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M-Pods

Page history last edited by ashley.collier@... 12 years, 4 months ago

 

M-Pods          

(skip to: user information)

 

 

      M-Pods consist of various sensors (see the chart below for more information), a low-power microprocessor, and a Bluetooth interface.  The M-Pods house carbon dioxide, carbon monoxide, total VOC, ozone, nitrogen dioxide, light, temperature, and humidity sensors.  An Atmega 168 microcontroller logs the data and manages the system.  The sensors are placed on the circuit board to receive even airflow and a fan pulls air through the device to minimize sensing latency.  These sensors must be calibrated before entering the field (in the lab), as well as, in the field.  Therefore, a comprehensive understanding of the sensors and how their readings change over time is vital to maintaining accurate data.  After data is logged on the microcontroller, it is sent to a mobile device (smart phone) using the Bluetooth interface. 

     Another important component of the M-Pod is the battery, a rechargeable 6000 mA-H lithium battery.  Sensors account for the majority of the energy usage, next the fan, and last is the Bluetooth component, although the required energy changes based upon which sensors are active.  Researchers plan to optimize the energy capabilities of M-Pods to the point where they will require charging once a day or less, a necessary step for them to be successfully used in everyday life. 

 

 

                                                                     

M-Pod (external view)                                                            M-Pod (interior view)

 

 

 

Calibration Diagram: concentrations of known gases are fed into the chamber, and the M-Pod readings are used to determine the calibrate the device to accurately read air quality 

 

 

Sensors used in the M-Pods:

 

 

Sensor  Gas Measured  Technology Links to more Info:
e2v, MICS-5525  Carbon Monoxide  Metal Oxide Semiconductor  http://www.cdiweb.com/datasheets/e2v/mics-5525.pdf
ELT, S100  Carbon Dioxide  Non-Dispersive Infrared  http://www.co2sensor.co.kr/new/eng/carbon-dioxide-module-s-100.htm 
e2v, MICS-5526 Carbon Monoxide, and VOC  Metal Oxide Semiconductor  http://www.cdiweb.com/datasheets/e2v/MICS-5526.pdf 

e2v, MICS-4514 

 Carbon Monoxide, VOC, and Nitrogen Dioxide  Metal Oxide Semiconductor  http://www.cdiweb.com/datasheets/e2v/mics-4514.pdf 
Sensirion, SHT21 Temperature, and Humidity Digital Humidity and Temperature Sensors http://www.sensirion.com/en/01_humidity_sensors/05_humidity_sensor_sht21/00_humidity_sensor_sht21.htm

 

 

 

 

User Information

 

     The M-Pods do not need to be turned on or off, but must be kept charged. The airflow intake should be kept unobstructed and near your person for accurate results.  The device can be worn on the upper arm, attached to a backpack, or on a purse strap.  The mobile device with the MAQS app must also be kept charged and in relatively close proximity to the M-Pod, as this will allow the data to transfer via the Bluetooth connection.    

 

                                    Possible Ways of Wearing the M-Pod                                   

 

 

Labeled M-Pod and the MAQS App for Mobile Devices

 

 


Return to the homepage: FrontPage

An Explanation of the Technology, Getting Started with the MAQS System (User Info)

 

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