My requirement is to measure DC voltage in range 20 to 80 using a microcontroller.
Its is stated in the microcontroller datasheet that "The maximum recommended impedance for analog sources is 2.5 kΩ." and the analog input range of the microcontroller is 0-5v.
I am restricted to do this by using voltage divider and op amp. Here scaling down of voltage is done, is it possible to have the gain of op amp less than unity.
I am an absolute beginner so pls provide me a circuit and explain what is the role of op amp (since scale down of voltage can be achieved by voltage divider itself).
Its is stated in the microcontroller datasheet that "The maximum recommended impedance for analog sources is 2.5 kΩ." and the analog input range of the microcontroller is 0-5v.
I am restricted to do this by using voltage divider and op amp. Here scaling down of voltage is done, is it possible to have the gain of op amp less than unity.
I am an absolute beginner so pls provide me a circuit and explain what is the role of op amp (since scale down of voltage can be achieved by voltage divider itself).