Build Guidebeginner
Remote Attic Temperature Monitor with Bee Data Logger
Monitor remote attic or crawlspace temperatures over extended periods using the Bee Data Logger's ultra-low-power deep sleep mode. Logs temperature data to SD card for seasonal analysis and HVAC optimization.
Boards:ESP32-S3
Firmware:CircuitPythonArduino
Use Cases:Environmental MonitoringData LoggingHome Automation
Overview
This project uses the Bee Data Logger to monitor temperatures in hard-to-reach locations like attics, basements, crawlspaces, or outbuildings over weeks or months on a single battery charge. The ultra-low deep sleep current (~21µA) makes it ideal for long-term unattended monitoring where power outlets are unavailable.
Use Case
Understanding attic temperature patterns helps with:
- Identifying insulation problems
- Optimizing HVAC efficiency
- Detecting potential moisture/condensation issues
- Planning seasonal home maintenance
Hardware Required
- Bee Data Logger (ESP32-S3)
- I2C temperature sensor (e.g., BME280, SHT40, or TMP117 via Qwiic)
- microSD card
- LiPo battery (larger capacity recommended for multi-month monitoring)
- CR1220 coin cell for RTC backup
How It Works
- Connect a Qwiic temperature sensor to one of the two STEMMA QT ports
- Flash the DeepSleepSD example with your preferred reading interval
- Place the logger in the attic or target location
- Retrieve the SD card periodically to analyze CSV data
- The DS3231 RTC ensures accurate timestamps throughout the monitoring period
Battery Life Estimates
With a 400mAh battery and readings every 2 hours, expect approximately 1 year of operation. With a 2000mAh battery, this extends to several years of continuous logging.
