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: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Friday, March 06, 2015 1:41 AM To: [email protected] 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 <http://forums.adafruit.com/viewtopic.php?f=8&t=69691&p=353330&sid=eff0f5bd69bba9338e6f0ec2d7fa70c4#p353330> &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 [email protected]. 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 [email protected]. For more options, visit https://groups.google.com/d/optout.
