Designed a small case for my battery powered temperature logger. Used a WeMos D1 mini (ESP8266) with DHT22 sensor and WeMos battery shield. Powered by 18650 lithium battery.

Parts used:

https://de.aliexpress.com/item/ESP8266-ESP12-ESP-12-WeMos-D1-Mini-WIFI-Dev-Kit-Development-Board-NodeMCU-Lua/32653918483.html?spm=a2g0s.9042311.0.0.74wAEl
https://de.aliexpress.com/item/Wemos-D1-Mini-Battery-Shield-USB-Single-Lithium-Battery-Charging-Boost-Module-With-Pins-LED-Indicator/32796003002.html?spm=a2g0s.9042311.0.0.74wAEl
https://de.aliexpress.com/item/Carprie-New-Plastic-Battery-Case-Holder-Storage-Box-For-18650-Rechargeable-Battery-3-7V-DIY-17Jun16/32815977024.html?spm=a2g0s.9042311.0.0.SV8cdr
https://de.aliexpress.com/item/DHT-Pro-Schild-f-r-WeMos-D1-mini-DHT22-Single-bus-digitale-temperatur-und-luftfeuchtigkeit-sensormodul/32845827328.html?spm=a2g0s.9042311.0.0.SV8cdr