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Results tagged with power
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user 590
Power is the rate at which energy is supplied or consumed, often measured in Watts. This tag covers electrical power specifically, the voltage and current specifications for supplying power to the Pi, the specifics of power consumption by the Pi, and methods for controlling Pi power consumption.
3
votes
Accepted
Turns off when touching test points
That looks like the power is being shorted out
Perhaps your meter is on the wrong setting. …
- 12k
1
vote
USB Power backfeed without Polyfuse mod
The polyfuses have a pretty wide tolerance, and can also be very slow to act. The Pi might work indefinitely like that, or the polyfuses might kick in eventually
- 12k
1
vote
Safe way to shut of Pi without keyboard, access to command line ,etc
Assuming you know roughly how long the pi needs to run (battery capacity etc), just have a process that sleeps for X seconds and then shuts it down.
- 12k
1
vote
Is it possible to power the RPi by re-assembling the ethernet port?
I'm not sure why you think this should be possible. The jack is a "magjack" as shown in the schematic. There appears to be no DC paths through it.
You can't replace the magjack with a regular jack as …
- 12k
2
votes
Where is my RPi losing power?
On the other hand getting the power in without the polyfuse in the way seems to reduce the number of unexplained crashes. …
- 12k
10
votes
Accepted
HDD without external power is working. Is this dangerous?
Power supply, other periperals, cpu load etc.
The main polyfuse is evil. … If the current is on the high side it could trip after a few hours even if nothing else changes
I don't power mine through the polyfuse anymore. Much more reliable. …
- 12k
8
votes
How many volts can you safely connect to the Pi?
If you remove power from the 6V side while a powered hub is connected for instance - the 7805 will be reversed biased. This is the archilles heal of the 78XX series. …
- 12k
5
votes
Make RPi keep an semi-accurate time after power loss
Have a search on ebay for "i2c rtc"
There are plenty of very inexpensive ones based on the DS1307 battery included!
I've connected one of these previously, but I don't think I posted the code anyw …
- 12k
4
votes
Accepted
Keyboard not working on Raspberry Pi 2 Model B
That type of converter just wires pins to pins. Legacy USB ports are able to notice that it's a PS/2 keyboard and change their behaviour.
The RPi USB port doesn't have the support for the PS/2 comb …
- 12k