Battery-Powered E-Paper Climate Display with ESPHome (Waveshare ESP32-S3-ePaper-1.54G)

E-paper and deep sleep are a natural pairing. An e-paper panel holds its last image with no power at all, so a battery display does not need the ESP32 awake to keep a number on screen. It can wake, take a reading, paint the panel once, and sleep again for minutes at a time. This post builds exactly that: a cased, battery-powered climate display on the Waveshare ESP32-S3-ePaper-1.54G . Every 30…