Boomslang, that really looks good.
What do you pay for it, and where do you buy it in SA?
I bought it from the site in the link.
5Hz, that's like every 200ms. No wonder your PIC struggles to keep up.
That's why I am using 2 PIC's and a math co-precessor.
I always thought 1sec interval should be fine.
1Hz should be fine for showing the speed in the car, but too slow for what I want to do.
I'm not so much interested in altitude, but could be fun to show the driver how high above sea level he is
Yes, that would make a neet "show" feature.
I also want to include cab temperature in my little system, should be fun.
I've only used thermistors before, they are very accurate if you calibrate them properly.
The thing is sampling revs and speed from the gearbox can be tricky, speed can by from 0Hz to about 150Hz, not a real biggie.
The revs is a different ball game, 0Hz to about 900Hz. All square wave.
I doubt that everything will be handled by one PIC.
Reading the signals by using interrupts should be OK for one PIC to handle