Wireless Garage Door Sensor and Opener

Hardware

• Base-station with relay

• Wireless door sensor:

https://giphy.com/gifs/3o752bfTEIFtwjCC2I/html5

• The door sensor uses a generic window reed switch used commonly for home security (not operational yet).
• The door sensor is a separate Arduino that talks to the base-station via NRF24L01.
• RX pin on ESP8266 (ESP-01) is input for door status. HIGH = open, LOW = closed.
• GPIO2 on ESP8266 (ESP-01) is output for relay toggle signal. A change in voltage indicates toggle.
• I found that shorting the two connections on the garage door opener toggles the door.
• A simple relay (Normally Open) is used to achieve the same from Arduino.

Software

• The web page and web API are hosted on the ESP8266 including the HTML, client side JavaScript and CSS.
• The ESP8266 and Arduino communicate via The RX and GPIO2 pins on the ESP-01.
• I'm using Basic HTTP auth + SSL to reduce risk of somebody getting a hold of the door.
• The door status is uploaded to Adafruit.IO once per minute by the ESP8266.
• This IFTT applet then sends me notifications if the door has been left open: https://ifttt.com/applets/317604p-if-the-door-is-opened-send-me-a-notification

High Level Data Flow

Web -> Relay

web toggle button -> nginx -> esp8266-webserver -> Arduino (1) -> relay to short the garage door button

Door status -> Web

Door sensor -> Arduino (2) -> NRF24L01 -> Arduino (1) -> esp8266-webserver -> nginx -> web door status