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mangavalkandClaude Opus 5.5 75f677a2eb Move the Nano link to Serial2, update READMEs

- ESP32 talks to the Nano on UART2 (GPIO 17 TX / GPIO 16 RX); Serial (USB)
  is now free for debug output and boot messages no longer reach the Nano
- README: wiring table, actual schedule (clock from 08:00), TODO section
  for the rewiring

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

2026-10-13 00:16:24 +02:00

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ESP32: controller

PlatformIO environments: esp32 (OTA) and esp32_usb (USB)

The ESP32 decides what is shown on the display. It never touches the panel itself. The BROSE9323 driver is built with -D ESPSERIAL, so every GFX call is sent to the Nano over Serial2 (UART2, GPIO 17 TX / GPIO 16 RX, 115200 baud). Serial (USB) is only used for debug output. Wiring is described in the main README.

Files

File	Contents
`main.cpp`	setup, OTA, clock / power logic, Home Assistant callbacks
`libs.h`	includes and global objects (display, MQTT, WiFi, pins, timezone)
`bitmaps.h`	1-bit bitmaps (Pikachu, thought bubble, Nintendo logo, ...)
`secrets.example.h`	template for `secrets.h` (WiFi and MQTT credentials, gitignored)

Features

OTA updates through ArduinoOTA. Hostname: FlipDotDisplay.
OTA panic window: after a crash or watchdog reset, the ESP32 runs only the OTA handler for 15 seconds before it starts the main code. A firmware that crashes on boot can still be replaced over the air.
NTP time with timezone CET-1CEST,M3.5.0,M10.5.0/3 (Europe/Amsterdam).
Home Assistant through MQTT (home-assistant-integration library) with two switches:
- FlipDotDisplayClock: clock on, or the Nintendo logo when off
- FlipDotDisplayPower: turns the display off through the relay
Relay on GPIO 13 switches the power for both the panels and the Nano. LOW turns it on.
- On: the ESP waits for the Nano's READY message, at most 3 s (NANO_BOOT_TIMEOUT), before it sends frames. The relay stays on while it is needed; the ESP only waits when it actually switches the relay on.
- Off: the ESP stops sending and releases its TX pin (Serial.end() and the pin set to input). An idle UART line is high and would otherwise power the Nano through its RX pin.
Status LED (built-in) blinks fast when WiFi is down and slowly when connected. It is off at night or when the display is powered off.

Schedule

Time	Display
08:00 – 17:00	Pikachu and the clock, updated every minute
17:00 – 22:00	Yawning Pikachu and the clock
22:00 – 23:30	Clock shown only during the minutes :00, :15, :30 and :45; power is off in between
23:31 – 08:00	Screen cleared, power off

Adding bitmaps

Convert an image with image2cpp to "Arduino code", horizontal, 1 bit per pixel. Paste the array into bitmaps.h and draw it with display.drawBitmap(x, y, bitmap, w, h, 1). The display is 84 × 19 pixels.

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