You have an ESP8266 board like the Wemos D1 ... and maybe a pushbutton – the Fritzing diagram shows everything you’d like to know. From there, you have examples on using deep sleep, do ...

For those following along at home, [WhisleyTangoHotel] provides a hand-drawn diagram to show how everything ... Feather HUZZAH is used, but any ESP8266 would work in its place.