This is the documentation for the CCCB street sign internals. Here you can figure out how the electronics work, if for example the magic smoke escaped and you need to fix it. It also describes how the firmware works and has a backup of a working state.
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The Microcontroller used is a [Olimex ESP32-POE-EA-IND](https://www.olimex.com/Products/IoT/ESP32/ESP32-POE/open-source-hardware) which supports Ethernet connectivity and POE. This simplified the power management and connectivity.
Instead of a normal level shifter, a [Diodes 74AHCT1G126](https://www.diodes.com/assets/Datasheets/74AHCT1G126.pdf) is used.
For the LEDs, WS2815 was choosen. They operate with 12V power so the strips can be as long as needed without complicated power feeds. The [LEDs](https://www.aliexpress.com/item/32961181562.html) and [power supply](https://www.aliexpress.com/item/4001260747482.html) are from [BTF Lightning](https://btf-lighting.aliexpress.com/).
If you don't trust WebUSB (and you shouldn't), get the latest firmware release from [Github](https://github.com/Aircoookie/WLED/releases). The file you need is called `WLED_0.13.3_ESP32_Ethernet.bin` (with the version being the newest). Also download the newest bootloader file. At the time of writing this is version 4. You can find it [here](https://github.com/Aircoookie/WLED/releases/download/v0.13.1/esp32_bootloader_v4.bin).
Then install [esptool](https://github.com/espressif/esptool). Your Distribution probably comes with it, so try `apt install esptool` or similar.
Flash it to the ESP32 with these commands:
```shell
# Erase the current flash contents (this will also delete your current config)
When this is done, the ESP32 should open a wifi called `WLED-AP`. The default password is `wled1234`. Connect to it, configure Ethernet and disable wifi. The ESP32 should receive it's designated IP address as long as the MAC address doesn't change. If it does change, tell the DHCP admins the new MAC address so they can update the static DHCP entry.
