If I assume that the ground on the circuit didn't have a connection to the BBB ground
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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
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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
Nothing to assume :-) , there is NO ground connection between the BB and the bread board from what the picture shows, just 3 wires (Red, Green, Blue) not 4.
Also, I believe the RasPi uses 5V logic while the BBB uses 3.3V logic /IO
"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
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