Upgrade Your "Dumb" Doorbell to a Smart One!

Tired of missing deliveries or guests because you’re in the backyard or have your headphones on? Turn your existing classic doorbell into a WiFi-connected smart notifier with this custom DIY retrofit kit! ​This setup allows you to keep the vintage look and "ding-dong" sound of your original doorbell while adding modern smartphone alerts. ​What’s Included: ​ESP8266 NodeMCU Microcontroller: The "brains" of the operation. It connects to your home WiFi to send notifications. ​Opto-Isolated Relay Module: Safely interfaces your doorbell’s electrical circuit with the microcontroller (prevents frying your electronics!). ​USB Power Block & Cable: Everything you need to keep the logic board powered up 24/7. ​Pre-Wired Lead: Simplified wiring to get you started. ​Key Features: ​Universal Compatibility: Works with most standard mechanical doorbells. ​Phone Notifications: Program it to send alerts via Telegram, Pushover, or Home Assistant whenever someone presses the button. ​No Monthly Fees: Unlike Ring or Nest, you own the hardware and the data. No subscriptions required! ​Open Source Ready: Perfect for fans of ESPHome, Tasmota, or Arduino coding. ​Condition: ​Gently used for a hobby project. Fully functional and ready for your next smart home weekend build. ​Note: This is a DIY kit. Some basic knowledge of wiring and flashing firmware (like ESPHome or WLED) is recommended to get it customized to your liking!