Standalone-electricity-price-ticker/VERSION.md

Electricity Price Ticker – Version Information

Current firmware

• Version: 6.1.2
• Release date: 2026-03-11
• 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 v6.1.2

• Fix: restore proper white LED price indicator behavior on ESP32 by avoiding mixing PWM (analogWrite) and digitalWrite on the same pin.
• Fix: LED is now truly off when backlight/LED gating turns it off (no more “dim glow”).
• Change: updateLeds() uses PWM only (analogWrite(pin, 0/255)) for off/on and blink toggles.

For full details, see:

• CHANGELOG.md
• README.md

Previous 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).

Earlier firmware

• Version: 6.0.0
• Release date: 2026-01-27
• 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 v6.0.0

• 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.