hello
i am trying to make a pic detect a small voltage change 0.2v to 0.6 volt
not measure it , just detect its change
i have to use 16f628, anything else is not an option
any suggestions ?
Check out the comparator and voltage reference sections of the data sheet. You can set Vref to 5/24 * 2 = 0.4V and use a comparator to detect if the other input is above or below it.
I think it is better to amplify the voltage 10 times using low noise operational amplifier such as TLO71 to get greater ampltude and and then use a window comparator to detect the change of the voltage
I think it is better to amplify the voltage 10 times using low noise operational amplifier such as TLO71 to get greater ampltude and and then use a window comparator to detect the change of the voltage
Regardless of amplifying it or not, it makes obvious sense to use the internal comparators in the PIC - there's also no requirement for a window comparator, as he's not looking to detect a 'window', just above or below a certain value.