p = peripheral.wrap("back")
local monitor = peripheral.wrap("top")

while true do
  x = p.getPressure()

  monitor.setTextScale(0.5)
  monitor.setCursorPos(1,1)
  monitor.write("Current Pressure:")
  monitor.setCursorPos(1,2)
  monitor.write(string.format("%.1x", x)
  sleep(1)
  monitor.clear()
  monitor.setCursorPos(1,1)

  if x > 3 then
     rs.setOutput("right",false)
  else
    rs.setOutput("right",true)
  end
end