Jon Wilder
Active Member
Hi all. Currently I'm working on making a digital tachometer. I have most of the code working off of a synthesized "tach signal". I'm designing a comparator input circuit that will translate any tach signal into a 5V square wave equivalent.
I'm doing all of this on a 18F46K22, but I'm thinking that it's way overkill of a processor for this application and may go with something a bit smaller. Clearly this application doesn't need a 40-pin processor...can probably get away with an 18-pin device easily. I'll need at least 7 pins for the LCD display, one of them with PWM available for LCD contrast, and 1 for the tach signal input.
In terms of available on-chip hardware, at what point do you consider a processor to be too much processor for the application?
I'm doing all of this on a 18F46K22, but I'm thinking that it's way overkill of a processor for this application and may go with something a bit smaller. Clearly this application doesn't need a 40-pin processor...can probably get away with an 18-pin device easily. I'll need at least 7 pins for the LCD display, one of them with PWM available for LCD contrast, and 1 for the tach signal input.
In terms of available on-chip hardware, at what point do you consider a processor to be too much processor for the application?