Backup-Mirrors/Standalone-electricity-price-ticker
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Bump version to 6.2.0 with DST improvements

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Updated version information to 6.2.0 with critical DST fix and new functions.
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Amir
2026-03-29 17:28:31 +02:00
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1 changed files with 26 additions and 35 deletions
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VERSION.md
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## Current firmware ## Current firmware
- **Version:** 6.1.2 - **Version:** 6.2.0
- **Release date:** 2026-03-11 - **Release date:** 2026-03-29
- **Target MCU:** Seeed XIAO ESP32‑C3 - **Target MCU:** Seeed XIAO ESP32‑C3
- **Display:** 20x4 I²C LCD (PCF8574, default address `0x27`) - **Display:** 20x4 I²C LCD (PCF8574, default address `0x27`)
- **API endpoint:** `https://api.energy-charts.info/price?bzn=SI` - **API endpoint:** `https://api.energy-charts.info/price?bzn=SI`
- **Resolution:** 15‑minute intervals, hourly averages for overview - **Resolution:** 15‑minute intervals, hourly averages for overview
## Highlights of v6.1.2 ## Highlights of v6.2.0
- Fix: restore proper white LED price indicator behavior on ESP32 by avoiding mixing PWM (`analogWrite`) and `digitalWrite` on the same pin. - **CRITICAL FIX**: DST (Daylight Saving Time) handling is now fully fixed for all days.
- Fix: LED is now truly off when backlight/LED gating turns it off (no more “dim glow”). - Previously, the code assumed every day has exactly 96 price entries (24h × 4). This caused incorrect price display on DST switch days:
- Change: `updateLeds()` uses PWM only (`analogWrite(pin, 0/255)`) for off/on and blink toggles. - Spring forward (March): Only 92 entries → wrong prices displayed
- Fall back (October): 100 entries → wrong prices displayed
- **Solution**: All price lookups now use timestamp-based searching through the `unix_seconds` array instead of arithmetic calculation (`hourIndex * 4`).
- New functions: `findPriceIndexForHour()`, `findCurrentPriceIndex()`, `getHourFromPriceIndex()`
- Updated functions: `getHourlyAverage()`, `display15MinuteDetails()`, `displayPriceRow()`, `displayPrimaryList()`, `updateLeds()`
- The ticker now works correctly on all days, including DST switch days, with no manual intervention.
- **Future-proof**: If EU cancels DST, only the `TZ_CET_CEST` string needs updating (one line of code).
For full details, see: For full details, see:
@@ -22,34 +28,19 @@ For full details, see:
## Previous firmware ## Previous firmware
- **Version:** 6.1.1 - **Version:** 6.1.2
- **Release date:** 2026-03-07 - **Release date:** 2026-03-11
- **Target MCU:** Seeed XIAO ESP32‑C3 - **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 v6.1.1 ## Highlights of v6.1.2
- Fix: daily **lowest/highest hourly price marker** now includes **negative** and **0.0** prices. - Fix: restore proper white LED price indicator behavior on ESP32 by avoiding mixing PWM (`analogWrite`) and `digitalWrite` on the same pin.
- Fix: daily average is computed over the number of valid hours (instead of always dividing by 24 even when hours were skipped). - Fix: LED is now truly off when backlight/LED gating turns it off (no more "dim glow").
## Earlier firmware ## Earlier firmware
- **Version:** 6.0.0 - **Version:** 6.1.1 (2026-03-07) – Daily low/high marker includes negative and zero prices
- **Release date:** 2026-01-27 - **Version:** 6.1.0 (2026-01-30) – Midnight fetch and market day detection fixes
- **Target MCU:** Seeed XIAO ESP32‑C3 - **Version:** 6.0.0 (2026-01-27) – NVS storage and daily fetch
- **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 v6.0.0 For detailed history, see [CHANGELOG.md](./CHANGELOG.md).
- Single **daily fetch** (on boot / after midnight) instead of hourly.
- **NVS storage** of daily data for resilience to power outages.
- Robust midnight rollover and retry logic:
- First immediate fetch.
- Up to 5 × 10‑minute retries.
- Then top‑of‑hour retries until successful.
- Prevents yesterday’s prices from ever being shown as today’s.
- Secondary info menu extended with **NVS status** and clear version label.