EnergyManager

modem = peripheral.wrap("left")
treeoil = peripheral.wrap("back")
rosin = peripheral.wrap("right")

modem.open(3)
os.startTimer(10)

treeoil_on = true
rosin_on = false
steam_percentage = 0

rs.setOutput("back", treeoil_on)
rs.setOutput("right", not treeoil_on)

function toString(bool)
  return bool and "on" or "off"
end

function set(treeoil, rosin)
  print(toString(treeoil) .. " " .. toString(rosin))
  treeoil_on = treeoil
  rosin_on = rosin
  rs.setOutput("back", treeoil_on)
  rs.setOutput("right", rosin_on)
end

function getPercentage(device)
  return math.floor(100 * (device.getEnergyStored() or 0) / device.getRFCapacity())
end

set(true, false)

while true do
  e, r1, r2, r3, r4 = os.pullEvent()
  if e == "modem_message" or e == "timer" then
    if e == "modem_message" then
      steam_percentage = tonumber(r4)
    elseif e == "timer" then
      os.startTimer(11)
    end

    percentage = getPercentage(rosin)
    if steam_percentage > 90 and (treeoil_on or rosin_on) then
      steam_percentage = tonumber(r4)
      set(false, false)
    elseif (steam_percentage < 10 and not (treeoil_on or rosin_on)) or treeoil_on or rosin_on then
      if percentage > 60 then
        set(false, true)
      else
        set(true, false)
      end
    end
  end
end