Quantity   Component name
3 × DHT22 temperature and humidity sensor
1 × Arduino Uno R3
3 × LED green 5mm 2.1 V forward resistance
1 × 1 K Ohm current limiting resistor
2 × ADAFRUIT 0.56" 4-DIGIT 7-SEGMENT DISPLAY W/I2C BACKPACK - RED
1 × SPDT toggle switch
1 × Generic Momentary Switch
1 × 9 V battery clip
1 × Sandwich, er project, box
11 × male/male jumpers
1 × 11 pin female header Connectors and Accessories / Audio and Video Connectors
3 × 4 pin female header
4 × 3 pin female header
1 × 2 pin female header
1 × 20 x 30 single sided perf board
1 × 12 x 12 single sided perf board
1 × strip of male headers for "connectors"
1 × lots of 22 gauge insulated copper wire (stranded or solid)