Edited againn

Miner receiving
rednet.open("right")
i = 0
while true do
event, par1, par2 = os.pullEvent("rednet_message")
repeat
event, par1, par2 = os.pullEvent("rednet_message")
turtle.dig()
turtle.forward()
turtle.digUp()
turtle.turnLeft()
turtle.dig()
turtle.up()
turtle.dig()
turtle.turnRight()
turtle.turnRight()
turtle.dig()
turtle.down()
turtle.dig()
turtle.turnLeft()
i = i+ 1
until par2=="stop"
print("Program ended by user")
for b = 1,2 do turtle.turnLeft() end
for c = 1,i do turtle.forward() end
for z = 1,2 do turtle.turnRight() end
i = 0
end


computer sending information

rednet.open("left")
if redstone.getInput("back") == true then
while signal == "true" do
rednet.send(3,"go")
signal = restone.getInput("back")
end
end
rednet.send(3,"stop")