Just another RSI with 2 bollinger bands. Coded following a request in the indicator forum section.

Initial data:

1) RSI
2) Bollinger Bands (Basis – EMA )
3) Dispersion (around basis)

Signal for purchase: RSI crosses the dispersion zone upwards
Signal for sale: RSI crosses the dispersion zone downwards
Buffer zone: white area, it is not recommended to make transactions.

— Add (02.10.2018)

1) RSI lines (overbought / oversold) = 70 / 30. Сan be changed in the settings.
2) Alerts:
• RSI line crossover Dispersion Zone (green)
• RSI line crossunder Dispersion Zone (red)

//PRC_RSI+BB (EMA)+Dispersion | indicator
//05.09.2022
//Nicolas @ www.prorealcode.com
//Sharing ProRealTime knowledge
//converted from pinescript

// --- settings 
forrsi = 14 //RSI_period
forma = 20 //Basis_BB
formult = 2 // Stdev
forsigma = 0.1 //Dispersion
// --- end of settings 

src = customclose

currentrsi = rsi[forrsi](src) 
basis = average[forma](currentrsi)
dev = formult * std[forma](currentrsi)
upper = basis + dev
lower = basis - dev
dispup = basis + ((upper - lower) * forsigma)
dispdown = basis - ((upper - lower) * forsigma) 

if currentrsi>=dispup then 
r=0
g=255
elsif currentrsi<=dispdown then 
r=255
g=0
else
r=255
g=234
endif

colorbetween(70,30,"white",95)
colorbetween(dispup,dispdown,"white",80)

return 70 coloured(212,212,212,95) style(dottedline),30 coloured(212,212,212,95) style(dottedline), currentrsi coloured(r,g,0) style(line,2), basis, upper style(line,2) coloured(0,255,240), lower style(line,2) coloured(0,255,240), dispup coloured("white"), dispdown coloured("white")