Perhaps you missed the point of my post. That one in your link uses HUGE I mean gigantic amounts of power.
No, it's quite low power.
Those dot matrix diplay will eat a battery in no time and a processor running 4MHz is hungry too.
It uses a low power consumption LCD text module, and PIC's are extremely low power consumption.
Mine was posted as a frequency counter that works and is low power and simple. Now if he had done his with a much lower crystal frequency and used an LCD display (7 segment) then it would be more impressive. Let's face it. In todays electronics we are competing with cheaply made Chinese junk. And low power is the name of the game.
You mean like the link I posted?.
But the point of the link was the front end, as an example of how it could be done even on such an ancient design.