𝗚𝗿𝗲𝗲𝗻𝗵𝗼𝘂𝘀𝗲 𝗖𝗢₂ 𝗖𝗼𝗻𝘁𝗿𝗼𝗹𝗹𝗲𝗿 | 𝗙𝗿𝗲𝗲𝗥𝗧𝗢𝗦 𝗼𝗻 𝗥𝗮𝘀𝗽𝗯𝗲𝗿𝗿𝘆 𝗣𝗶 𝗣𝗶𝗰𝗼

Developed a 𝗖𝗢₂ 𝗳𝗲𝗿𝘁𝗶𝗹𝗶𝘇𝗮𝘁𝗶𝗼𝗻 𝗰𝗼𝗻𝘁𝗿𝗼𝗹𝗹𝗲𝗿 for a greenhouse as our 3rd-year embedded project, running on a 𝗿𝗲𝗮𝗹-𝘁𝗶𝗺𝗲 𝗼𝗽𝗲𝗿𝗮𝘁𝗶𝗻𝗴 𝘀𝘆𝘀𝘁𝗲𝗺 (𝗙𝗿𝗲𝗲𝗥𝗧𝗢𝗦). The university provided the full hardware setup and our task was to 𝗱𝗲𝘀𝗶𝗴𝗻 𝗮𝗻𝗱 𝗶𝗺𝗽𝗹𝗲𝗺𝗲𝗻𝘁 𝘁𝗵𝗲 𝘀𝗼𝗳𝘁𝘄𝗮𝗿𝗲.

The system continuously reads 𝗖𝗢₂, 𝘁𝗲𝗺𝗽𝗲𝗿𝗮𝘁𝘂𝗿𝗲, 𝗮𝗻𝗱 𝗵𝘂𝗺𝗶𝗱𝗶𝘁𝘆 𝘀𝗲𝗻𝘀𝗼𝗿𝘀, maintains the CO₂ level at a user-defined setpoint, and stores it in EEPROM. When CO₂ drops below the setpoint, the system 𝗶𝗻𝗷𝗲𝗰𝘁𝘀 𝗖𝗢₂. When it exceeds the limit, it 𝗶𝗻𝗰𝗿𝗲𝗮𝘀𝗲𝘀 𝘃𝗲𝗻𝘁𝗶𝗹𝗮𝘁𝗶𝗼𝗻. Initially tested on a simulator, it ran perfectly on real hardware without any code modifications.

Implemented 𝘀𝗲𝗻𝘀𝗼𝗿 𝗰𝗼𝗺𝗺𝘂𝗻𝗶𝗰𝗮𝘁𝗶𝗼𝗻, 𝗰𝗼𝗻𝘁𝗿𝗼𝗹 𝗹𝗼𝗴𝗶𝗰, and an 𝗢𝗟𝗘𝗗-𝗯𝗮𝘀𝗲𝗱 𝘂𝘀𝗲𝗿 𝗶𝗻𝘁𝗲𝗿𝗳𝗮𝗰𝗲 with buttons for adjusting and confirming 𝗖𝗢₂ 𝘀𝗲𝘁𝗽𝗼𝗶𝗻𝘁𝘀.

⚙️ Tech Specs:

• MCU: Raspberry Pi Pico (RP2040)
• RTOS: FreeRTOS
• Sensors: CO₂ (Vaisala GMP252), RH/T (Vaisala HMP60)
• Communication: Modbus
• Storage: EEPROM (persistent settings)

Simulator

Display

Greenhouse