Streetlight Playground

Streetlight PlaygroundA pocket-size smart city for kids, powered by ESP-NOW and RGB LED rings.I built this for a closed-off street BBQ, so the kids could ride a real mini traffic course with Dutch traffic signs and working traffic lights. The stoplights talk to each other wirelessly (ESP-NOW) and there’s a simple Wi-Fi web page on the Master to choose modes and tweak timing. Yes, it turns a quiet cul-de-sac into a civilized disco.What it does4 smart traffic lights (plus signs) that coordinate over ESP-NOW.Master web UI (open the AP and browse) to pick modes, set green-time, and brightness. See the screenshots in the gallery.Battery meter per node so you know when the “city” needs a pit stop.Modes (as used in the firmware)Standby – one red LED glows (10% brightness, battery-friendly).4Stoplights Auto – cycles 1→2→3→4 with configurable green seconds.4Stoplights Manual – pick which one is green (1..4).2Stoplights Auto – classic two-way crossing; pair 1↔2 (and 3↔4 mirrors).2Stoplights Manu