RSI MultiTimeframe Indicator

//@version=3
//
// GitHub: https://github.com/Heavy91/TradingView_Indicators
//
// TradingView: https://www.tradingview.com/u/Heavy91/#published-scripts
//
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
// If you like my work, you can support me with a donation:
// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - 
// €: http://pinescripts.fetchapp.com/sell/d15d4740
//
// $: http://pinescripts.fetchapp.com/sell/0f9153a5
//
// BTC: bc1q8e4wav3t55plp6ar0xc7gh4uqrzlxc7g97ywrg
//
// LTC: ltc1qagcys3pyluke3xdlq94qx8p7fd3z3mj2w32grs
//
// ----------------------------------------------------------------------------
// RSI MultiTimeframe Indicator
// ----------------------------------------------------------------------------
// Plots 3 RSI (Weekly, Daily, 4h) at the same time, regardless of the Chart Timeframe.
// Highlights in green (or red) if all RSI are oversold (or overbought).
// Can trigger custom oversold and overbought alerts.

study(title = "RSI Multi TF", shorttitle="RSI Multi TF (W, D, 4h)")
source = close
length = input(14, minval=1)
HighlightBreaches=input(true, title="Highlight Oversold and Overbought?", type=bool)

// RSI
RSI_1 = security(tickerid, "W", rsi(source, length))
RSI_2 = security(tickerid, "D", rsi(source, length))
RSI_3 = security(tickerid, "240", rsi(source, length))

plot(RSI_3, title = "4h", color=gray, linewidth=1)
plot(RSI_2, title = "D", color=red, linewidth=2)
plot(RSI_1, title = "W", color=yellow, linewidth=3)

UpperBand = input(70, title="Upper band")
LowerBand = input(30, title="Lower band")

b_color = ((RSI_3 > UpperBand)and(RSI_1 > UpperBand)and(RSI_2 > UpperBand)) ? red : ((RSI_3 < LowerBand)and(RSI_1 < LowerBand)and(RSI_2 < LowerBand)) ? green : na
bgcolor(HighlightBreaches ? b_color : na, transp=50)

h0 = hline(UpperBand, title="Upper band", linestyle=dashed, linewidth=1, color=red)
h1 = hline(LowerBand, title="Lower band", linestyle=dashed, linewidth=1, color=green)
fill(h0, h1)

alertcondition(b_color == green, title='MultiOversold', message='Multi Oversold!')
alertcondition(b_color == red, title='MultiOverbought', message='Multi Overbought!')