what you have done is fry the boards by not connecting the ground.
On 3/6/2015 6:24 PM, g...@sensa.io wrote: > Sure, thanks a lot for the continued help. > > Here are the FETs that I used, which are N-Channel and can switch > 30V/60A: https://www.adafruit.com/products/355 > > Here is the wiring I followed (diagram about half way down; first one > that doesn't have the 100-220ohm > resistors): https://learn.adafruit.com/rgb-led-strips/usage > Except I connected the voltage wire on the LED strip to a separate 12V > supply, and did not ground the circuit to the Beaglebone GND as you > can see in the picture I posted on the Adafruit forum. They say at the > bottom there in regards to connecting to separate 12V supply, "Make > sure to connect the ground of that supply to the ground of the > Arduino/MOSFETs!", but in the forum post, they implied it wouldn't > burn out the board if I didn't do this. > > Here is the schematic of the LED > strip: https://learn.adafruit.com/rgb-led-strips/schematic > > > > > On Friday, March 6, 2015 at 5:10:59 PM UTC-8, William Pretty Security > wrote: > > First of all, the output level from the GPIO is about 3.3V and > MOSFETs are voltage controlled devices. > > So you will need a transistor to boost the voltage to 12 volts. > > > > Second: Do you have an actual schematic? > > > > Third: Are you using P or N Channel MOSFET’s ? > > Because high current versions like the ones you are using have a > built in body diode … > > > > Get back to us with more info, Ok > > > > "No one could make a greater mistake than he who did nothing > because he could do only a little." > > "All that is necessary for the triumph of evil is that good men do > nothing" Edmond Burke /(1729 - 1797)/ > > > http://www.packtpub.com/building-a-home-security-system-with-beaglebone/book > > <http://www.packtpub.com/building-a-home-security-system-with-beaglebone/book> > > http://ca.linkedin.com/pub/bill-pretty/2b/b07/602 > <http://ca.linkedin.com/pub/bill-pretty/2b/b07/602> > > > > > > *From:*beagl...@googlegroups.com <javascript:> > [mailto:beagl...@googlegroups.com <javascript:>] *On Behalf Of > *gr...@sensa.io <javascript:> > *Sent:* Friday, March 06, 2015 1:41 AM > *To:* beagl...@googlegroups.com <javascript:> > *Subject:* [beagleboard] BeagleBone Black won't boot after wiring > up LED strip w MOSFETs and separate 12V power supply > > > > I wired up a circuit with an LED strip, 3 N-channel MOSFETs, and a > separate 12V power supply, with the gate pins on the MOSFETS > connected to I/O pins on the Beaglebone. > > > > When I didn't connect the circuit to the Bone ground, I apparently > fried 2 boards. Neither will boot up. One gives a flicker on the > power light and then goes off, and on the other the power light > turns on, but the other LEDs don't flash and I can't get into > either board. > > > > Here is the thread on the Adafruit forum with a photo of the > circuit: > > http://forums.adafruit.com/viewtopic.php?f=8&t=69691&p=353330&sid=eff0f5bd69bba9338e6f0ec2d7fa70c4#p353330 > > <http://forums.adafruit.com/viewtopic.php?f=8&t=69691&p=353330&sid=eff0f5bd69bba9338e6f0ec2d7fa70c4#p353330> > > *The Adafruit support said that setup should not have hurt the > board. * > > > > I checked the voltage on the gate pin on each MOSFET that was > connected to the Bone and it was nominal (~200mA). > > > > Does anyone have any ideas on this? How could this have fried 2 > boards? > > > Thanks for any help. > > > > And PS I posted this earlier today but didn't see it show up in > the forum. Sorry if it needed to be approved and you are getting a > duplicate. > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google > Groups "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, > send an email to beagleboard...@googlegroups.com <javascript:>. > For more options, visit https://groups.google.com/d/optout > <https://groups.google.com/d/optout>. > > ------------------------------------------------------------------------ > > No virus found in this message. > Checked by AVG - www.avg.com <http://www.avg.com> > Version: 2015.0.5646 / Virus Database: 4299/9212 - Release Date: > 03/02/15 > > -- > For more options, visit http://beagleboard.org/discuss > --- > You received this message because you are subscribed to the Google > Groups "BeagleBoard" group. > To unsubscribe from this group and stop receiving emails from it, send > an email to beagleboard+unsubscr...@googlegroups.com > <mailto:beagleboard+unsubscr...@googlegroups.com>. > For more options, visit https://groups.google.com/d/optout. -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
