Quantity   Component name
1 × Arduino Nano or Uno
1 × BC337 transistor
1 × OLED display, 128x64, SSD1306 driver, 0.96"
2 × resistor 1K
1 × 3x4 matrix keypad
1 × relay 12V
1 × diode 1N4148
1 × push-button NO
1 × LED 5mm