4 ms·

Pi needs way more than 500ma, which a USB 2 port maxes out at, I think. I think a pi3 needs at least 2 or 3 amps.

godelski 8y ago
Most phone chargers now are 1.5-2A standard... My first pi (a B, not a B+, gen 1) it was pretty common for phone chargers to be 1A. I still remember over clocking it no problem. Just looking at the 3 chargers sitting next to me they are 3A (phone), 1A (tablet) and 1.6A (IDK, probably a phone). I've had all these for several years (you can probably guess the order). I think I'd be hard pressed to find one that was <1A in my house. 1A chargers are considered "slow" now. For reference, documentation says Pi3 B needs 700mA - 1A[0] depending on peripherals (they recommend 2.5A, but that's hogwash). To match my experience, I've run B+'s overclocked (and overvolted) with a camera (+250mA) no problem with a 1.5A charger. If I remove the camera they run fine with a 1A charger (so we have a kind of bound there for "typical" usage +/- error in charger). They boot loop with the camera and a 1A charger. So I'm a little confused by your statement. I've only ever run into a power problem once. And that was a few years ago when I was pushing the pi's CPU/GPU, adding a camera (doing object detection), and using an old USB charger. Swapped that out and problem solved. I'm not saying that your problem doesn't exist, I just don't really understand how you see it as a problem and what your statement has to do with it. You're also not quite right about power outputs[1], which let's be honest; do you think your phone charges at 500mA? Your numbers are for signal, not power (though I get the easy confusion). 500mA is like what you'd get from plugging it into the computer, not a charger. It isn't the cable that controls the power^, it is the supply. I for one rather like only needing one cable for everything. [0] https://www.raspberrypi.org/documentation/hardware/raspberrypi/power/README.md https://www.raspberrypi.org/documentation/hardware/raspberry... [1] https://en.wikipedia.org/wiki/USB#Power-related_specifications https://en.wikipedia.org/wiki/USB#Power-related_specificatio... ^ Well... wire gauges have limits and you can burn up the wire. But you're going to be pretty hard pressed to find a supply that accepts a USB and will also output enough power to burn the cable.
- dustindiamond 8y ago
  I never said anything about a phone charger. Are you confused who you are replying to?
  - sigmaprimus 8y ago
    Maybe the reply was meant for me? Maybe it's just me but because there is no off switch on a Rpi I am constantly plugging and unplugging it, I have found the receiver or female part of the connector on the board tends to get loose from that, that is where the loss of power seems to be coming from, I have run into this issue with my BLU amazon phone also. I'm just not a fan of the micro USB connector I guess, but maybe it's just me and no one else has thus problem.
    - dustindiamond 8y ago
      I shut it down via the commandline, but, that doesn’t really solve turning it on.
    - sigmaprimus 8y ago
      Actually I don't know if it is just cheap cables, I am not sure if it is the male or the female part of the connection that is degrading. The next time I get into town I am going to purchase a "Premium" USB to micro cable and a new PSU and will see if that solves my issue. I am concerned that my past ebay and dollar store purchases may have corrupted my stock of cables with factory 2nds and rejects.
  - godelski 8y ago
    I'm replying to you because I don't know why you're bringing up USB power requirements as an issue.

Most phone chargers now are 1.5-2A standard... My first pi (a B, not a B+, gen 1) it was pretty common for phone chargers to be 1A. I still remember over clocking it no problem. Just looking at the 3 chargers sitting next to me they are 3A (phone), 1A (tablet) and 1.6A (IDK, probably a phone). I've had all these for several years (you can probably guess the order). I think I'd be hard pressed to find one that was <1A in my house. 1A chargers are considered "slow" now. For reference, documentation says Pi3 B needs 700mA - 1A[0] depending on peripherals (they recommend 2.5A, but that's hogwash). To match my experience, I've run B+'s overclocked (and overvolted) with a camera (+250mA) no problem with a 1.5A charger. If I remove the camera they run fine with a 1A charger (so we have a kind of bound there for "typical" usage +/- error in charger). They boot loop with the camera and a 1A charger. So I'm a little confused by your statement. I've only ever run into a power problem once. And that was a few years ago when I was pushing the pi's CPU/GPU, adding a camera (doing object detection), and using an old USB charger. Swapped that out and problem solved. I'm not saying that your problem doesn't exist, I just don't really understand how you see it as a problem and what your statement has to do with it. You're also not quite right about power outputs[1], which let's be honest; do you think your phone charges at 500mA? Your numbers are for signal, not power (though I get the easy confusion). 500mA is like what you'd get from plugging it into the computer, not a charger. It isn't the cable that controls the power^, it is the supply. I for one rather like only needing one cable for everything. [0] https://www.raspberrypi.org/documentation/hardware/raspberrypi/power/README.md https://www.raspberrypi.org/documentation/hardware/raspberry... [1] https://en.wikipedia.org/wiki/USB#Power-related_specifications https://en.wikipedia.org/wiki/USB#Power-related_specificatio... ^ Well... wire gauges have limits and you can burn up the wire. But you're going to be pretty hard pressed to find a supply that accepts a USB and will also output enough power to burn the cable.

dustindiamond 8y ago
I never said anything about a phone charger. Are you confused who you are replying to?
- sigmaprimus 8y ago
  Maybe the reply was meant for me? Maybe it's just me but because there is no off switch on a Rpi I am constantly plugging and unplugging it, I have found the receiver or female part of the connector on the board tends to get loose from that, that is where the loss of power seems to be coming from, I have run into this issue with my BLU amazon phone also. I'm just not a fan of the micro USB connector I guess, but maybe it's just me and no one else has thus problem.
  - dustindiamond 8y ago
    I shut it down via the commandline, but, that doesn’t really solve turning it on.
  - sigmaprimus 8y ago
    Actually I don't know if it is just cheap cables, I am not sure if it is the male or the female part of the connection that is degrading. The next time I get into town I am going to purchase a "Premium" USB to micro cable and a new PSU and will see if that solves my issue. I am concerned that my past ebay and dollar store purchases may have corrupted my stock of cables with factory 2nds and rejects.
- godelski 8y ago
  I'm replying to you because I don't know why you're bringing up USB power requirements as an issue.