coil-scan

Coil Scan — dual-timeframe %R Trend Exhaustion

Mirrors the "%R Trend Exhaustion [upslidedown]" TradingView indicator (dual timeframe 21 + 112). Finds stocks that are both deeply oversold AND just starting to reverse.

The indicator math

• %R(n) = Williams %R = 100 * (close - highestHigh_n) / (highestHigh_n - lowestLow_n), range −100…0.
• Fast leg = EMA(7) of %R(21).
• Slow leg = EMA(3) of %R(112).
• Threshold (TH) = −80.
• In the coil: both fast AND slow ≤ −80. The short-term AND the structural picture are both deeply oversold. This is the stalk zone — a name can sit here for days/weeks before the trigger fires.
• Triggered out: fast crossed back above −80 while it was recently (within ~20 bars) coiled on both legs. The slow leg still lagging confirms the structural exhaustion hasn't reset — this is the bullish reversal signal.

Two output buckets

⚡ TRIGGERED OUT (≤3 days ago)

Fast just crossed back above −80. These are actionable reversal candidates.

A sanity check filters false-positives:

• If the close is already >5% above the price on the trigger date → tagged "already ran — not fresh" and downranked.
• If the close is now above EMA21 → same tag.

The canonical false-positive this catches: SLB crossed up but had already run +4% to just under its 21EMA by the time the scan ran — that's a chase, not an entry. It lands in the sanity-filtered section, not the fresh list.

🟢 IN THE COIL (stalk candidates)

Both legs ≤ −80, no trigger yet. Sorted deepest-first (most negative slow leg = most structurally exhausted).

The days-in-coil counter comes from the persistent state file (state/coil_watch.json), so the scan can say "IREN — day 6 in the coil." A name stays in the store until it triggers or exits the coil entirely.

Per-name display

SYM    fast%R   slow%R   depth    close   day-in-coil   vs SMA200  vs EMA21
IREN    -92.3    -88.1   -8.1    $7.42   day 3          below SMA200  below EMA21