Arduino Piggyback on Raspberry Pi

In this system, the LM35 temperature sensor acts as the primary data-gathering component, producing an analog voltage output that is directly proportional to the ambient temperature in degrees Celsius. Because the Raspberry Pi board lacks built-in analog-to-digital converter pins, an Arduino Uno board is introduced as a dedicated measurement co-processor. The Arduino Uno's analog input pin reads the continuous voltage signal from the LM35 and converts it into a digital representation using its internal ADC. A firmware sketch running on the Arduino processes this raw digital data and transmits the calculated temperature value out through its hardware serial interface. By linking the Arduino Uno to the Raspberry Pi board using a standard USB cable, the Pi receives this serial data stream directly. On the Raspberry Pi side, software utilizing the python-serial library parses the incoming byte stream over the virtual serial port. Finally, operators can view real-time environmental metrics directly within the terminal interface using Python scripts or diagnostic tools like Minicom, establishing a dual-processor architecture where the microcontroller handles analog sensing and the single-board computer handles higher-level data presentation.