Question

3. Voltage dividers are often used to reduce larger voltages to smaller voltages that can be readily measured with microcontrollers. For this approach to work, the current through the voltage divider resistors must be the same. Yet some microcontroller analog inputs require non- negligible input current, meaning that the voltage divider output cannot be connected directly to some microcontroller analog inputs. Fortunately, a voltage follower op-amp can be used to interface between a voltage divider and microcontroller input, as the voltage follower requires negligible current from the voltage divider while providing the desired voltage and current to the microcontroller input. For the adjacent circuit assuming an ideal op-amp, calculate the voltage $V_{meas}$ resulting in $V_{out} = 5.00$ V connected to a microcontroller analog input. (Hint: $V_{meas}$ should be between 14 and 15 V.)(2 points.)

          3. Voltage dividers are often used to reduce larger
voltages to smaller voltages that can be readily
measured with microcontrollers. For this
approach to work, the current through the voltage
divider resistors must be the same. Yet some
microcontroller analog inputs require non-
negligible input current, meaning that the voltage
divider output cannot be connected directly to
some microcontroller analog inputs. Fortunately, a
voltage follower op-amp can be used to interface between a voltage divider and
microcontroller input, as the voltage follower requires negligible current from the
voltage divider while providing the desired voltage and current to the microcontroller
input. For the adjacent circuit assuming an ideal op-amp, calculate the voltage $V_{meas}$
resulting in $V_{out} = 5.00$ V connected to a microcontroller analog input. (Hint: $V_{meas}$
should be between 14 and 15 V.)(2 points.)

3. Voltage dividers are often used to reduce larger
voltages to smaller voltages that can be readily
measured with microcontrollers. For this
approach to work, the current through the voltage
divider resistors must be the same. Yet some
microcontroller analog inputs require non-
negligible input current, meaning that the voltage
divider output cannot be connected directly to
some microcontroller analog inputs. Fortunately, a
voltage follower op-amp can be used to interface between a voltage divider and
microcontroller input, as the voltage follower requires negligible current from the
voltage divider while providing the desired voltage and current to the microcontroller
input. For the adjacent circuit assuming an ideal op-amp, calculate the voltage Vmeas
resulting in Vout = 5.00 V connected to a microcontroller analog input. (Hint: Vmeas
should be between 14 and 15 V.)(2 points.)

Added by Lisa H.

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