1. 7-Segment Display
2. DHT22
3. Pushbutton
4. 7 Resistors
5. About 22 Cables (10 for the display, 7 for the resistors, 2 push-button, 3 DHT22)

12 out of 13 of the digital pins of my arduino nano are used.

Display

I am using an common anode 7-segment display with 3 digits (2 = Full 7-Segment, 1 = 3-Segment).

Fritzing