ComputerCraft pulser

-- A simple pulser, better than having a Redpower timer ticking away every 0.3 seconds!
-- Just change the following line to suit your set up...

side="left"
delay=0.3

while true do
  rs.setOutput(side,true)
  os.sleep(delay)
  rs.setOutput(side,false)
  os.sleep(delay)
end