Quarry Height

Can someone help me make a program for a framequarry (RP2)?
So that the quarry stops at a certain height, goes back up and moves on to make a new hole.
This is what a got so far:

local y = 74

while y > 8 do
if rs.getInput("front") then
y = y - 1
print(y)
sleep(5)
end
end



Thank you !

You might want to tell us what signals your frame quarry expects, and what they do.

When the redstone from the front of the computer is on it will stop the quarry from digging and going down.
On the right side of the computer is a timer that moves the quarry up. the redstone signal has to be off to move the quarry up.

I hope this is enough information.