| ATmega328P / ATmega168 / ATmega8 | 1 | Main microcontroller (8-bit AVR series) |
| 100k NTC Thermistor (B3950) | 1 | Temperature sensor; check your thermistor datasheet |
| OLED 128x64 I2C | 1 | SSD1306-based I2C display for UI |
| Rotary Encoder | 1 | Used to adjust target temperature |
| Encoder Push Button | 1 | Toggles heating ON/OFF |
| Relay Module | 1 | Controls heater based on temperature |
| Resistors 10K | 1 | Pull-up for RESET pin |
| Resistors 100K | 1 | Pull-up for thermistor input |
| Breadboard / PCB | 1 | For prototyping or permanent assembly |
| LED | 1 | Power/status indicator |
| 5V Power Supply | 1 | Powers microcontroller and relay |
