5 ms·

I like the barrel jack for power on the development kit version, I wonder what sort of power requirements it has as that seems to be an issue with the RPiS. On

I like the barrel jack for power on the development kit version, I wonder what sort of power requirements it has as that seems to be an issue with the RPiS. On a side note that is a very impressive heatsink too!

godelski 8y ago
What problems are you facing on the pi? The USB power to me is a big win. I already have a ton of cables sitting around.
- dustindiamond 8y ago
  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.
- sigmaprimus 8y ago
  My biggest problem is more of a mechanical issue, the darn micro USB connector is difficult to align and after a while of plugging in and out(especially due to being difficult to quickly see if it's right side up) it becomes loose. As far as power itself, I have only run into catastrophic problems when attempting to use a hand held solar powered battery backup bank and when I tried to use a car cigarette lighter USB adapter. That being said it is my understanding that RPIS use a special power management scheme that actually throttles the processor cycles without any indicator, including the lightning bolt so maybe that laggyness could be power issues too? (Edit: There might be an iindicator of the low power throttle in the kernel log)
  - lunchables 8y ago
    I actually bought some small micro usb power dongles with switches on them. So you only plug it into the pi once, then plug the dongle into the actual power source. Also means you can turn it on/off without being forced to pull the plug. Something like this: https://smile.amazon.com/LoveRPi-MicroUSB-Switch-Raspberry-Female/dp/B018BFWLRU https://smile.amazon.com/LoveRPi-MicroUSB-Switch-Raspberry-F...
    - godelski 8y ago
      I just unplug it from the wall...
      - lunchables 8y ago
        Unfortunately for me a lot of times that requires digging behind a piece of furniture :)

godelski 8y ago

What problems are you facing on the pi? The USB power to me is a big win. I already have a ton of cables sitting around.

dustindiamond 8y ago
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.
sigmaprimus 8y ago
My biggest problem is more of a mechanical issue, the darn micro USB connector is difficult to align and after a while of plugging in and out(especially due to being difficult to quickly see if it's right side up) it becomes loose. As far as power itself, I have only run into catastrophic problems when attempting to use a hand held solar powered battery backup bank and when I tried to use a car cigarette lighter USB adapter. That being said it is my understanding that RPIS use a special power management scheme that actually throttles the processor cycles without any indicator, including the lightning bolt so maybe that laggyness could be power issues too? (Edit: There might be an iindicator of the low power throttle in the kernel log)
- lunchables 8y ago
  I actually bought some small micro usb power dongles with switches on them. So you only plug it into the pi once, then plug the dongle into the actual power source. Also means you can turn it on/off without being forced to pull the plug. Something like this: https://smile.amazon.com/LoveRPi-MicroUSB-Switch-Raspberry-Female/dp/B018BFWLRU https://smile.amazon.com/LoveRPi-MicroUSB-Switch-Raspberry-F...
  - godelski 8y ago
    I just unplug it from the wall...
    - lunchables 8y ago
      Unfortunately for me a lot of times that requires digging behind a piece of furniture :)