To power up the BBB from OFF when powered from the 5 v jack, I have to press the power button.
To power up using the mini-usb connector, all I have to do is turn on the USB power.
My question is this. Is there a way to have the BBB automatically power up when power is applied to the +5 jack?
now I am confused because I thought it was normal procedure to hold the power button after inserting the 5V jack. (as noted by Richard-tx)
I always have to hold the power button after inserting the jack. When I insert the jack, I see a brief blue light from the pwr LED next to the 5V connector and then nothing. If I hold the power button it boots. - every time.
Booting the Board
As soon as the power is applied to the board, it will start the booting up process.
When the board starts to boot the LEDs will come on in sequence as shown in Figure
15 below. It will take a few seconds for the status LEDs to come on, so be patient.
The LEDs will be flashing in an erratic manner as it boots the Linux kernel.
It is not the end of the world for me, but just interested all the same.
The beaglebone had a power up issue. Rev A6A fixed it:
From the wiki: “Changed C24 to a 2.2uF capacitor. This extends the reset signal to solve an issue where some boards would not boot on power up.”
I have around 40 beaglebones running and this was a pretty serious problem for us. Our users guides have a somewhat embarrassing “If the board doesn’t boot, unplug the power and wait 10 seconds.” I have around 20 Rev. B boards, and I haven’t seen one fail to power up.
when RO is Low (RO is switched internaly with tranzistor to ground) 3.3V from R1 is Grounded and RXD is Low
when RO is High, 5V from IC is blocked by diode and RXD side is 3.3V High from R1