Knock sensing with current hardware?

4600cc · Post by **4600cc** » Wed Dec 14, 2005 11:12 pm

http://www.megasquirt.info/ms2/knock.htm

I wonder if megajolt can accept that GM knock unit? Forget about the firmware, if it can be connected to megajolt and input can be read, then firmware will eventually be made to use it.

AL

Post by **brentp** » Thu Dec 15, 2005 12:54 am

There is a purposely unused "aux" input on the V3 board, which ties into one of the processor pins. So it conceiveably should be possible with some extra firware code to integrate something like this.

4600cc · Post by **4600cc** » Thu Dec 15, 2005 10:35 am

Can the previous version of the board (V2?) be modified to have that aux input?

Post by **brentp** » Thu Dec 15, 2005 4:47 pm

Yes, it can. What I do on the V3 board is just bring out that unused pin and clamp it with a 5V Zener. Mostly a convenience thing.

4600cc · Post by **4600cc** » Thu Dec 15, 2005 11:22 pm

Aye aye chief. When I get to knock sensing I'll ask you more.