RSI_BB

//@version=2
strategy("RSI_BB", overlay=true)
length = input( 30 )
overSold = input( 40 )
overBought = input( 60)
price = (high + low + close) / 3
source = (high + low + close) / 3
lengtha = input(50, minval=1)
mult = input(0.2, minval=0.001, maxval=50)
basis = sma(source, lengtha)
dev = mult * stdev(source, lengtha)
upper = basis + dev
lower = basis - dev
buyEntry = crossover(source, lower)
sellEntry = crossunder(source, upper)
vrsi = rsi(price, length)

if (not na(vrsi))
    if (source > upper)and(vrsi < 40) 
        strategy.entry("RsiLE", strategy.long, comment="Buy")
    if (source < lower)and(vrsi > 60)
        strategy.entry("RsiSE", strategy.short, comment="Sell")
   
        
        
//plot(strategy.equity, title="equity", color=red, linewidth=2, style=areabr)