Q.17 (4 pnts): A potentiometer is wired as given below. What value of RA will ensure that the wiper voltage may equal 1.8 V without exceeding it? 7.5V RA 20k ADC1 1 GND Q.18 (3 pnts): Two pushbuttons are wired as shown below. Complete the truth table for the operation on the right. What effective logic operation is being performed on the two pushbuttons? You may answer using either (a) The name or symbol of the specific logic operation(s) or (b) the equivelant hardware logic gate drawing. Note that for the pushbuttons, 'T' is pressed and F' is not pressed. PB1 Pressed? PB2 Pressed? State of P2.3 F F +5V +5V F PB? PB? F T P2.3 GND Operation: Q.19 (3 pnts): 8 LEDs are wired as typically done in the labs to Port 3. The LEDs are initially lit MSb to LSD: ON OFF ON OFF OFF ON OFF ON. What will the pattern be after executing P3 = P3 >> 2;? Q.20 (2 pnts): True or False: Using int8_t ADCresult; it is possible to convert a negative voltage on ADC1 with ADCresult=ADC1; Q.17 (4 pnts): A potentiometer is wired as given below. What value of RA will ensure that the wiper voltage may equal 1.8 V without exceeding it? 7.5V RA 20k ADC1 1 GND Q.18 (3 pnts): Two pushbuttons are wired as shown below. Complete the truth table for the operation on the right. What effective logic operation is being performed on the two pushbuttons? You may answer using either (a) The name or symbol of the specific logic operation(s) or (b) the equivelant hardware logic gate drawing. Note that for the pushbuttons, 'T' is pressed and F' is not pressed. PB1 Pressed? PB2 Pressed? State of P2.3 F F +5V +5V F PB? PB? F T P2.3 GND Operation: Q.19 (3 pnts): 8 LEDs are wired as typically done in the labs to Port 3. The LEDs are initially lit MSb to LSD: ON OFF ON OFF OFF ON OFF ON. What will the pattern be after executing P3 = P3 >> 2;? Q.20 (2 pnts): True or False: Using int8_t ADCresult; it is possible to convert a negative voltage on ADC1 with ADCresult=ADC1