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Bollinger Aroon

The Bollinger Aroon strategy searches for pullbacks inside a strong uptrend.
When price stretches beneath the lower Bollinger Band but the Aroon Up value remains elevated, the system assumes the trend is intact and looks for a reversion toward the mean. It only trades long, seeking to capture the snap back after a temporary dip.

The setup triggers after a finished candle closes below the lower band while Aroon Up exceeds the confirmation level. The position remains open until the Aroon reading drops under a stop threshold or price rallies to the upper band. The band width adapts to volatility, allowing the strategy to trade quiet and active markets alike.

Backtests on major crypto pairs show the approach excels during strong trends with occasional shakeouts. Because entries require both volatility expansion and a persistent Aroon Up reading, false signals are reduced compared with a plain Bollinger reversal.

Details

  • Data: Price candles.
  • Entry Criteria:
    • Long: Close below lower band AND Aroon Up > confirmation level.
    • Short: not used.
  • Exit Criteria:
    • Close touches upper band OR Aroon Up < stop level.
  • Stops: Indicator based; no fixed stop by default.
  • Default Values:
    • BBLength = 20
    • BBMultiplier = 2.0
    • AroonLength = 288
    • AroonConfirmation = 90
    • AroonStop = 70
  • Filters:
    • Category: Mean reversion within trend
    • Direction: Long only
    • Indicators: Bollinger Bands, Aroon
    • Complexity: Moderate
    • Risk level: Medium
using System;
using System.Collections.Generic;

using Ecng.Common;

using StockSharp.Algo.Indicators;
using StockSharp.Algo.Strategies;
using StockSharp.BusinessEntities;
using StockSharp.Messages;

namespace StockSharp.Samples.Strategies;

/// <summary>
/// Bollinger Bands + Aroon Strategy.
/// Buys when price touches lower Bollinger Band with Aroon Up confirming uptrend.
/// Exits when price reaches upper Bollinger Band or Aroon signals weakness.
/// </summary>
public class BollingerAroonStrategy : Strategy
{
	private readonly StrategyParam<DataType> _candleTypeParam;
	private readonly StrategyParam<int> _bbLength;
	private readonly StrategyParam<decimal> _bbMultiplier;
	private readonly StrategyParam<int> _aroonLength;
	private readonly StrategyParam<decimal> _aroonConfirmation;
	private readonly StrategyParam<decimal> _aroonStop;

	/// <summary>
	/// Candle type for strategy calculation.
	/// </summary>
	public DataType CandleType
	{
		get => _candleTypeParam.Value;
		set => _candleTypeParam.Value = value;
	}

	/// <summary>
	/// Bollinger Bands period.
	/// </summary>
	public int BBLength
	{
		get => _bbLength.Value;
		set => _bbLength.Value = value;
	}

	/// <summary>
	/// Bollinger Bands standard deviation multiplier.
	/// </summary>
	public decimal BBMultiplier
	{
		get => _bbMultiplier.Value;
		set => _bbMultiplier.Value = value;
	}

	/// <summary>
	/// Aroon indicator period.
	/// </summary>
	public int AroonLength
	{
		get => _aroonLength.Value;
		set => _aroonLength.Value = value;
	}

	/// <summary>
	/// Aroon confirmation level.
	/// </summary>
	public decimal AroonConfirmation
	{
		get => _aroonConfirmation.Value;
		set => _aroonConfirmation.Value = value;
	}

	/// <summary>
	/// Aroon stop level.
	/// </summary>
	public decimal AroonStop
	{
		get => _aroonStop.Value;
		set => _aroonStop.Value = value;
	}

	private BollingerBands _bollinger;
	private Aroon _aroon;
	private int _cooldownRemaining;

	public BollingerAroonStrategy()
	{
		_candleTypeParam = Param(nameof(CandleType), TimeSpan.FromMinutes(15).TimeFrame())
			.SetDisplay("Candle type", "Candle type for strategy calculation.", "General");

		_bbLength = Param(nameof(BBLength), 20)
			.SetGreaterThanZero()
			.SetDisplay("BB Period", "Bollinger Bands period", "Bollinger Bands");

		_bbMultiplier = Param(nameof(BBMultiplier), 2.0m)
			.SetDisplay("BB StdDev", "Bollinger Bands standard deviation multiplier", "Bollinger Bands");

		_aroonLength = Param(nameof(AroonLength), 14)
			.SetGreaterThanZero()
			.SetDisplay("Aroon Period", "Aroon indicator period", "Aroon");

		_aroonConfirmation = Param(nameof(AroonConfirmation), 60m)
			.SetDisplay("Aroon Confirmation", "Aroon confirmation level", "Aroon");

		_aroonStop = Param(nameof(AroonStop), 40m)
			.SetDisplay("Aroon Stop", "Aroon stop level", "Aroon");
	}

	/// <inheritdoc />
	public override IEnumerable<(Security sec, DataType dt)> GetWorkingSecurities()
		=> [(Security, CandleType)];

	/// <inheritdoc />
	protected override void OnReseted()
	{
		base.OnReseted();

		_bollinger = null;
		_aroon = null;
		_cooldownRemaining = 0;
	}

	/// <inheritdoc />
	protected override void OnStarted2(DateTime time)
	{
		base.OnStarted2(time);

		_bollinger = new BollingerBands
		{
			Length = BBLength,
			Width = BBMultiplier
		};

		_aroon = new Aroon { Length = AroonLength };

		var subscription = SubscribeCandles(CandleType);

		subscription
			.BindEx(_bollinger, _aroon, OnProcess)
			.Start();

		var area = CreateChartArea();
		if (area != null)
		{
			DrawCandles(area, subscription);
			DrawIndicator(area, _bollinger);
			DrawOwnTrades(area);
		}
	}

	private void OnProcess(ICandleMessage candle,
		IIndicatorValue bollingerValue, IIndicatorValue aroonValue)
	{
		if (candle.State != CandleStates.Finished)
			return;

		if (!_bollinger.IsFormed || !_aroon.IsFormed)
			return;

		var bb = (BollingerBandsValue)bollingerValue;
		if (bb.LowBand is not decimal lowerBand ||
			bb.UpBand is not decimal upperBand ||
			bb.MovingAverage is not decimal middleBand)
			return;

		var aa = (AroonValue)aroonValue;
		if (aa.Up is not decimal aroonUp)
			return;

		if (!IsFormedAndOnlineAndAllowTrading())
			return;

		if (_cooldownRemaining > 0)
		{
			_cooldownRemaining--;
			return;
		}

		var close = candle.ClosePrice;

		// Long entry: price at/below lower BB + Aroon Up confirming uptrend
		if (close <= lowerBand && aroonUp > AroonConfirmation && Position <= 0)
		{
			if (Position < 0)
				BuyMarket(Math.Abs(Position));
			BuyMarket(Volume);
			_cooldownRemaining = 12;
		}
		// Short entry: price at/above upper BB + Aroon Up weak
		else if (close >= upperBand && aroonUp < AroonStop && Position >= 0)
		{
			if (Position > 0)
				SellMarket(Math.Abs(Position));
			SellMarket(Volume);
			_cooldownRemaining = 12;
		}
		// Exit long: price reaches upper band or Aroon signals weakness
		else if (Position > 0 && (close >= upperBand || aroonUp < AroonStop))
		{
			SellMarket(Math.Abs(Position));
			_cooldownRemaining = 12;
		}
		// Exit short: price reaches lower band or Aroon signals strength
		else if (Position < 0 && (close <= lowerBand || aroonUp > AroonConfirmation))
		{
			BuyMarket(Math.Abs(Position));
			_cooldownRemaining = 12;
		}
	}
}