John Morley wrote:Alex,
Is not quite solved yet but I have to put the GPS down for a while. Most of the testing I've done has been by my window, and sometimes I get a lock and others I don't., so I don't know if the trouble I'm having is a combination of issues like you mention before.
The original plan was to log GPS data, engine rpm, throttle position and air fuel ratio on my race bike before race day an the end of October, so now I'm out of time to mess with the GPS and start preparing the bike.
I thought I was going to be able to pull it together with in 2 weeks time, but my ambition exceeded my ability. My background is mechanical, though I do quite a bit of coding, I though this project was going to be a breeze. My electrical skills are not so good either, so when I don't understand something, which is mostly everything, I have to do quite a bit of reading before I understand enough and continue troubleshooting. Now that I ditched the GPS and I'm only running netduino, I was able to calculate RPM from the pulse that goes to the gauges and the voltage coming from the air fuel ratio sensor, but when I connect them together, the voltage from the air fuel ratio sensor is different. I did split the voltage to get it down from 10v to 3.3v, but now I don't know if the pulse is throung the rest of the circuit voltage off.
So you see, I need to put this project down and prepare the bike. This is the last race of the season and I'm after some money so I need to have the bike in optimal conditions. Unfortunetly, this project was going to help me achieve that by logging air fuel ratio, so at the end is not going to be perfect but is all I can do for now. I will rethink this project during the winter time, or I just may buy a system already developed.
I want to thank you for your help figuring out the GPS, is the first time I do this and you help was appreciated.