IOT Device #1/100 (ESP8266 Mailbox notifier)

I want to make 100 useful IOT projects. This is the first one.

I was inspired by Mick Make’s IOT mailbox project but it was a bit too complicated for my liking with a MQTT message broker required. My project consists of:

1. Wemos ESP8266 mini
2. External antenna
3. Cables
4. Plastic box
5. Power supply (18650 battery powered)
6. Line follow sensor (simple light sensor)

I created the project is a few hours. The largest time consumer was troubleshooting WiFi connectivity. The free IFTTT service is fantastic but it is very slow. Up to 30 mins to get a notification.

The largest limitation is the notifications continue as it does not track state.

Source code is here.Source code is here.