A connected greenhouse prototype built with ESP32-S3 (Heltec WiFi LoRa 32 V3) and a FreeRTOS multi-task firmware. The device reads environmental sensors, shows a local UI (OLED + rotary encoder), and enables remote monitoring and bidirectional control through MQTT → Node-RED → InfluxDB → Grafana.
The greenhouse continuously measures temperature, humidity, and light intensity and streams telemetry to the cloud. It also receives tuning commands remotely (setpoints, ranges, hysteresis, persistence) and applies them safely to the local control behavior.
The firmware is structured as independent FreeRTOS tasks rather than a single main loop. To keep the system deterministic and merge-friendly in a team environment, tasks communicate using queue-based structured messages instead of sharing global variables directly.
A major part of this project was real-world integration across modules and teammates. Common issues included I²C/library conflicts, timing/latency between tasks, and Git merge conflicts when components evolved in parallel. The queue-based architecture reduced race conditions and helped keep module interfaces clean.
ESP32-S3 (Heltec WiFi LoRa 32 V3), C/C++, FreeRTOS, GPIO, I²C
SHT31, BH1750, OLED display, rotary encoder
MQTT, Node-RED, InfluxDB, Grafana dashboards