Sentinel EA Deep Dive: Bollinger Bands and Stochastic on AUDCAD M15

EA Deep Dives · 8 min read

Sentinel EA trades AUDCAD on the M15 timeframe and forms the second half of the Velocity and Sentinel pair. While both EAs share a similar recovery structure, their entry logic differs: Sentinel replaces the Envelopes indicator used by Velocity with a Stochastic oscillator for entry confirmation.

This different entry mechanism means Sentinel and Velocity do not enter trades at exactly the same moments — which is what provides the portfolio diversification benefit when both run simultaneously.

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Why AUDCAD for Sentinel

AUDCAD is a commodity currency cross driven by iron ore and copper prices (AUD side) versus oil prices (CAD side). The pair tends to oscillate based on relative commodity performance rather than interest rate differentials — making it behaviorally distinct from USDCAD even though both share the Canadian dollar.

AUDCAD typically has lower volatility than USDCAD during North American events like NFP, because AUD is less directly affected by US economic data than USD. This means Sentinel’s recovery cycles are often triggered by different events than Velocity’s — the diversification benefit in action.

Entry Logic: Bollinger Bands + Stochastic

Sentinel’s entry signal requires two conditions simultaneously:

1. Bollinger Band extreme: Price closes outside the upper or lower Bollinger Band, indicating the pair has moved statistically far from its recent mean
2. Stochastic confirmation: The Stochastic oscillator is in overbought territory (for sell signals) or oversold territory (for buy signals), confirming momentum has reached an extreme

The Stochastic filter adds value because it specifically measures momentum exhaustion — the rate of price change slowing at the extreme. A Bollinger Band touch that coincides with slowing momentum is a higher-probability reversal signal than a Band touch with continuing momentum.

Shared Recovery Structure

Sentinel uses the same recovery structure as Velocity: orders 1 and 2 at the same lot size, scaling from order 3 onward, capped at 8 total orders. The minimum account balance for Sentinel is $1,000 — lower than Velocity’s $1,500 because AUDCAD’s lower volatility during North American events means recovery cycles are typically less severe.

Running Sentinel and Velocity Together

The intended configuration is to run both EAs simultaneously on the same MT5 account using different magic numbers. Each EA manages its own positions independently. The combined minimum balance is $2,500 — $1,500 for Velocity and $1,000 for Sentinel — though $4,000+ provides a more comfortable buffer for simultaneous recovery cycles.

The portfolio benefit: during periods when USDCAD is in an extended recovery cycle (perhaps driven by Bank of Canada events), AUDCAD may be in a profitable period (driven by AUD commodity price tailwinds). The two systems balance each other’s stress periods more often than they compound them.