OPEN-SOURCE SCRIPT

Atlantean Sideways / Range Regime Detector

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Purpose
When using trend based indicators, you can skip the false signals when there is a sideways action, protecting you from the false signals.
Flags likely sideways/range phases using three checks:
  • Weak trend (ADX from DMI)
  • Price compression (Bollinger Band Width, normalized)
  • Low volatility (NATR = ATR/Price%)

Logic
  • Pine Script®
    isSideways = (ADX < adxThresh) AND (bbNorm < 0.25) AND (NATR < natrMax)
  • When true: bars + background turn teal and a provisional Range High/Low (rolling rangeWin) is drawn.

Key Inputs
  • DMI: diLen(22)
    Optimized for 15 mins Bitcoin, could change it to 14 for more general approach
  • ADX: adxSmooth(14), adxThresh(18)
  • Volatility: lenATR(14), natrMax(1.8)
  • Visuals: rangeWin(20), bar/range toggles

Quick Tuning
  • More signals: raise adxThresh to 20–25, raise natrMax to 2.5–4.0, increase BB cutoff by editing bbNorm < 0.25 --> 0.35–0.50.
  • Smoother range lines: increase rangeWin to 30–40.

Use Cases
  • Mean reversion inside teal ranges.
  • Breakout prep when price closes outside the drawn range after teal ends. Could be used as a signal although not suggested.
  • Filter trend systems: skip trades when sidewaysCond is true. This is the main purpose, for it to be combined with trend based indicators, like Supertrend.

Alert
  • “Sideways Detected” triggers when isSideways is true.

Script could be expanded upon your requests.

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