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Questions tagged [device]

The tag has no usage guidance.

2
votes
1answer
61 views

General dimensions and recommendations for a USB dongle

I'm trying to create a device that connects via USB and sits in a users computers USB socket at all times, and I'm unsure of what the general dimension requirements will be. Ideally, this device ...
4
votes
3answers
2k views

Why are “square law” devices important?

In the literature, I often see the notion of square law devices. Why are these devices important, to the extent that they have their own characterization as square law device? In what context does ...
0
votes
1answer
33 views

Connector identification (multipin connector for automotive touchscreen)

This connector is from a device connected to the touch screen in the car. This device is chinese, so I'm having trouble locating information about any part number or name. The connector has 4 wires ...
0
votes
3answers
116 views

What exactly are low speed devices? [closed]

The definition of I2C is - "A multi-master multi-slave serial bus used for communication between low-speed devices". However, I have been searching the web for a concrete explanation for this but ...
0
votes
1answer
36 views
0
votes
1answer
125 views

The forward voltage Vf of a diode

I want to know about the forward voltage \$V_{f}\$ parameter of a diode device, given an I-V charateristic curve and in ambient temperature. What is the criteria to define the \$V_{f}\$ for any diode? ...
0
votes
1answer
70 views

How can I power a device that requires 5-7V and 2.5-6 mA with what I have?

I have voltage pins on one device that outputs 6.23V DC and 70 mA DC. What type of circuit do I have to build that can power up another device that requires 5-7V DC and 2.5-6 mA DC using my 6.23 V ...
0
votes
1answer
69 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
3answers
103 views

How to calculate the voltage used to light up the emergency light from the given details of manual..?

I have an emergency light device which is given by a small manual back side of it with some electrical specification. They are: Voltage: AC90-240V 50-60Hz Current: 0.1A Power: 18W Can I ...
4
votes
3answers
207 views

Good equipments to measure current consumption for IoT devices [closed]

I was asked to bought some equipment to measure the current consumption for the IoT devices. The company is a startup and has a limited budget for this (let's say less than 5k$). I'm looking for an ...
0
votes
1answer
25 views

Connecting power cable to device without enabled power supply = battery low?

Example: Camera or Discman (XP-EV500) with DC power cable: If I connect the power cable to the device, but the charger is switched off or not connected to the wall, then the camera/discman indicates ...
1
vote
1answer
228 views

AC mains wire finder + live wire equivalent circuit [duplicate]

I'm talking about devices for tracing hidden AC mains wires in walls like this one: https://www.ebay.com/itm/3-in-1-LCD-Wall-Detector-Stud-Center-Finder-AC-Live-Wire-Metal-Detector-Scanner-/...
1
vote
3answers
131 views

How to make a self-recognition socket for diferent connectors (sensors)

I am working on an electronic device, to which will be a lot of sensors on wires connected to a panel with sockets. Is there any option that will recognise which sensor is connected to a which socket? ...
0
votes
1answer
133 views

How to spot different electronic devices? [closed]

Recently my university has changed traditional counter meters into intelligent ones where they cut the power for illegal devices. At first as the rules say, the illegal ones are those with power usage ...
4
votes
1answer
953 views

Is there a preferred encryption scheme for encrypting firmware builds on external flash?

I have a product that is going to be deployed in large numbers, and I want to maximize the trouble that someone is going to go through to reverse engineer it (a high level of security). It is an ...
0
votes
2answers
3k views

What's the difference between the term 'Device' and 'Machine'? [closed]

Limiting the question only to the electrical domain. Calling AC machines as ac device mean the same or there is a difference in the terminology.
0
votes
2answers
161 views

Do hardware designer consider software(Firmware or drivers) while designing hardware? [closed]

I like to know what's the procedure of building a new device? Foe example a hardware designer decides to make a new laptop that can run Windows or Linux, or someone wants to build a new Android device,...
3
votes
4answers
700 views

Is it possible to power an arduino-like device from soil?

I am exploring some IoT applications I could work on. One of them is a sensor that does some periodical measurements of soil and saves it into inner memory or broadcasts over low-power radio channel. ...
-2
votes
3answers
217 views

SPI to UART Convert without MCU

I want to make a pcb, there will be the device with spi and i only need to read it's registers and send on bluetooth's rx pin. It's a little bit expensive to use microcontroller to just read registers....
0
votes
2answers
240 views

Difference between electronic component and passive component

I am confused about the difference between a passive component like resistor and an electronic device like diode. I know about their functionality. But my question is why resistor is not called an ...
-1
votes
2answers
86 views

How can i record the rpm of a small spinning object with out the use of a hand held tool such as a laser.

How do I measure the revolutions of a moving object as it rotates around. Imagine a fan blade, I need to measure the rpm of the fan without using an outside tool such as a laser rpm reader. Ideally ...
1
vote
5answers
238 views

Why would I need a low-dropout regulator?

I am creating a device utilizing multiple components, all of which have an acceptable operaating voltage of about 5 V. One component has an operating voltage of about 6 V. I am looking at relevant ...
1
vote
1answer
224 views

How to create device variant with different pin count in Eagle?

I have a part that has 2 variants SOT-23-3 and SOT-23-5. Both have different schematics as one has 3 pins and other 5 pins. Package is also different due to difference in pin count. The problem is ...
2
votes
3answers
2k views

Do electronic devices consume more power when the ambient temperature is cold?

Just a casual observation: when it is winter, my personal devices such as cellphone and Ipad consume power more quickly compared when it is in the summer. But this could simply because of change is ...
1
vote
3answers
412 views

How can cold temperature (refrigerator, air con) fix a broken electronic device?

I had an air con remote control that wasn't working at all. But at some point I noticed that when I turn on the air con manually and the room gets cooler, the remote control works as expected. I ...
1
vote
1answer
443 views

Will a 24/7 plugged-in power cable kill my laptop's battery? [closed]

I'm using a Lenovo Y50-70 and Conversation mode is always turned on (plugged-in, not charging mode). Specifically, my question is: Will it damage the battery (or the laptop) if I leave the power ...
0
votes
1answer
519 views

get PWM values via i2c

-short answer: using an arduino does the Job- "Reading PWM Receiver Signal Using Arduino": https://www.youtube.com/watch?v=ncBDvcbY1l4 I have just started controlling electronic circuits with ...
-2
votes
1answer
89 views

What is this white device? [closed]

I know this question might sound a little silly and this is probably not the best site to ask, but I would really appreciate any answer. My neighbours installed this device just opposite to windows of ...
1
vote
1answer
1k views

Eagle CAD Multiple individual parts in one device

Good day, I am trying to place multiple parts in one device. My use case is a foot print for a XBee chip. The device has two identical 10 pin 2mm SMT headers (NPPN101BFLC-RC: digikey link). There is ...
0
votes
1answer
76 views

What company and/or government permits/licenses are required when selling an electrical device in the United States?

Are there specific licenses that need to be on hand, or any permits that need to be signed by various parties, in the United States, when an electronic device is sold? If it's easier, if the device ...
-2
votes
1answer
482 views

how do you typically tie the address pins and WP pin of I2C device? Do these lines need a pull-up/down resistor or just tied directly [closed]

how do you typically tie the address pins and WP pin of I2C device? Do these lines need a pull-up/down resistor or just tied directly.
0
votes
1answer
5k views

1 Device, 2 Power sources?

I was curious about this. I've searched other similar questions but they weren't quite the same. One mentioned the use of diodes but I would like to know if this would work first before adding ...
0
votes
1answer
124 views

Can someone help to find / create / add a device in Eagle Library?

I want to use FSL176MRT a integrated Pulse Width Modulation (PWM) controller and SenseFET IC in my SMPS's PCB design in EAGLE. It is not available in any library. Its a 6 lead TO-220 package device ...
7
votes
1answer
542 views

At the microscopic level, what exactly forces us into the “dark silicon” (i.e., the mismatch between transistor scaling and voltage scaling) problem?

I've read that if you fix the TDP of a chip, you cannot use all of the transistors simultaneously any longer. This leads me to believe that each transistor requires the same power as in previous nodes ...
3
votes
3answers
374 views

Scanning/photocopying vs. photographing the material

Why do scanners and photocopies scan the material? Couldn't they just have a digital camera + light behind the glass? A lens with fixed focus would suffice, since the sheet of paper would always be ...
1
vote
1answer
561 views

What is the purpose of a T-gate or H-gate in a body-contacted SOI MOSFET?

I've been banging my head against the wall with this question for hours. There are many examples of T-gate and H-gate structures that I've found, but I can't for the life of me figure out why the gate ...
1
vote
1answer
466 views

Why is erasure much slower than write for (NAND) flash?

Typical block erasure time for NAND is on the order of milliseconds which is one order of magnitude higher than write. Both of them are based on FN current. Why? Thank you!
0
votes
2answers
138 views

Voltage regulator question

I have made a portable device charger with a 5 volt voltage regulator(7805-TO220 package),a 9 volt battery and a few capacitors.The problem is,when I connect the charger to a certain device(whose ...
-2
votes
1answer
222 views

wireless device to send data with low latency up to 1km

I need a device about the size of a phone with 2 buttons, the device will be used to let a server know the outcome of an event (2 possible outcomes). A mobile phone app would be the obvious choice but ...
13
votes
4answers
2k 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
2k 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
96 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
1answer
555 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
78 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 ...
-1
votes
1answer
304 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 ...
2
votes
1answer
70 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
229 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
426 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
263 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 ...
2
votes
2answers
98 views

How to customize the 'write' to instrument?

I'm communicating with Power Supply RIGOL DP832A via Ethernet. ...