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Open Arduino-Based Environmental Sensor Package for COSMOS Nodes:

Design, Integration, and Real-Time Environmental Monitoring

Week 7 Updates

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  • Humidity Test

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  • Soldered and integrated the Teensy 4.0 with header pins

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  • Migrated sensor connections from the Arduino Uno to the Teensy 4.0

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  • Troubleshot I²C communication with BMP085 and AmbiMate sensors

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Week 7 Progress

Humidity Test

TEENSY with soldered headers

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Week 7 Troubleshooting

  • Identified a power-only USB cable preventing Teensy programming and serial communication

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  • Migrated development platform from Arduino Uno to Teensy 4.0

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  • Troubleshot I²C communication during sensor migration

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  • Isolated BMP085 and AmbiMate connectivity through individual hardware testing

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  • Verified Teensy operation using USB data communication and I²C diagnostics

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Week 7 Progress

Humidity Accuracy

  • Validated the AmbiMate MS4 humidity sensor.

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  • Performed a saturated NaCl salt calibration test.

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  • Measured 71% RH (expected 75% RH).

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  • Compared AmbiMate readings with a commercial humidity meter.

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  • Ambient test: 51% RH (AmbiMate) vs. 55% RH (reference meter).

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  • Testing performed on a 95°F+, high-humidity day.

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Week 7 Progress Continued

Gas Sensor Rewiring

  • Implemented a 10 kΩ / 20 kΩ voltage divider to scale MQ sensor outputs from 5 V to 3.3 V.

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  • Integrated the voltage divider with the Teensy 4.0 ADC for safe analog input.

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  • Verified voltage scaling and updated the MQ sensor wiring schematic.

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  • Prepared the gas sensor interface for full Teensy-based environmental sensing.

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Voltage Divider

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Week 8 Agenda

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  • Integrate the remaining environmental sensors (PM, NO₂, accelerometer, and MQ gas sensors) into the Teensy 4.0 platform.

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  • Validate simultaneous operation of all sensors and resolve remaining I²C communication issues.

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  • Refine the enclosure CAD design to improve sensor placement, airflow, and internal component mounting.

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  • Finalize wiring layout and update the KiCad schematic for PCB development.

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Thanks!

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