basic analog and digital chp 5 challenge #4

japer

i need a little calification on the challenge
Using the schematic on figure 4-8 in chapter 4

lead #2 is connected to Dac output Note: did chall 1-3
jump to ---- "Vin" ADC0831
is this correct ?
if so , it really need to be toggled with a button
right?

any help would be helpful
japer