I'm making my foray into creating a Beaglebone Black based music server. I'm powering the BBB off of a 5v power supply with what I think is enough juice - 800mA. I'm using the 5v power jack which is fed by my supply. When I turn on the unit via the Beaglebone doesn't turn on. I need to pull the barrel plug out and back in again and it powers up. I'm thinking of tacking on a separate power switch on to the BBB itself to see if this resolves the issue. Anyone seen this before and know why it happens?
800mA ??!! really and even if this was remotely capable what of the downstream USB devices
5v 3amp supplies are ten a penny at Goodwill....
or Aliexpress ?
AC DC Adaptor 3V 4.5V 5V 6V 7.5V 9V 12V 2A 2.5A Adjustable Power Adapter 30W Universal Charger Supply For Led Light Strip Lamp|AC/DC Adapters| | - AliExpress
BeagleBoard.org - peripheral
System Reference Manual * beagleboard/beaglebone-black Wiki * GitHub
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Yeah but power consumption is actually way lower. 400 to 500mA tops. I feel like that rating is way overrated.
I'm not using USB. It's Ethernet communication only to a NAS. The cape I'm using feeds i2s and 3v3 to an Acko reclocker. The re-clocker has two isolator chips that are powered by this 3v3 source. Even still it can't be more than 10-15mA consumption. Maybe you're right and it still wants to see more power to initially start. But that doesn't explain why pulling the plug and reinserting it works.
I'm not using USB. It's Ethernet communication only to a NAS. The cape I'm using feeds i2s and 3v3 to an Acko reclocker. The re-clocker has two isolator chips that are powered by this 3v3 source. Even still it can't be more than 10-15mA consumption. Maybe you're right and it still wants to see more power to initially start. But that doesn't explain why pulling the plug and reinserting it works.
Continuous average power supply is not the same as instantaneous demand, especially at start up.
Dude, get over yourself and buy a proper power supply or you can expect to have more "strange" problems like this down the road.
Dude, get over yourself and buy a proper power supply or you can expect to have more "strange" problems like this down the road.
Seems like normal operation. That’s the way I’ve always done it. Mine stays on all the time.
@pixelpusher - normal operation in that you always have to plug in power to BBB even if 5v is applied by power supply?
Nope. I just figured I could leave it plugged in from powered off position. Then use mains off/on switch to turn on 5v supply, which then in turn would turn on BBB.
I'm not sure if mine works that way but it is not recommended to power off like that. After all it is a computer and you wouldn't pull the plug on your computer would you? If I recall the recommended way to shut down is to hold the button down.
Yup that's how I've been powering down. Holding the button. It's more of a powering up thing that I'm still not clear on.
What does your setup look like in terms of power for the BBB? I'm more than willing to drill another hole in my chassis to allow for a separate power supply for the BBB so I can easily remove DC jack.
What does your setup look like in terms of power for the BBB? I'm more than willing to drill another hole in my chassis to allow for a separate power supply for the BBB so I can easily remove DC jack.
I am using the Botic cape from Twisted Pear. It has a breakout for the power button that I run to a chassis momentary switch with a LED. The same thing could probably be done without the cape but I don't know what terminal to use. You could google it.
I think it's P9.9 for power switch to gnd. That's my current plan is to apply an external switch to see if that works. In terms of adding in a different supply I don't have the space inside my chassis, so it'd have to be external if this supply isn't going to cut it.
So I have an update to my issue. I got it solved, but in an unexpected way. I ended up putting an in-line switch between my 5v supply and the BBB. So I turn on mains switch first, then turn on BBB switch and it works. Now the question is why...
Does your PSU actual output any voltage when started on primary side while loaded with BBB? Did you try a different PSU?