On-Balance Volume (OBV)

//@version=6
indicator("On-Balance Volume (OBV)", overlay=false)
emaLen  = input.int(21, "OBV EMA")
trendLen = input.int(50, "Trend EMA")
obvVal  = ta.obv
obvEma  = ta.ema(obvVal, emaLen)
trend   = ta.ema(close, trendLen)
longSignal = ta.crossover(obvVal, obvEma) and close > trend
exitSignal = ta.crossunder(obvVal, obvEma) or close < trend
plotshape(longSignal, style=shape.triangleup,   location=location.bottom, color=color.green, size=size.small)
plotshape(exitSignal, style=shape.triangledown, location=location.top,    color=color.red,   size=size.small)
plot(obvVal, "OBV",     color=color.aqua)
plot(obvEma, "OBV EMA", color=color.orange)

def obv = OnBalanceVolume();
def obvAvg = ExpAverage(obv, 21);
def trend = ExpAverage(close, 50);
def buySignal = obv crosses above obvAvg and close > trend;
def sellSignal = obv crosses below obvAvg or close < trend;
AddOrder(OrderType.BUY_AUTO, buySignal, close, 1, Color.GREEN, Color.GREEN, "Volume Buy");
AddOrder(OrderType.SELL_AUTO, sellSignal, close, 1, Color.RED, Color.RED, "Volume Exit");
plot OBVLine = obv;
OBVLine.SetDefaultColor(Color.CYAN);
plot OBVAvg = obvAvg;
OBVAvg.SetDefaultColor(Color.ORANGE);