Sample of my code

os.loadAPI("buttonAPI")

page1=buttonAPI.new()
page2=buttonAPI.new()

reactorTemp = 600
rotorSpeed = 1800

info = {}
t = {}
m = {}
r = {}
c = {}

function getDevices()
  for _, name in pairs(peripheral.getNames()) do
    if peripheral.getType(name) == "BigReactors-Turbine" then
      table.insert(t, peripheral.wrap(name))
    elseif peripheral.getType(name) == "monitor" then
      table.insert(m, peripheral.wrap(name))
    elseif peripheral.getType(name) == "BigReactors-Reactor" then
      table.insert(r, peripheral.wrap(name))
    elseif peripheral.getType(name) == "draconic_rf_storage" then
      table.insert(c, peripheral.wrap(name))
    elseif peripheral.getType(name) == "Induction Matrix" then
      IM = peripheral.wrap(name)
      IMtf = true
    end
  end
  print("Turbines found: "..#t)
  print("monitors found: "..#m)
  print("Reactors found: "..#r)
  print("Energy Cores  : "..#c)
end

function numberMonitors()
  for i = 1, #m do
    m[i].setBackgroundColor(colors.black)
    m[i].clear()
    m[i].setCursorPos(1,1)
    m[i].setTextScale(5)
    m[i].write(tostring(i))
  end
end

function addMon(name)
  mon = string.gsub(name,"%a","")
  mon = string.gsub(mon,"%s","")
  mon = tonumber(mon)
  m[mon].write(" OK")
  table.insert(info, currentText..": "..mon)
  if numOfMonitors == 2 then
    currentPage = page2
  else
    numOfMonitors = numOfMonitors + 1
  end
end

function addPage1Buttons()
  posX = 1
  posY = 4
  for i=1,#m do
    page1:add("monitor "..i, nil, posX, posY, posX+11, posY+2, colors.blue, colors.lime)
    posY=posY+4
    if posY >= 17 then
      posY=4
      posX=posX+13
    end
  end
end

function addPage2Buttons()
  local reactor100 = {
          " -100 ",
          label = "r-100"
  }

  local reactor10 = {
          "  -10 ",
          label = "r-10"
  }

  local reactor5 = {
          "  -5  ",
          label = "r-5"
  }

  local reactorr5 = {
          "  +5  ",
          label = "r+5"
  }

  local reactorr10 = {
          "  +10 ",
          label = "r+10"
  }

  local reactorr100 = {
          " +100 ",
          label = "r+100"
  }

  page2:add(reactor100, function() reactorTemp = reactorTemp - 100 end, 1, 5, 6, 5, colors.purple, colors.lime)
  page2:add(reactor10, function() reactorTemp = reactorTemp - 10 end, 8, 5, 13, 5, colors.purple, colors.lime)
  page2:add(reactor5, function() reactorTemp = reactorTemp - 5 end, 15, 5, 20, 5, colors.purple, colors.lime)
  page2:add(reactorr5, function() reactorTemp = reactorTemp + 5 end, 32, 5, 37, 5, colors.purple, colors.lime)
  page2:add(reactorr10, function() reactorTemp = reactorTemp + 10 end, 39, 5, 44, 5, colors.purple, colors.lime)
  page2:add(reactorr100, function() reactorTemp = reactorTemp + 100 end, 46, 5, 51, 5, colors.purple, colors.lime)

  local turbine100 = {
          " -100 ",
          label = "t-100"
  }

  local turbine10 = {
          "  -10 ",
          label = "t-10"
  }

  local turbine5 = {
          "  -5  ",
          label = "t-5"
  }

  local turbinee5 = {
          "  +5  ",
          label = "t+5"
  }

  local turbinee10 = {
          "  +10 ",
          label = "t+10"
  }

  local turbinee100 = {
          " +100 ",
          label = "t+100"
  }

  page2:add(turbine100, nil, 1, 12, 6, 12, colors.purple, colors.lime)
  page2:add(turbine10, nil, 8, 12, 13, 12, colors.purple, colors.lime)
  page2:add(turbine5, nil, 15, 12, 20, 12, colors.purple, colors.lime)
  page2:add(turbinee5, nil, 32, 12, 37, 12, colors.purple, colors.lime)
  page2:add(turbinee10, nil, 39, 12, 44, 12, colors.purple, colors.lime)
  page2:add(turbinee100, nil, 46, 12, 51, 12, colors.purple, colors.lime)

  page2:add("save",function() end,46,19,51,19,colors.lime,colors.purple)
  page2:add("exit",function() end,1,19,6,19,colors.purple,colors.lime)
end

function numBoxes()
  if currentPage == page2 then
    term.setTextColor(colors.white)
    term.setBackgroundColor(colors.gray)
    pos = {}
    pos[1] = 3
    pos[2] = 10
    for v=1,2 do
      for i=1,3 do
        term.setCursorPos(22,pos[v]+i)
        term.write(string.rep(" ",9))
      end
    end
    term.setCursorPos(25,5)
    term.write(tostring(reactorTemp))
    term.setCursorPos(25,12)
    term.write(tostring(rotorSpeed))
  end
end

function title()
  term.setTextColor(colors.orange)
  term.setBackgroundColor(colors.black)
  if currentPage == page1 then
    if numOfMonitors == 0 then
      currentText = "Reactors"
    elseif numOfMonitors == 1 then
      currentText = "Turbines"
    elseif numOfMonitors == 2 then
      currentText = "Energy Cores"
    end
    term.setCursorPos(12,2)
    term.write("Select a monitor for: "..currentText)
  else
    term.setCursorPos(14,3)
    term.write("Avg. Reactor Temperature")
    term.setCursorPos(18,10)
    term.write("Avg. Rotor Speed")
  end
end

function save()
  local file = fs.open("config","w")
  local text = ""
  for _, line in pairs(info) do
    text = text..line.."\n"
  end
  file.write(text)
  file.close()
end

numOfMonitors = 0
currentPage=page1
getDevices()
numberMonitors()
addPage1Buttons()
addPage2Buttons()

while true do
  currentPage:draw()
  title()
  numBoxes()
  local event, p1 = currentPage:handleEvents(os.pullEvent())
  if event == "button_click" then
    if currentPage == page1 then
      if not page1.buttonList[p1].active then
        page1:toggleButton(p1)
        addMon(p1)
      end
    else
      if p1 == "exit" then
        break
      elseif p1 == "save" then
        save()
      else
        page2:flash(p1)
        page2:run(p1)
      end
    end
  end
end