| / || _ \ ( _ )( _ \ / / | _ / | | / | | | | _ \ | | _ | |) |/ _ / _ \ | ' \ | |) | | | |/| | | | | | | | |) | | | ) | __/| () () || () | | /| | | | | | | | | | || _ < |_____|/|| _/_/ ___/ || || || ||_____| || |_____|_| _\
"Industrial-grade stability for the modern smart home." 🛠️💊
This is a high-performance, ultra-stable P1 Meter firmware for the Wemos D1 Mini / ESP8266. Re-engineered from the ground up to eliminate common ESP8266 pitfalls like heap fragmentation, buffer overflows, and serial timing drifts.
- 📊 SYSTEM TELEMETRY (v1.6.8): Advanced diagnostic dashboard with real-time Free RAM %, detailed Uptime (Days/Hours/Mins), and live IP/MAC display.
- 🔄 AUTO-REFRESH UX (v1.6.9): Synchronized real-time countdown timer for OTA updates and reboots. Automatically returns to dashboard after 35s.
- 🩹 SELF-HEALING MACHINE (v1.6.2+): Advanced state monitoring that automatically detects and fixes data stream desyncs.
- CRC Streak Guard: Resets UART if 10 bad telegrams arrive in a row.
- Stabilization Watchdog: Force-recovers if the device is stuck "Stabilizing" for more than 5 mins.
- Wedge Protection: Silently re-inits the serial port if no data is seen for 60s.
- 🛡️ CONFIG GUARD (v1.6.4): Protects WiFi settings from accidental wipes. The Double Reset Detector (DRD) only triggers on manual (External) reboots and is immediately closed once WiFi is connected.
- 📊 PERSISTENT REBOOT COUNTER (v1.6.3): Tracks reboots since the last hard power cycle using RTC SRAM. Perfect for identifying unstable firmware or OTA update cycles without physical access.
- 🎯 INDUSTRIAL PRECISION: Uses high-speed Scaled Integers (x1000) instead of slow software floats. Provides 100% accurate Voltage, Current, and Gas readings without CPU overhead.
- 🛡️ BULLETPROOF BOOT v2: UART initialization is delayed until the absolute end of setup. Automated hardware buffer purging ensures a clean start, preventing the "Stabilizing" lock.
- 🔋 POWER STABILITY: Fixed brownout issues by implementing
WIFI_NONE_SLEEPmode and spreading MQTT publishes with 50ms delays. - 🧠 ANTI-FRAG ENGINE: Zero dynamic memory allocations (
String/vector) in the main loop. Prevents "Swiss cheese" heap fragmentation. - 🌐 HACKER 2026 OTA (v1.6.5): Custom, lightweight firmware update portal at
/update. No external dependencies, one-button firmware flashing, and protected by HTTP Basic Auth (Username:admin). - 🏠 PRO HOME ASSISTANT INTEGRATION:
- Dynamic Auto-Discovery: Only registers the sensors your specific meter actually broadcasts.
- Advanced Diagnostics: Native reporting of MAC Address, Board Type, Firmware Version, MQTT Broker info, and Reboot Count.
Connect your ESP8266 to an RJ11 cable following these diagrams.
Recommended for most setups. A 10K resistor is often required between 3.3V and the Data (RXD) pin for signal stability.
| P1 pin | ESP8266 Pin | Notes |
|---|---|---|
| 2 - RTS | 3.3v | Request to Send (Activates Port) |
| 3 - GND | GND | Ground |
| 5 - RXD | RX (GPIO3) | Data (10K pullup to 3.3V recommended) |
If your meter supports DSMR 5.0, it can power the ESP8266 directly via Pin 1 (Max 250mA).
| P1 pin | ESP8266 Pin | Notes |
|---|---|---|
| 1 - 5V out | 5V / VIN | Power from Meter |
| 2 - RTS | 3.3v | Request to Send |
| 3 - GND | GND | Ground |
| 5 - RXD | RX (GPIO3) | Data |
| 6 - GND | GND | Ground |
The Pro Edition provides deep system visibility within Home Assistant:
- IP & MAC Address: Fast identification on your network.
- Board Type: Detects if you are running on a Wemos D1 Mini or NodeMCU.
- MQTT Server: Shows exactly which broker and port the device is currently connected to.
- Reboot Count: Monitors software stability since the last cold boot.
- Uptime Stability: LWT state machine transitions:
offline➔stabilizing➔online.
- Open the folder in VS Code with PlatformIO.
- Click Upload. Dependencies are handled automatically.
- Open
esp8266_p1meter/esp8266_p1meter.ino. - Install libraries:
WiFiManager,PubSubClient,DoubleResetDetector,ArduinoJson(v7.0+). - Connect your board and click Upload.
- v1.6.9 - 2026-03-26: The Real-Time Refresh Update. Upgraded countdown logic to a dynamic zero-refresh script. Refined telemetry formatting.
- v1.6.8 - 2026-03-26: The Diagnostic Dashboard. Added IP, MAC, Free RAM %, and formatted Uptime. Implemented REBOOT DEVICE button with safety prompt.
- v1.6.7 - 2026-03-26: The Visual Flash Patch. Added FLASHING... pulsing overlay and auto-refresh logic. Forced header updates to prevent caching.
- v1.6.6 - 2026-03-26: The Smooth-Reboot UX. Implemented automatic page refresh/redirect after successful OTA flash.
- v1.6.5 - 2026-03-26: The Telemetry Dashboard. Added a real-time diagnostic block to the update portal. Migrated WebUI to chunked streaming.
- v1.6.4 - 2026-03-26: The Integrity Patch. Critical fixes for memory underflow during P1 parsing and NULL pointer crashes.
- v1.6.3 - 2026-03-24: The Reboot Tracker. Added persistent reboot counter in RTC memory.
- v1.6.2 - 2026-03-24: The Self-Healing Update. Automatically resets UART on CRC streak failures. ...