ok a quick explanition of the circuit board is
The voltage between +5 VDC and GND (0 VDC) is divided between R1 (fixed resistor) and R2 (thermistor) depending on the temperature. If R1 and R2 have the same resistance they'll both have the same voltage, and the point between them will be halfway between 5 V and 0 V = 2.5 V. If R2 has a higher resistance, then the voltage at that point will be higher. If R2 has a lower resistance, then the voltage at that point will be lower. So, that's the point we want to measure with an analog-to-digital voltage pin of the ATtiny45 (IC1).
The user-adjustable potentiometer (R3) follows the same method to convert its resistance into a voltage. The first pin is connected to 5 V, the third pin is connected to 0 V, and the pin in the middle connects to another analog-to-digital voltage pin on the ATtiny45.
i am using AVR-GCC can you help me with the code please?