Quantity   Component name
1 × PSU 5V@1A
1 × 550 Ohm resistor
1 × 1 kOhm resistor
5 × 2 pin screwdown connector 0.1 inch spacing (2.54mm)
1 × 1N4001 diode
1 × TIP 120 NPN transistor TO220
1 × LD1117 Voltage Regulator Fixed 3.3V, TO220
1 × ESP8266-12e 12/12e - both are fine
1 × 2 bit dip switch
1 × SRD-05VDC-SL-C Relay
1 × 4 pin header 2.54mm [OPTIONAL]
1 × 8 pin header 2.54mm [OPTIONAL]