Statistics: Posted by abecedarian — Mon Jan 05, 2015 12:07 am
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I have done some less constructive boredom prevention. Probably the biggest bang for the buck was when I ignited an exposition. It was heard by a friend inside a gas station 7 miles away. They were at the register, they asked what was that, then walked out side to looked around. When they returned from the beer run, they found a pile of us with out hearing, and suddenly understood what that noise was. I remember standing behind a metal tool box. After the bang, I looked down and noticed both my foot prints about 1 inch in-front of my foot. AKA the shock wave pushed me back an inch while I was standing. We are really lucky that no one got significantly hurt. I guess it's also good we made sure to have ear plugs on hand. If we didn't I'm sure we wouldn't have any hearing at all these days.
So I guess to answer the question, no I never get bored. I always find something to do. and with some planning I can make those things constructive.
Statistics: Posted by kb1gtt — Sun Jan 04, 2015 11:14 pm
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Yes, R1 / R2 are the major heat generators since they are current sense shunt resistors. However, I wanted a short trace lengths to minimize any voltage drop. In retrospect, things should be placed differently since as rendered, the MOSFET is below board, and that resistor is on top so stacking would be impossible.
Maybe worth noting that one LM1949 could fire two high-Z injectors as a batch, meaning only 3 would be needed for a 12 cylinder engine, freeing up some of the DIO for ignition in wasted spark configuration.
But like I queried... do you ever get bored and do things just "because", with no real reason to do so?
I'd like to hear about some of the random musings others have had.
Statistics: Posted by abecedarian — Sun Jan 04, 2015 4:07 pm
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When you say Arduino, I'm assuming you mean https://www.olimex.com/Products/Duino/STM32/OLIMEXINO-STM32/open-source-hardware which include automotive grade power supply and CAN. The problem is that it doesn't play nice with the pin count. If you have 8 fuel and 8 spark, you have gobbled up pretty much all your IO in the header stack. You need more IO for an Arduino for larger numbers of cyls. Or you need a mechanism for linking multiple units.
Statistics: Posted by kb1gtt — Sun Jan 04, 2015 11:03 am
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(Ignition drivers sold separately)
... while trying to figure out what to do about the heat generated in the unit....
Statistics: Posted by abecedarian — Sun Jan 04, 2015 8:31 am
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