sensing of temperature, humidity, and pressure in a mems ...€¦ · 10/26/2018 · contact...
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Contact Information: [email protected] +1 808 956 7081 direct +1 808 956 7167 department office
Sensing of temperature, humidity, and pressure in a
MEMS remote aerial payload
Undergraduate student: Matthew Nakamura
PI: Assistant Prof. Joseph J. Brown [email protected]
Office: 808 956 7081 Department Office: 808 956 7167Web: https://me.hawaii.edu/people/brown/Department of Mechanical Engineering, UH Mānoa
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Contact Information: [email protected] +1 808 956 7081 direct +1 808 956 7167 department office
Q: How can we directly sense environmental conditions in air column?
A: MEMS environmental sensor payload with independent power and data transmission.
Base station
Mobile power: 9V battery
Payload 2
Contact Information: [email protected] +1 808 956 7081 direct +1 808 956 7167 department office
8-week Design-Build-Test cycle
• 8/31 project start• 10/10 operational electronics• 10/18 casing prototyped, operation in lab• 10/25 field operation
• One undergraduate student, <$100
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Contact Information: [email protected] +1 808 956 7081 direct +1 808 956 7167 department office
Sensor
• Bosch BME280 Environmental Sensor
• $20+shipping• 1.8 µW when active• Temp: -40 to + 85 °C• Pressure: 30 – 110 kPa• Humidity: accuracy to
±3% RH• Size: 2.5 x 2.5 x 0.95
mmhttps://www.bosch-sensortec.com/bst/products/all_products/bme280https://www.amazon.com/Adafruit-BME280-Temperature-Humidity-Pressure/dp/B013W1AJUY/
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Contact Information: [email protected] +1 808 956 7081 direct +1 808 956 7167 department office
Data Handling and Transmission
• Arduino Nano microcontroller– 1.4 W at full power– $22 + shipping
• Transceiver NRF24L01, Nordic Semiconductor– 37.2 mW when in use– 2 MBps data rate– Clear line of sight
needed– 2.4 GHz channel– $12 + shipping
https://store.arduino.cc/usa/arduino-nanohttps://www.amazon.com/Longruner-NRF24L01-Wireless-Transceiver-Compatible/dp/B016PP62QO
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Contact Information: [email protected] +1 808 956 7081 direct +1 808 956 7167 department office
Combined System
Sensor
Microcontroller
Transceiver
Total mass incl. battery: 114.53 gDimensions 10 x 6.5 x 2 cmVolume: 130 cm3
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Contact Information: [email protected] +1 808 956 7081 direct +1 808 956 7167 department office
Unpackaged base station
• Transceiver NRF24L01, Nordic Semiconductor
• Arduino Uno microcontroller
• Direct connection to computer USB
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Contact Information: [email protected] +1 808 956 7081 direct +1 808 956 7167 department office
Live remote sensing operation
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Contact Information: [email protected] +1 808 956 7081 direct +1 808 956 7167 department office
With 3 toy drones, not quite enough load capacity
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Contact Information: [email protected] +1 808 956 7081 direct +1 808 956 7167 department office
Flight Test 10/25: Enough Capacity, Some Data Hiccups
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Contact Information: [email protected] +1 808 956 7081 direct +1 808 956 7167 department office
Conclusions• In 8 weeks we
prototyped and operated a mobile environmental sensing payload.
• Other sensor systems can be similarly implemented or added.
• Shrink footprint by consolidating electronics, sensors, and packaging, and by device miniaturization.
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Contact Information: [email protected] +1 808 956 7081 direct +1 808 956 7167 department office
Applied Research Themes• Interfaces: Structural, fluid,
electromagnetic• Microdevice engineering• Nanomaterial-based
fabrication
This work brought to you by: UHM Micro/Nano LabAsst. Prof. Joseph J. Brown, Ph.D. https://me.hawaii.edu/people/brown/Department of Mechanical Engineering University of Hawai‘i at Mānoa
Materials integration from fundamentals to applications
Thermoacoustic transducer made with 34 nm thick nanobridges.
Further reading:US Patent 9919921, issued March 2018.J.J. Brown et al. Nanotechnology, 2016, 27, 475504. N.T. Eigenfeld, et al. Advanced Materials, 2014, 26, 3962.
Acknowledgments:Applied Research Lab, UH MānoaMicro/Nano Group membersMechanical Engineering DepartmentMarvin Young for connection to ARL
Freestanding nano-thickness structure.
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