Reading a speed sensor best method?

[Jumper]

Hi,

If you plan to change from the 877A to something else I recommend 18F4620 (which is also pin-compatible). That will give you 64K Flash and alot more RAM. The only reason the 452 would be an option is if you cant get the 4620.

Do not worry about changing from the 877A, the 4620 is still easy to handle and has multiple INT inputs that you will find really useful.

[Art]

I have had a 16F877A (@4MHz) working in a hot car cab for two months without a reset. That is a plug for the hardware.

Some of the goodies that come with basic block execution of your program (and PULSIN will be one of them) where interrupts will not.
All I can say is search for Darrel Taylor instant interrupts or study Microchip datasheets to do it yourself, (but you'll probably need an example anyway).
The effect a bit like multitasking, your program does not appear to be held up while pulses are being counted.

[davewanna]

Jumper: Thanks for the info on the 4620, looks like the 452 will do, but the 4620 will be better.

Art: I had a quick look at your projects, and you might be interested to know this auto controller is actually in a Surf. And I am doing a digital speedo type of arrangement for my hilux ute also, except instead of numbers, I am using the motors out of a motorcycle dash to move the factory needles.

I will look through your other projects later.

Thanks!

Dave