Can you explain how that happened? When I measured the gate pin on the FETs, it was only 200mV.
How would this fry the board, and what exactly would it fry on the Bone? On Friday, March 6, 2015 at 5:48:00 PM UTC-8, Wulf Man wrote: > > what you have done is fry the boards by not connecting the ground. > > > > > On 3/6/2015 6:24 PM, gr...@sensa.io <javascript:> 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://ca.linkedin.com/pub/bill-pretty/2b/b07/602 >> >> >> >> >> >> *From:* beagl...@googlegroups.com [mailto:beagl...@googlegroups.com] *On >> Behalf Of *gr...@sensa.io >> *Sent:* Friday, March 06, 2015 1:41 AM >> *To:* beagl...@googlegroups.com >> *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 >> >> *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. >> For more options, visit https://groups.google.com/d/optout. >> ------------------------------ >> >> No virus found in this message. >> Checked by AVG - 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...@googlegroups.com <javascript:>. > 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.
