Hi all,
I have a Seeeduino Mega that I am powering externally, but I also have the USB cable attached. The problem is that I would like to be able to turn off my Mega without also needing to remove the USB cable. (There is a long-winded reason for this...)
I loved the jumper on the Diecimila that manually selected it, but this auto-select on the mega is a little annoying IMHO.
Can such a thing be done?
Thanks,
Craig.
cmroanirgo:
Hi all,I have a Seeeduino Mega that I am powering externally, but I also have the USB cable attached. The problem is that I would like to be able to turn off my Mega without also needing to remove the USB cable. (There is a long-winded reason for this...)
I loved the jumper on the Diecimila that manually selected it, but this auto-select on the mega is a little annoying IMHO.
Can such a thing be done?
Thanks,
Craig.
I have a Seeeduino mega board also, it's a great little board. However it does not have any auto-voltage circuitry, rather it has a manual two position switch that you operate to select either USB or external connector power. If you using only a single voltage source, USB or EXT, then that switch also operates as a simple power on/off switch by switching to the unused voltage position. However if you have both external power connected and connected to a PC, then there is no power off possible with that manual switch.
So if you are always going to have external power wired to the board, the only way I see to power off the board is to leave the manual voltage selection switch in the external voltage position and then wire a on/off switch in series with the external voltage source prior to where it plugs into the Seeeduino mega board.
Lefty
Lefty,
What you describe is exactly what I need, but call me crazy...
I simply don't see what you're mentioning. There's a 3.3v/5.0v switch, there's a Manual/Automatic Reset switch and then there's the reset button...
I have board v1.22 and looks exactly like the one shown over on seeedstudio http://www.seeedstudio.com/depot/seeeduino-mega-p-717.html
cmroanirgo:
Lefty,What you describe is exactly what I need, but call me crazy...
I simply don't see what you're mentioning. There's a 3.3v/5.0v switch, there's a Manual/Automatic Reset switch and then there's the reset button...I have board v1.22 and looks exactly like the one shown over on seeedstudio http://www.seeedstudio.com/depot/seeeduino-mega-p-717.html
Ah, I have the older v1.0 board, and it has three slide switches and one reset switch. I wasn't aware of their upgrade to a new design, replacing the manual voltage select switch with a auto swithing voltage selector. I guess sometimes progress is not an improvement? 
Thanks Lefty,
Anyone else know if there's a solution to this?