Pic reset and following lock up problem

[zerosvarka]

Hi Everyone,
Sorry for delay. I have assembled the circuitry as suggested by Acetronics. I was adding one part after the other and checking for any changes. When I run the coil with suppressed resistance type high tension lead (all the modern cars) everything works fine. When I run the coil with old-fashioned copper core high-tension lead or just a wire(cars before 197x) it does not work properly. As soon as the coil fires it resets the Pic and it fires the coil again without delay. Obviously it needs more work. I will carry on and post the results

[zerosvarka]

Hi,
Thanks to this forum I’ve got it working.
I used this thread http://www.picbasic.co.uk/forum/showthread.php?t=11222
So I changed the PIC to 12F683 configured MCLR as an input and used 8MHz internal oscillator. MCLR pin is protected by 5vTVS. I attached circuitry and the code I use. The REFIRE and REFIRE2 allow to hear when reset occurs. I started with suppression lead and resistive sparkplug (they both suppress interference). Then substituted adjustable spark tester (1 cm gap) for spark plug and then removed the suppression lead leaving bare gap (no suppression). When the coil fires it creates quite a strong interference. My laptop screen flickers (laptop just seats on the same table), USB to SERIAL converter locks-up(use it for RS232) and my scope freezes (none of these devices are connected to any circuitry). But the PIC works fine and doesn’t reset .

[zerosvarka]

Sorry for misspell. It should’ve been None of these devices IS connected to any circuitry.

[Archangel]

Hi,
Thanks to this forum I’ve got it working.

Great !

When the coil fires it creates quite a strong interference. My laptop screen flickers (laptop just seats on the same table), USB to SERIAL converter locks-up(use it for RS232) and my scope freezes (none of these devices are connected to any circuitry). But the PIC works fine and doesn’t reset .

Looks like a good demonstration of how EMT weapons work, what is this for ?

Sorry for misspell. It should’ve been None of these devices IS connected to any circuitry.

Depends upon the neighborhood, in my neighborhood, we would say, None of these devices Are connected to, . . .
<br>I used to play with MDS decoders years ago, and what I did was get some brass sheet and build a box, into which; I put the oscillator to shield it. I fed it with feed through capacitors. If you really want to shield your circuit, this is an option.