Amin Moinez
Newbie level 4
i'm new to pic18f4580 microcontroller and currently doing digital ohm meter problem. by any chance, can u guys help me?? i'm totally clueless about the program that needed to do
I have build the circuit but don't know whether it is correct or not. Second problem is how i need to connect my constant current source and what type circuit to be used. lastly about my c language programWelcome to the forum Amin!
It's not exactly clear what you're trying to build, so you'll have to elaborate on that before we can give you any useful advice. Where exactly are you stuck?
thanks but if you can provide example it will be more helpful. Thank you very much. I'm totally new in pic18f4580 but have basic using c languagefirst form the circuit using some op amps and measure voltage output of op amp using pic controller keep one resistance as unknown value and remaining resistor as known value by using op amp equation you will find the unknown resistance value easily
What is the range of your measurement
Ohms, milliohms, Kohms,Mohms ?
for current source minimum at least 1mA is enough. The measured ohm ranging from 100 - 10k ohm. I'm doing pic18f4580 microcontroller and 10bits ADC 16x2. For pic I only using pic18f4580. If you have an example it'll be more helpful.hello
Give some answer if you want further help...
for example , if you have a current source of 1mA..maximum measure in ohm, will be 5000 ohms
with an ADC 10 bits 5V
some MCU like 18F46K22 have current source possibility, adjust by software ....
i gave you another way
RC Time measure ...