adc_read()

temtronic · Posted: Mon Sep 19, 2011 4:03 pm

More options...once you've walked away from bashing the wall with your head.....been there,done that a few times....

How about just grabbing 2 breadboards, a 12bit ADC( LTC....), your thermistor, 'some ' PIC, LCD(2x16),cold spray and soldering iron and make a 'test jig' to see if it's the PIC you're using. I've got a couple of these 'minimal systems' (18 pin and 40 pin) to do 'proof of concept' stuff.
The lower breadboard holds the PIC on the left and the LCD on the right, 'peripherals of interest' go on the upper breadboard, typically RS232 MAX488 and Vinculum right now.
Let's face it, if it works on a breaboard, it'll work in a real PCB environment.
Even if you just spend 2 or 3 hours to PROVE you can read an external 12 bit ADC and little, older PIC setup, it's time well spent.

Have you been able to 'twiddle a pot' and read it correctly with your real system? A basic test but would be useful . Maybe start with 8 bit mode, then 10 then 12. Just a simple read adc+show on LCD program, NOTHING fancy. There may be some quirky interaction from some other subsystem, onboard periperal causing you grief. KISS is a great principle!