This is a humidity sensor that I designed as an alternative to the crappy ones off of Amazon.

It's powered by 4 AA batteries and an ESP32. You wake the ESP32 from sleep and turn on the screen when the touchpad next to the screen is touched.

It uses an SHT31-D humidity sensor and has a display to show the humidity levels. It can also connect to the internet and use MQTT to talk to a home server if you have one.

I ended up not using a buzzer for this project even though there is a spot for it in the design because my PCB has some errors (no flyback diode, and some other issues as well).

My code and links for the parts I used to make this project are on my github page:  https://github.com/Amm009/Humidity_Sensor

If anyone is actually interested in making this, let me know! I'd be glad to help. There are some issues that I still need to fix with the PCB anyways.

Printing Instructions:

I specifically designed this project so that it wouldn't need any supports, and it doesn't!

Supports: No*

Resolution: 0.2mm

Infill: 10-15%

Printed on a Bambu A1

*(unless you want to add some for the counterbored screw holes)