The ESP-01 Breakout Adapter for ESP8266 serial to Wi-Fi transceiver module. Since the ESP-01 pinout is not breadboard friendly and unlabeled, this makes it inconvenient for rapid prototyping.
The 2SK3549-01MR, 2SK3549, 2SK-3549, K3549, 3549 is a 900V 10A 270W N-Channel Power MOSFET Enhancement Mode Package Type TO-247, Manufactured By Company Fuji Electric Corp.
The HW-040 Rotary Encoder Module is a device that generates an electrical signal based on how much the rotary input device (knob) is rotated and the direction it is rotating
S9015 PNP Transistor: Low Frequency, Low Noise TO-92 S9015 Equivalents and Circuit, S9015 is a well-known PNP silicon BJT transistor. This transistor is mainly designed for low gain signal amplification.