At 21.52 2012.06.11, you wrote: >I'm glad you survived. =20 It looked like it was insulated. :D >Electron wrote: > >> >>Howdy, >> >>I'm finally testing my dirk bike ECU. It worked wonderfully till a point, >>where the engine turned off and didn't want to start anymore. I thought i= t >>was maybe a bad/cold soldering, so I just replaced it with the original a= nd >>didn't bother anymore for that day. >> >>But when back in the lab, the ECU worked! I made a lot of tests and my EC= U >>proved to work absolutely perfectly, even when hammered. ;) So what was i= t >>that made it suddenly stop working? >> >>I immediately recalled where it happened (I even have GPS logs): I was in= a >>dried river bed full of rocks, and a thick gray cable was making impossib= le >>for me to pass. I stopped in front of it, the engine turned off but I tho= ught >>it was just because of carburetion problems (too low idle), etc.. >> >>I noticed it was a very high tension/current cable that fell down from a >>tower. Regardless of that, it felt natural for me to grab it with my hand= , >>raise it, and thus push the bike beyond the obstacle. Then I tried to sta= rt >>the engine but, as said, it didn't run, so (as I wasn't alone and everybo= dy >>was in a hurry) I quickly swapped the ECU with the original, and the engi= ne >>restarted. >> >>I am thinking to return there but it means to do 200 kms alone.. it's not >>safe to do it off road, but thanks to the GPS log I found a way to do 99%= of >>those 200km via asphalt, and I will return there to clear my doubts. >> >>I tried to disturb the ECU in my lab with 230V 2000W appliances, but >>evidently that wasn't enough. I will have to return there, near that cabl= e, >>and see if the fault is repeatable, also because I've been using it for >>many hours today and it worked flawlessly. >> >>But as it's very distant from home, I want to make 1 trip and 2 jobs: I w= ant >>to bring with me a 2nd prototype, with a supposed workaround/fix/improvem= ent >>in place, and see if this new prototype is immune enough to that=20 >terribly noisy >>cable. >> >>Will shielding help? It probably won't, as it's just 50Hz magnetic=20 >field I think, >>but I wish to ask you. >> >>Will placing the Xtal nearer to the MPU help (currently 10mm), as=20 >well as moving >>the Xtal caps to the bottom of the PCB board, so they're as near as=20 >possible to >>the Xtal and MPU too? (currently the caps are on the same PCB side of the= Xtal >>and MPU and are comprehensibly not really close (another 10mm) but,=20 >worse, their >>ground return doesn't go into the MPU Vss pin, but to the opposite side o= f the >>PCB). Can this have made a difference? >> >>What else would you make to ensure maximum immunity to the noise coming f= rom >>a very high tension/current cable that is there although it should=20 >not be there? >> >>It's a chance I have to make my circuit more robust and gain experience b= efore >>they fix that cable (because it can't be there, it's dangerous, and I=20 >will notify >>the local police about it then, i.e. hopefully tomorrow morning already). >> >>Oh yes this time I won't touch it, I will reach it near with my bike=20 >and ECU but >>not grab it anymore. If it was the cause of the malfunction, it=20 >indeed did it even >>at 1 meter of distance, so I'll do it from a small distance. >> >>Cheers, >>Mario >> >>--=20 >>http://www.piclist.com PIC/SX FAQ & list archive >>View/change your membership options at >>http://mailman.mit.edu/mailman/listinfo/piclist > >--=20 >http://www.piclist.com PIC/SX FAQ & list archive >View/change your membership options at >http://mailman.mit.edu/mailman/listinfo/piclist --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .