ESP32 + BME 280 weather station v2 - with fan

thingiverse

Outdoor Weather Station V2 with ESP32 Board and BME280 Sensor Hey Everyone, Finally, it's time to release the v2 of my little weather station. This time, it has a fan to mitigate displaying too high values when in direct sunlight. You will need the following hardware components for assembly: For the Clamp: - 2 screws M4x18 or slightly shorter (if you only have longer ones, drill through first) For the Body: - 1 screw M2x5 or longer (designed as a through hole) to hold the BME280 - 4 screws M3 to secure your fan (designed as a through hole, length depends on fan) - 1 40x40mm fan, it's designed for 10mm fan height but taller ones will fit as well For the Lid: - A few drops of plastic glue to keep it in place during windy conditions Assembly Hints: - I screwed on the BME280 with the sensor facing upwards, to avoid particles from being blown into it. - The fan is a standard 12V 40mm fan and is connected to the 3.3V on the ESP32. There's no noise at all but a steady airflow; this should be sufficient. Mine draws 50mA, which should be okay for the ESP32, since we're not using one of the GPIO pins (12mA max each) but the power supply which is fed by the overall voltage regulator on the board. - I thought about attaching Aluminum foil to the inside surfaces to prevent sunlight from affecting sensor readings. I'll test it a bit without now and see if I notice an impact when the sun comes out. - The ESP32 board sits on its own carriage with an opening below to allow various micro-USB connectors to be used; they should all fit. To keep the board in place, I used 2 very small strips of strong double-sided tape (Tesa Power Strips), but it would also stay in place without. I designed this thing on June 13 & 14, 2020, and put it outside right away. If there are changes to be made, I'll provide updates here.