Humidity regulation - Meat dryer

This is my little project for a meat drying box. The box is drilled so that the fan can blow air out of the box. This particular project is used for meat drying, however, it can be used for any switching of something via a relay, based on the actual and desired humidity. 

Based on the current humidity (DHT11 sensor) and the set desired humidity with a button, the relay switches. I have a fan connected to the relay. The circuit is 5V, for the 12V fan a DC Boost module XL6009 is used. The button switches the desired humidity by 5% from 30% to 80%. The set value is visible on the display as well as the current humidity and the current temperature. The set value remains even after switching off. (Function program included)

 Needed components: 

- Arduino Nano 

- Arduino nano shield 

- 5V relay module 

- DC boost module XL6009 

- Small soldering board 

- Display 

- Screw 1x M5x8 

- Screw 7x M3*8 

- 2x Cable grommets 

- 6x Insert M3 

- USB C connector 

- Wires 

- Plastic box 

- 12V fan 

- 8mm button 

Connection: 

Arduino Nano: 

- VIN pin to 5V 

- GND 

OLED display JMD0.96D-1: 

- VCC to 5V Arduino 

- GND - SCL to A5 pin Arduino 

- SDA to A4 pin Arduino 

DHT11 module: 

- VCC to 3.3V Arduino 

- GND 

- DATA to D2 pin Arduino 

Relay module: 

- VCC to 5V Arduino 

- GND 

- IN to D3 pin of Arduino 

Button: - D4 

Links for components (by aliexpress or other sellers): 
Button: https://www.aliexpress.com/item/4001031102114.html?spm=a2g0o.order_list.order_list_main.23.607218028KJADf

XL6009: Aliexpress

USB C connector: https://www.aliexpress.com/item/1005005919874263.html?spm=a2g0o.order_list.order_list_main.35.607218028KJADf

Relay KY-019 5V: https://www.aliexpress.com/item/1005006003912991.html?spm=a2g0o.order_list.order_list_main.64.607218028KJADf

Soldering desk (cutted 20*80mm): Aliexpress

Arduino nano Shield: https://www.aliexpress.com/item/1005001580483272.html?spm=a2g0o.order_list.order_list_main.362.607218028KJADf

Oled display 4 pin 0,96": Aliexpress

(I recommend printing on a 0.2mm layer. For meat in a different color, insert the meat after the second layer and press. (Meat printed separately in a different color and inserted when printing the lid). 

I hope you enjoy the build as much as I did and find it useful :)