Quantity   Component name
1 × NodeMCU V3 $2.50 USD AliExpress / ebay
1 × 6vdc Power adapter $3.00 USD AliExpress / ebay
1 × Hammond 1591LSBK Polycarbonate Box $3.50 USD AliExpress / ebay
1 × DHT22 $2.50 USD AliExpress / ebay
1 × 2N3904 NPN transistor To have more strong IR signal !
1 × IR LED
7 × Dupont cables