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I've never done an outdoor project but you'll need some waterproof strips and a sealed container for the mcu. You can buy waterproof strips in different led densities and styles from btf lighting in amazon and aliexpress, they are completely enclosed in a flexible plastic pipe (or hose?). Be careful with your maximum brightness since the leds can't dissipate as much heat. If they stay on during daylight you might lose many pixels. For the mcu I would use a small food container to which you can add extra waterproofing. If you need extra wifi range you can use an esp 8266 with this code on it https://github.com/martin-ger/esp_wifi_repeater