Electroman987
New Member
I'm pretty new at electronics but I have some experience. I am using LM339 to determine whether or not certain voltages are 5v or not. I was thinking to connect 5v to the reference (+) side and the measured voltage (-) to the other side. Then as the Vdd, I am connecting 5v again. All of this is going to a basic stamp to be determined as high or low. Do I still need a pull up resistor to have the microcontroller detect it? And if I do, what ohm dose it need to be? Help would be greatly appreciated.
Sincerely,
A student
Sincerely,
A student