EMS side serial implementation discussion and group design!

[AbeFM]

Heh, sorry - I was just thinking that, if the serial code can be run at a decent speed and reliably, more and more sensors could be done with serial communications - making it possibly more robust and accurate. Does it matter? Probably not, but since I'm on a board with people who want to get 1/10th of a percent control over AFR's, I figure why not go for the gold?

[Fred]

http://www.maxim-ic.com/appnotes.cfm/ap ... umber/2141

We are at 1.376% so we should be OK. I had decent serial comms today after messing around for ages I realised that I was misinterpretting the minicom parity display... and had it wrong. Flawless with it set correctly now.

Will do something useful tomorrow and knock out another release with a built in long TODO list :-)

Fred.

[Fred]

She logs :-)

Fred.

[AbeFM]

Lost some sync there in the middle, time from 120 to 0000, did it reset or something? Anyway, it looks like you're spitting data out once a second? Is it much load on the cpu? Is there a thread to ask all these questions in?

Ah, you did reset it on purpose.... Anyway, awesome awesome. Nice to have some real data out!

[Fred]

Did you see this one :



:-)

[jharvey]

Some potentail points of interest. You don't need the max chip for PC serial. I know that EIA 232 specifies the gray region below 0V but I haven't found an application yet where about 3v wasn't already well out of no mans land. Often you can simply use a tansistor to send data. For those that want to be pure of heart, another tequnique is called power robbing. You can tap a little bit of power of the existing 232 line, save it in a cap, then use it to create the - swing when you transmit.

[Fred]

The max chip is already on the TA card though, so no worries even thinking about that really :-) Secondly, for those with a spare bit of cash, the preferred option would be usb > uart directly to the CPU pins bypassing rs232 and all of the problems that it contains. Good info for those on a seriously low budget building their own unit from scratch and not using the TA card though :-)

Fred.