Quantity   Component name
1 × ESP8266 NodeMCU ESP12
2 × Infrared LED Kodenshi EL-1L7, wide angle, strong transmission, cheap
2 × NPN Transistor any type will do
4 × Resistor 2x 51 Ohm (for LEDs), 2x 1000 Ohm for transistors
1 × BME280 Temperature, Humidity, Pressure sensor
1 × Circuit Board blank, small
1 × Misc Female Pin Headers, dupont wires, project box, more wires