Quantity   Component name
1 × ESP8266
2 × LED 1x Red, 1x Yellow, used for error and status respectively
2 × Screw Terminal Clamps
2 × Electrolyte Capcitor 100uF One is used for voltage stabilization. The other is used to prolong the signal generated by the doorbell button
1 × Ceramic Capcitor 0.1um Used for voltage stabilization
3 × Resistors 10k ohm
2 × Resistors 22k ohm
3 × Resistors 470 ohm
1 × Resistors 330 ohm
1 × MCP1702-3302E/TO Power Management ICs / Linear Voltage Regulators and LDOs
1 × BC557 PNP BJT Discrete Semiconductors / Transistors, MOSFETs, FETs, IGBTs