet, manual or resources what for and how to use ...
6
votes
1answer
114 views

Torque measurement device calibration

I don't know if I'm at the right place to ask this question but here is my trouble : I'm trying to find a good way of calibrating a electronic device used to measure small torques (0 -> 25 mNm). ...
2
votes
2answers
4k views

What is the purpose of a splitter?

I have a splitter SVI Digital SV-2G Splitter (5/1000MHz) from my Comcast high speed internet self-installation kit. I try to understand what a splitter is used for, so I found this Wikipedia ...
7
votes
1answer
399 views

Why are 5 mm LEDs always rated at 20mA?

OK, maybe not all of them, but by far most of the 5 mm LEDs I've ever handled are rated with I(max) = 20 mA and I've been using them for maybe over 15 years. Why is this? Is caused by the size of the ...
7
votes
4answers
407 views

Dead or alive: Operational transconductance amplifier

My first experience ever with an operational amplifier was with an LM3900 from a Philips experiments kit and these kits date from a long way back in time, when I was a young boy in primary school. I ...