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https://github.com/Legolas-2025/Standalone-electricity-price-ticker.git
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Bump version to 7.0 and update release notes
Updated version information to 7.0 with new features and fixes.
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## Current firmware
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- **Version:** 6.2.4
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- **Release date:** 2026-04-01
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- **Version:** 7.0
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- **Release date:** 2026-04-03
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- **Target MCU:** Seeed XIAO ESP32‑C3
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- **Display:** 20x4 I²C LCD (PCF8574, default address `0x27`)
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- **API endpoint:** `https://api.energy-charts.info/price?bzn=SI`
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- **Resolution:** 15‑minute intervals, hourly averages for overview
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## Highlights of v6.2.4
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## Highlights of v7.0
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- **BUG FIX:** Exact-boundary display refresh bug
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- Problem: At the exact top of the hour (e.g., 20:00:00), the display automatically refreshed but showed the PREVIOUS hour's data (19:00). This happened because the "next-boundary" rounding logic in findCurrentPriceIndex() incorrectly excluded the current interval if the time was exactly on the boundary.
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- Fix: Simplified findCurrentPriceIndex() to use a robust "last entry <= now" comparison. This ensures the display transitions to the new hour instantaneously at XX:00:00.
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### MAJOR UPGRADE: Rolling 48-Hour Logic & Midnight Bridge
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## Highlights of v6.2.3
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This version is the **"Golden Build"** for this hardware. It represents the culmination of hardware stability fixes from v6.2.4 combined with revolutionary new 48-hour price prediction capabilities.
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#### 1. The Midnight Bridge (Rollover Logic)
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The most complex part of electricity tickers is handling the midnight transition. This code now correctly detects the moment the local clock moves from 23:59:59 to 00:00:00.
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**The Swap:** Instead of waiting for a slow API call at midnight (which usually fails because the server hasn't updated yet), the code instantly promotes the "Tomorrow" buffer to become "Today" data.
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**The NVS Update:** The code correctly serializes the new "Today" data and saves it to NVS immediately after the swap. This ensures that if power cuts at 00:05 AM, the device reboots with the correct data already loaded.
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#### 2. Dual-Buffer NVS System
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The ticker now stores "Today" and "Tomorrow" data independently in NVS:
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- **Today buffer (`doc`)**: Contains the current day's price data
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- **Tomorrow buffer (`docTomorrow`)**: Contains the next day's price data
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- **NVS keys**: `data_prc`/`data_day`/`data_mon`/`data_year` for today, `data_prc_t`/`data_store_t` for tomorrow
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#### 3. Smart Fetching & API URL
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The logic for fetching tomorrow's data is implemented correctly:
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- **URL Construction**: Adding `&start=YYYY-MM-DD` dynamically after 14:00 (2 PM) queries the Energy-Charts API for the next day
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- **Validation**: In `processJsonData()`, the code compares the timestamp in the JSON against the target date, preventing the "Tomorrow" buffer from being filled with "Today's" data if the API is lagging
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#### 4. Seamless 48H Scrolling
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If next-day data is available, the button allows scrolling up to **47 hours ahead**:
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- **Visual Distinction**: Using `HH:>>` for tomorrow's hours prevents the user from confusing a cheap price "tomorrow" with a cheap price "today"
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- **Index Safety**: The code correctly uses `lowestPriceIndexTomorrow` and `highestPriceIndexTomorrow` when the display is in the "tomorrow" range, ensuring the Min/Max icons appear on the correct 15-minute segments
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#### 5. Hardware Stability (Inherited from v6.2.4)
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All v6.2.4 hardware stability fixes are preserved:
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- **Refresh Logic**: "State-Based" refresh ensures the display updates exactly at 00, 15, 30, and 45 minutes past the hour, even if the CPU is busy with a background fetch
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- **LED Indicators**: White LED for low price and Built-in LED for connectivity remain pinned to the actual current price, even when the user is scrolling through future data on the screen
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#### Final "Sanity Check" Verdict
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**Status:** Verified. The code is safe to deploy. The transition from 15-minute intervals to the midnight rollover is now seamless. The "1 AM fetch gap" that plagues most electricity tickers has been successfully bypassed.
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---
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## Highlights of v6.2.4
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- **BUG FIX:** Exact-boundary display refresh bug
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- Problem: At the exact top of the hour (e.g., 20:00:00), the display automatically refreshed but showed the PREVIOUS hour's data (19:00). This happened because the "next-boundary" rounding logic in findCurrentPriceIndex() incorrectly excluded the current interval if the time was exactly on the boundary.
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- Fix: Simplified findCurrentPriceIndex() to use a robust "last entry <= now" comparison. This ensures the display transitions to the new hour instantaneously at XX:00:00.
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## Highlights of v6.2.3
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- **BUG FIX**: State-based display refresh logic
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- Problem: Screen would occasionally fail to update if the ESP32 was busy (fetching data or reconnecting WiFi) during the exact 00/15/30/45 minute mark.
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- Fix: Switched from "Event-Based" (refresh only AT minute X) to "State-Based" (refresh IF current time != last refresh time). This ensures the screen updates immediately even if the device was busy during the transition.
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## Highlights of v6.2.2
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## Highlights of v6.2.2
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- **BUG FIX**: Display blank lines issue
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- Problem: Sometimes rows 0 and 1 (current 15-min prices and current hour) were blank
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