I guess that connecting a load of F/V convertors to analogue ports will be easy to understand conceptually, but I wonder if you have considered that you could remain digital and sample multiple ports using a simple switching circuit and a couple of digital i/o control lines.
If you were to say connect the timer counter channel line to the output of a CD4051B (pin 3) and connect three digital i/o lines to the CD4051B (pins 11,10 and 9) you could handle eight channels, all digital as required. Lower chip count, no analogue set up or calibration required and only a couple of nominal value pull up resistors to get it all to hang together.
Analogue F/V's are not 'instantaneous' and require calibration, as well as being prone to temperature effects and component tolerances.
It's just a differnet view point. 🙂
Any thoughts?
