Quantity   Component name
1 × ESP8266-01
1 × 230V Relay with 5V logic
1 × LED signal light red 230V http://www.conrad.de/ce/de/product/181953/LED-Signalleuchte-Rot-230-VAC-Mentor-26848321
1 × Photoresistor
2 × NPN Transistor
1 × 100Ω Resistor
1 × 200Ω Resistor
1 × 42kΩ Resistor