OpenRadio computer

modem = peripheral.wrap("left")
m = peripheral.wrap("right")
m.clear()

os.loadAPI("button")

local radio = {}
local frequence = 0
local volume = 1
local nom = {
  [1] = "off",
  [2] = "Nova",
  [3] = "Europe1",
  [4] = "RTL2",
  [5] = "Azenet"
}

button.setTable("off",0,23,26,2,2)
button.setTable("Nova",1,3,14,5,7)
button.setTable("Europe1",2,16,27,5,7)
button.setTable("RTL2",3,3,14,9,11)
button.setTable("Azenet",4,16,27,9,11)
button.setTable("<",10,2,2,15,15)
button.setTable(">",11,28,28,15,15)
button.toggleButton("off")

function execut(nb)
    if nb == 0 then
        volume = 1
    end
    if nb>=0 and nb <= 4 then
        button.toggleButton(nom[frequence+1])
        frequence = nb
        button.toggleButton(nom[nb+1])
    end
    if nb == 10 and volume > 1 then
        volume = volume-1
    end
    if nb == 11 and volume < 15 then
        volume = volume+1
    end
    radio["fr"] = frequence
    radio["vl"] = volume
    modem.transmit(123,12,textutils.serialize(radio))
    print(frequence..":"..volume)
end

function ecran()
    m.clear()
    button.screen()
    button.label(3,2,"OpenRadio")
    button.label(10,13,"Volume")
    button.label(12,17,volume.." V.")
    button.label(13,19,"By Darking560")
    local aff = math.floor((volume/15)*12)
    m.setBackgroundColor(colors.gray)
    for i=0,aff do
        m.setCursorPos(4+(2*i),15)
        m.write(" ")
    end
    m.setBackgroundColor(colors.black)
end

while true do
    ecran()
    sleep(2)
    event, side, x, y = os.pullEvent("monitor_touch")
    local nb = button.checkxy(x,y)
    execut(nb)
end