Solar Generator Controller

local lightLevel = 4   -- when to transmit
local genSide = "left" -- side generator is touching
local senSide = "top"  -- side sensor is touching

local gen = peripheral.wrap(genSide)
if gen == nil then
  print("Place computer next to generator")
  return
end
local transmitting = false

term.clear()
while true do
  -- check status of generator
  local energy = gen.getEnergyStored(genSide)
  local max = gen.getMaxEnergyStored(genSide)
  -- switch modes
  if transmitting == false
      and (energy >= max
      or rs.getAnalogInput(senSide) <= lightLevel) then
    rs.setAnalogOutput(genSide, 15)
    transmitting = true
  elseif transmitting
      and energy <= 0 then
    rs.setAnalogOutput(genSide, 0)
    transmitting = false
  end
  term.setCursorPos(1, 1)
  print(string.format("Energy  : %6d     \nDaylight: %2d \nTransmit: %s ",
      energy, rs.getAnalogInput(senSide), tostring(transmitting)))
  sleep(10)
end