R2D2 Alarm Clock Project Documentation  
2. Wiring & Pinout List (ESP32-C3 SuperMini) 
The Display (TM1637) 
➢ VCC → 5V 
➢ GND → GND 
➢ CLK → GPIO 20 
➢ DIO → GPIO 21 
The Audio (DFPlayer Mini YX5200) 
➢ VCC → 3.3V (*Not the 5V) 
➢ GND → GND 
➢ RX → GPIO 6 
➢ TX → GPIO 8 
➢ SPK_1 / SPK_2 → Connect directly to Speaker 
The Knob (HW-040 360 Degrees Rotary Encoder) 
➢ VCC → 5V  
➢ GND → GND 
➢ SW (Switch) → GPIO 3 
➢ DT (Data) → GPIO 4 
➢ CLK (Clock) → GPIO 5 
The LEDs 
➢ Red LED → GPIO 2 (Use 220Ω Resistor) 
➢ White LED → GPIO 7 (Use 100Ω or 220Ω Resistor) 
➢ Blue LEDs → GPIO 10 (Use 100Ω or 220Ω Resistor)