Based on RPi-Pico-W HW.
For hardware used, see here:
https://www.raspberrypi.com/documentation/microcontrollers/raspberry-pi-pico.html
Mounted in a Raspberry PI PICO Breakout Board with Pin Header: https://www.amazon.com/gp/product/B091F7YSCD
Sensor: https://www.amazon.com/LIZZOT-Temperature-Humidity-CJMCU-680-Development/dp/B0BVLXXXMM/
Alternative sensor: https://www.amazon.com/BME280-Environmental-Sensor-Temperature-Atmospheric/dp/B088HJHJXG/
This is run with Home-assistant: https://www.home-assistant.io/
and the ESPHome integration: https://esphome.io/