Following a request on the italian forum (https://www.prorealcode.com/topic/rsi-normalizzato-con-bb/), I made this screener to apply the Bollinger Bands to RSI, so that they act a OverBought/OverSold tresholds.
MyRsi = Rsi[9](close) //9 Rsi periods
BBVal = 40 //40 BB periods
BBdev = 2.0 //2.0 BB deviation
BBavg = average[BBval,1](MyRsi) //BB mean (EMA middle line)
BollUp = BBavg + ((std[BBval](MyRsi)) * BBdev) //BB Upper Band
BollDn = BBavg - ((std[BBval](MyRsi)) * BBdev) //BB Lower Band
x1 = MyRsi CROSSES OVER BollUP
x2 = MyRsi CROSSES UNDER BollDN
Signal= 0
IF x1 THEN
Signal = 1
ELSIF x2 THEN
Signal = 2
ENDIF
SCREENER[Signal](Signal AS "1=↑, 2=↓")