Homematic - Temperature Sensor V2

Housing for a home-brew Homematic temperature sensor.

I did use the following components:

PCB: https://github.com/TomMajor/AskSinPP_Examples/tree/master/PCB/Sensor_PLHT
Arduino Pro Mini 3.3V: https://www.aliexpress.com/item/Free-shipping-improved-version-of-pro-mini-electronic-building-blocks-Interactive-Media-ATMEGA328P-5V-16M/1298250308.html
Battery holder: https://www.amazon.de/gp/product/B07HT39G17
Sensor BME280: https://www.aliexpress.com/item/I2C-SPI-GY-BMP280-3-3-Digital-Barometric-Pressure-Altitude-Sensor-High-Precision-Atmospheric-Module-for/32654011852.html
Radio module: https://www.aliexpress.com/item/CC1101-Wireless-Module-Long-Distance-Transmission-Antenna-868MHZ-M115/32630602112.html
Brass inserts M3x4: https://www.aliexpress.com/item/100PCS-OD-4-3-M3-3-4-5-6-8-10-12-brass-insert-nut-knurled/32793013316.html
Screws M3x20: https://www.ebay.de/itm/Senkkopfschrauben-Edelstahl-DIN-7991-M3-M12-Senkkopf-Innensechskant-A2-V2A-VA/283194144024

Firmware: https://