EnergyWatcher.lua

local rsSide = "top"
local cellSide = "left"
local maxPercent = 95
local minPercent = 20
local cell = peripheral.wrap(cellSide)
if not cell then
  error("No energy cell or it's side is wrong!")
end
local max = cell.getRFCapacity()
local shutoff = math.floor(max - (max * (100 - maxPercent) * 0.01))
local startup = math.floor(max * minPercent * 0.01)
print(shutoff, startup)
local on = true
local last = 0
local time = 1
local olds = {}


local function createTimeString(dif, c)
  local tString = ""
  local t2 = ""
  local ts
  if dif > 0 then
    tString = tString .. "shutoff: "
    ts = math.abs(math.floor((shutoff - c) / dif * time))
  elseif dif < 0 then
    tString = tString .. "startup: "
    ts = math.abs(math.floor((c - startup) / math.abs(dif) * time))
  else
    tString = "Idle"
  end
  if dif ~= 0 then
    local tm = math.floor(ts / 60)
    ts = ts - (60 * tm)
    local th = math.floor(tm / 60)
    tm = tm - (60 * th)
    tString = tString .. tostring(th) .. "h, " .. tostring(tm) .. "m, " .. tostring(ts) .. "s"
  end
  return tString
end

local function addToOlds(n)
  if #olds > 8 then
    table.remove(olds, 1)
  end
  table.insert(olds, n)
end

local function average(inp)
  local ttl = 0
  local sz = #inp
  for i = 1, sz do
    ttl = ttl + inp[i]
  end
  ttl = ttl / sz
  return ttl
end


while true do
  local c = cell.getRFStored()
  local dif = c - last
  last = c
  addToOlds(dif)

  if c < startup then
    on = true
  elseif c > shutoff then
    on = false
  end
  term.clear()
  term.setCursorPos(1,1)
  print(tostring(c), "/", max)
  print(tostring(startup) .. " / " .. tostring(shutoff) .. " (startup/shutoff)")
  print(on and "Generators running" or "Generators offline")
  print()
  print(dif < 0 and tostring(math.abs(dif)) .. " v RF/s" or dif == 0
        and "0 - RF/s" or tostring(dif) .. " ^ RF/s")
  print()
  print(tostring(math.floor(dif / (time * 20))) .. " RF/t")
  print()
  print("Average: " .. tostring(math.floor(average(olds) / (time * 20)))
        .. " RF/t")
  print()
  print(createTimeString(average(olds), c))
  rs.setOutput(rsSide,on)
  os.sleep(time)
end