Kevin the MQTT Owl

Kevin started his life when my then flatmate found him in a bargain bin for 25p. Once the inbuilt button cell battery had depleted she let me have a play with it.

I removed the battery holder, rewired the eye LEDs, built a circuit board consisting of an ESP8266 and a DFPlayer Mini MP3 Player and hot-glued a speaker where the battery holder used to be.

Initially I simply hooked him up to our doorbell, whose 433MHz signal gets converted into MQTT messages through Sonoff’s RFBridge running the excellent Espurna firmware: