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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:

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.