All Questions
19
questions
2
votes
3
answers
79
views
Power Cycling USB
BACKGROUND
I am connecting a USB device to a PCB with a microcontroller. The USB must be power cycled (plugged out and in) in order for the USB to be recognised by the software. The USB connector will ...
- 39
0
votes
1
answer
77
views
Average lifespan of typical project box LEDs widely available for purchase [closed]
I tried searching for this but I just get light fixture LED information. I'm trying to determine the expected lifespan of a typical small LED like you'll find in electronics kits or hobbyist stores. I ...
- 301
24
votes
6
answers
5k
views
Could data transmission power consumption be lessened by transmitting more zeroes?
According to the IEA 250 TWh of power was consumed in 2019 due to data transmission globally, about 1% of worldwide electrical power use.
I would like to pose a very simple question regarding power ...
- 357
1
vote
2
answers
218
views
Should I double data or power lines for UART device
I just have a quick question.
I'm connecting PN532 NFC reader with RPi, for this I am using around 30m of UTP cable from my front door to rack with RPi, preliminary test showed the device is able to ...
- 31
0
votes
2
answers
213
views
Two USB ports for one IC
I have to get two USB 2.0 ports connected to a single chip delivering data and power. If only one port is connected, this connection and power should be forwarded to the IC and if both are connected ...
- 1
10
votes
6
answers
15k
views
Is it necessary to separate DC power cables and data cables?
I have had this discussion with my colleague earlier. A DC power supply is non-alternating, so the magnetic field a DC power wire generates is constant (is it?). Now, I know the rule is to separate ...
- 701
1
vote
1
answer
264
views
Obtaining data from parallel port without the "phantom power" problem
After making failed circuits in the past, I learned that the cause is that the parallel port was producing "phantom power" (aka powering the circuit). This is because I plugged my circuit into the ...
6
votes
1
answer
359
views
USB 3.0 power and usb 2.0 data
I am planning on providing a system with the option of powering via USB.
Now the system will require greater than 100mA, so USB 3.0 interface will need to be used for powering the system.
The data ...
- 61
1
vote
1
answer
2k
views
Communication over DC Bus at low data rate
I am looking for a solution to modulate a data signal into a DC powerline that has 12-60V.
I found for example the DC-Bus solution from Yamar. But they are the only ones offering this and their chips ...
- 53
3
votes
3
answers
9k
views
Will cutting the data lines of USB still let the power to go through?
I am trying to Charge a USB connected device through a computer without transferring data.
An USB 2.0 cable should have 4 wires: Vcc, Data+, Data- and Ground. If I only cut the Data wires and let the ...
- 189
0
votes
1
answer
653
views
If a USB Cable is being used between two devices, are the power wires needed?
I am trying to figure out a way to give power to an android tablet and a DSLR camera at the same time (for a photo booth).
I was able to purchase an AC adaptor "battery" plugin for the camera, but ...
- 350
1
vote
2
answers
9k
views
LEDs and External Quantum Efficiency (EQE), how to find Light Output Power with test results? How to find power?
I'll try explain everything as clearly as I can as it's slightly complicated. I really need help as I'm quite new to this kind of experiment and work so any help would be extremely appreciated.
I did ...
- 23
0
votes
1
answer
2k
views
Can We send data using exisiting power outlets in homes
I am trying to build a project in which I want to transfer data through existing power outlets in a home through power lines while simultaneously using those outlets for power supply also.
My question ...
- 85
5
votes
3
answers
7k
views
2.5mm Jack to USB data Cable
I was recently diagnosed with Type 1 diabetes. With the need to test my own blood upwards of 8 times a day I have a ton of data to keep track of. My testing unit has the ability to upload its data to ...
- 185
4
votes
1
answer
3k
views
How does USB 3.0 negotiate power states?
I noticed, in another question, a comment regarding USB power states. I know that USB 2.0 negotiated power by tying the D+ and D- lines to specific voltages but I can't seem to find any information ...
- 3,598