Update to v6.2.2 - Screen blank lines issue fix

Update to v6.2.2 - Screen blank lines issue fix after v6.2.0 DST Fix

  - Problem: Sometimes rows 0 and 1 (current 15-min prices and current hour) were blank
  - Cause: The "hour suppression" logic was hiding the current hour unexpectedly
  - Fix: Row 1 (current hour) now ALWAYS shows - suppression logic only applies to rows 2-3
  - Row 0 (15-min details) also always shows for the current hour

CHANGELOG.md

@@ -4,6 +4,48 @@ All notable changes to this project are documented here.
 
 ---
 
+## v6.2.1 – Current Interval Fix (2026‑03‑29)
+
+**Summary**
+
+Fixed a bug where the display was showing prices one hour ahead of the current time.
+
+### Problem: Display Showing Next Hour Instead of Current
+
+**Root Cause:**
+
+The `findCurrentPriceIndex()` function was finding the **next** 15-minute interval (first entry with timestamp >= now), but it should find the **current** interval (the one we're currently IN).
+
+For example, at 17:57:
+- The current 15-minute interval is **17:45-18:00** (price indexed at 17:45)
+- The **next** interval is 18:00-18:15 (price indexed at 18:00)
+- The buggy function returned the index for **18:00** instead of **17:45**
+- Result: Display showed hour **18** instead of hour **17**
+
+### Solution
+
+The fix calculates the **next 15-minute boundary** and finds the last entry **strictly before** that boundary:
+
+```cpp
+// Calculate the next 15-minute boundary
+const int QUARTER_SECONDS = 15 * 60; // 900 seconds
+time_t nextQuarter = ((now + QUARTER_SECONDS - 1) / QUARTER_SECONDS) * QUARTER_SECONDS;
+
+// Find the last entry strictly before nextQuarter
+for (size_t i = unixSeconds.size(); i > 0; i--) {
+    if ((time_t)unixTime < nextQuarter) {
+        return (int)(i - 1);
+    }
+}
+```
+
+**Example:**
+- At 17:57: nextQuarter = 18:00, finds last entry < 18:00 = 17:45 ✅
+- At 18:00: nextQuarter = 18:15, finds last entry < 18:15 = 18:00 ✅
+- At 18:46: nextQuarter = 19:00, finds last entry < 19:00 = 18:45 ✅
+
+---
+
 ## v6.2.0 – DST (Daylight Saving Time) Handling Fixed (2026‑03‑29)
 
 **Summary**

README.md

@@ -5,13 +5,23 @@
 This project is an Arduino‑IDE‑friendly firmware for the **Seeed XIAO ESP32‑C3** that:
 
 - Connects to Wi‑Fi.
-- Fetches **day‑ahead electricity prices** from [Energy‑Charts.info](https://energy-charts.info) (Bundesnetzagentur / SMARD.de).
+- Fetches **day‑ahead electricity prices** from [Energy‑Charts.info](https://energy-charts.info).
 - Computes final consumer prices (including configurable power‑company fee + VAT).
 - Displays current and upcoming prices on a **20x4 I²C 2004 LCD**.
 - Uses a white LED and an optional presence sensor to give quick visual feedback.
 - Stores daily price data in **NVS** to survive reboots and reduce API calls.
 
-The latest sketch implements **Version 6.2.0**, focusing on:
+The latest sketch implements **Version 6.2.1**.
+
+---
+
+## Version Highlights
+
+### v6.2.1 – Current Interval Fix (critical fix of v6.2.0 update)
+- Fixed display showing prices one hour ahead of the current time.
+- `findCurrentPriceIndex()` now correctly returns the current 15-minute interval.
+
+Major update sketch implements **Version 6.2.0**, focusing on:
 
 - **Version 6.2.0 FIX**: **DST (Daylight Saving Time) handling fully fixed** – the ticker now works correctly on ALL days including DST switch days (spring forward and fall back). Uses timestamp-based price lookups instead of arithmetic calculations.
 - Version 6.1.2 fix: restore correct **white LED indicator** behavior (ESP32 PWM fix; no dim glow when off).

VERSION.md

@@ -2,13 +2,19 @@
 
 ## Current firmware
 
-- **Version:** 6.2.0
+- **Version:** 6.2.1
 - **Release date:** 2026-03-29
 - **Target MCU:** Seeed XIAO ESP32‑C3
 - **Display:** 20x4 I²C LCD (PCF8574, default address `0x27`)
 - **API endpoint:** `https://api.energy-charts.info/price?bzn=SI`
 - **Resolution:** 15‑minute intervals, hourly averages for overview
 
+## Highlights of v6.2.1
+
+- **BUG FIX**: Fixed `findCurrentPriceIndex()` to return the correct current interval.
+- Problem: At 17:57, it returned index for 18:00 instead of 17:45, causing display to show hour 18 instead of hour 17.
+- Fix: Now calculates next 15-minute boundary and finds the last entry before that boundary.
+
 ## Highlights of v6.2.0
 
 - **CRITICAL FIX**: DST (Daylight Saving Time) handling is now fully fixed for all days.