ESP8266 Community Forum

- Mon Nov 28, 2022 1:50 am #95576 looking a way to build a doorbell for my shed. i was thinking to have a batteries operated nodemcu esp8266 with a button on the the entrance door, connect to my network and then a 2nd nodemcu with a buzzer (?) start playing a chime. At the same time send a Telegram message that somebody is on my front door (in case that i am away). So it will be like this
-nodemcu (A) with button at the door
-wifi coverage
-nodemcu (B) with the chime and telegram info.

i have found the guide on how to make the info arrive to Telegram like in https://randomnerdtutorials.com/esp8266 ... -telegram/
but i have no idea how to make the nodemcu A send to nodemcu B the info and play a chime.

Any guides please?

- Mon Nov 28, 2022 3:00 am #95578 I use MQTT, however you do need an MQTT server (mine runs on a Pi). 'A' updates an MQTT topic when the doorbell rings and you can also set a 'Last Will' message so if 'A' fails (e.g battery goes flat) you can be notified. 'B' subscribes to the topic and takes suitable action when notified via MQTT.

- Mon Nov 28, 2022 6:53 am #95579 You do not need the complexity of running a MQTT server.

You can use UDP messages for Communication between two ESP8266s