i am using pic microcontroller and i have connect 12V DC (150mA)signals to the inputs. Since, microcontroller input pins are CMOS logic and cannot sink more than 20mA so i have used ULN2003.
the 12V inputs are connected to the input of ULN and the output of ULN are connected to microcontroller input through a pull up registor.
i need isolation between 12V and microcontroller. does ULN provide any isolation??
the best solution was to use optocouplers but they are very costly.
is buffer a good solution insted of ULN?
please give your views on this.....
best regards,
Manjunath