Price ticker v6.1.1 - lowest price indicator update

NOTE:  This version is identical to v6.1 except for the FIX: Daily lowest/highest hourly indicator (and daily average) now correctly considers ALL hourly averages, including negative values and 0.0 (which can be real prices).

CHANGELOG.md

@@ -4,6 +4,38 @@ All notable changes to this project are documented here.
 
 ---
 
+## v6.1.1 – Daily Min/Max Includes Negative & Zero Prices (2026‑03‑07)
+
+**Summary**
+
+This release fixes a bug where the **daily lowest / highest hourly price marker** ignored negative prices (and also ignored 0.0), which could cause the ticker to incorrectly mark the **lowest positive** hour as the daily minimum.
+
+### Fixed: Daily Low/High Marker Ignored Negative & Zero Prices
+
+**Problem (v6.1.0):**
+
+- In `processJsonData()` the daily min/max scan used:
+
+  - `if (hourlyAvg > 0) { ... }`
+
+- This had two side effects:
+  1. **Negative** hourly averages were completely skipped.
+  2. A true price of **0.0** was also skipped (even though 0 can be a valid market price).
+
+- Additionally, the daily average was computed as `sum / 24.0` even though hours were being skipped from `sum`, making the daily average incorrect whenever any hour was excluded.
+
+**Solution (v6.1.1):**
+
+- The min/max and average scan now:
+  - Treats an hour as valid based on **data availability** (having all 4×15‑minute entries), not based on value sign.
+  - Includes **all values** (negative, zero, positive) when computing:
+    - `lowestPriceIndex`
+    - `highestPriceIndex`
+    - `averagePrice`
+  - Computes `averagePrice` using the number of valid hours (normally 24).
+
+---
+
 ## v6.1.0 – Midnight Fetch & Market Day Fix (2026‑01‑30)
 
 **Summary**

README.md

@@ -9,8 +9,9 @@ This project is an Arduino‑IDE‑friendly firmware for the **Seeed XIAO ESP32
 - 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 6.1.0**, focusing on:
+The latest sketch implements **Version 6.1.1**, focusing on:
 
+- Version 6.1.1 fix: Correct daily **low/high hourly markers** (now includes negative and **0.0** prices).
 - Daily (not hourly) API fetching.
 - Robust **NVS storage** of daily price data.
 - Correct **CET/CEST** handling.
@@ -236,7 +237,7 @@ The LED is driven with various patterns to indicate price level; see “LED Pric
 
 ---
 
-## Firmware Features (v6.1.0)
+## Firmware Features (v6.1.1)
 
 ### Core Display & Pricing
 
@@ -260,6 +261,8 @@ The LED is driven with various patterns to indicate price level; see “LED Pric
   - `LiquidCrystal_I2C` with custom characters for:
     - Local language letters.
     - Low‑price and high‑price indicators.
+- **Daily min/max markers**:
+  - The low/high hourly indicators now consider **negative**, **0.0**, and positive prices (v6.1.1 fix).
 
 ### LED Price Signalling
 
@@ -349,7 +352,7 @@ After successful NTP time sync:
 
 ---
 
-## Daily Fetch Strategy (v6.1.0)
+## Daily Fetch Strategy (v6.1.0+)
 
 ### Goals
 

VERSION.md

@@ -2,6 +2,25 @@
 
 ## Current firmware
 
+- **Version:** 6.1.1  
+- **Release date:** 2026-03-07  
+- **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
+
+- Fix: daily **lowest/highest hourly price marker** now includes **negative** and **0.0** prices.
+- Fix: daily average is computed over the number of valid hours (instead of always dividing by 24 even when hours were skipped).
+
+For full details, see:
+
+- [CHANGELOG.md](./CHANGELOG.md)
+- [README.md](./README.md)
+
+## Previous firmware
+
 - **Version:** 6.0.0  
 - **Release date:** 2026-01-27  
 - **Target MCU:** Seeed XIAO ESP32‑C3  
@@ -19,8 +38,3 @@
   - 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.
-
-For full details, see:
-
-- [CHANGELOG.md](./CHANGELOG.md)
-- [README.md](./README.md)