LiquidCounter

sensorSide = "back"
inputRSSide = "top"
outputRSSide = "left"
flowRSInputSide = "right"
monitorSide = "front"

-- DO NOT EDIT
os.loadAPI("ocs/apis/sensor")
se = sensor.wrap("back")

counter = 0

-- 0 Loading
-- 1 Start Unloading
-- 2 Unloading
-- 3 Finish Unloading
status = 0
rs.setOutput("top", false)
rs.setOutput("left", true)

local maxw, maxh = term.getSize()

function printCentered(text)
    local maxw, maxh = term.getSize()
    local curx, cury = term.getCursorPos()
    term.setCursorPos((maxw - #text) / 2, cury)
    term.write(text)
    term.setCursorPos(curx, cury + 1)
end

while true do
     targets = se.getTargets()
    for name, data in pairs(targets) do
        details = se.getTargetDetails(name)
        if data["Name"] == "tile.tankBlock" and details ~= nil then
            if status == 0 then
                if details.Tanks[1].Amount >= 1000 then
                    rs.setOutput("top", true)
                    sleep(0.5)
                    details = se.getTargetDetails(name)
                    counter = counter + details.Tanks[1].Amount + 500

                    rs.setOutput("left", false)
                    status = 1
                end

                term.clear()
                term.setCursorPos(1, math.floor(maxh / 2))
                printCentered("Count: "..counter)

            elseif status == 1 then
                if details.Tanks[1].Amount == 0 then
                    status = 2
                end
            elseif status == 2 then
                if rs.getInput("right") then
                    status = 3
                end
            elseif status == 3 then
                if not rs.getInput("right") then
                    rs.setOutput("top", false)
                    rs.setOutput("left", true)
                    status = 0
                end
            end
        end
    end
end