startup

local p1 = 'left'
local p2 = 'top'
local p3 = 'bottom'
local p4 = 'back'
local p5 = 'right'

local p1State = false
local p2State = false
local p3State = false
local p4State = false
local p5State = false

function togglePiston(index)
    if index == 1 then
        p1State = not p1State
        rs.setOutput(p1, p1State)
    elseif index == 2 then
        p2State = not p2State
        rs.setOutput(p2, p2State)
    elseif index == 3 then
        p3State = not p3State
        rs.setOutput(p3, p3State)
    elseif index == 4 then
        p4State = not p4State
        rs.setOutput(p4, p4State)
    elseif index == 5 then
        p5State = not p5State
        rs.setOutput(p5, p5State)
    end
end

function extendPistons()
    togglePistion(1)
    sleep(0.25)
    togglePistion(3)
    sleep(0.25)
    togglePistion(5)
end

function retractPistons()
    togglePistion(5)
    sleep(0.25)
    togglePistion(3)
    sleep(0.25)
    togglePistion(4)
    sleep(0.25)
    togglePistion(4)
    sleep(0.25)
    togglePistion(1)
    sleep(0.25)
    togglePistion(2)
    sleep(0.25)
    togglePistion(2)
    sleep(0.25)
    togglePistion(3)
    sleep(0.25)
    togglePistion(3)
end

print('Press and hold CTRL+T to stop')

while true do
    extendPistons()
    sleep(1)
    retractPistons()
    sleep(5)
end