Object Motion MITes. Emmanuel Munguia Tapia Changing Places/House_n Massachusetts Institute of Technology
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1 Object Motion MITes Emmanuel Munguia Tapia Changing Places/House_n Massachusetts Institute of Technology
2 Object motion MITes GOAL: Measure people s interaction with objects in the environment We consider that someone uses an object whenever the person has been in direct contact with the object by manipulating it either by touching, moving, or holding it.
3 Passive RFIDs
4 Passive RFIDs Problems: (1) metal objects, (2) alignment between reader and tag, (3) battery life and (4) wearable glove is intrusive
5 Magnetic Reed Switches Problems: (1) Installation is complicated and time consuming and (2) not possible to install in every object
6 Vibration/Tilt sensors Problems: (1) Sensitivity to motion cannot be adjusted and (2) orientation sensitive.
7 Summary of challenges Installation complexity Installation time Sensitivity to motion Orientation dependence Battery life Wearable technologies are intrusive
8 Object motion MITes Measure people s interaction with objects in the environment Stick-on and forget devices Single sensor (2-axis accelerometer) to measure movement, tilt, and vibration Active RFID tags that sense movement Low cost ~$29 Wireless at 2.4GHz Tx/Rx range 106m outdoors line of sight and 38m random disposition,
9 24AA320 EEPROM Memory Microstrip Antenna ADXL210 MEM Accelerometer ADXL210 MEM Accelerometer nrf24e1 MCU + Transceiver Crystal 16MHz
10 Object Motion MITes MITes measure dynamic acceleration (movement and vibration) as well as static acceleration (rotation and inclination)
11 Object Motion MITes Algorithm running inside MITes to detect movement
12 Object Motion MITes
13 Object Motion Installation
14 Object Motion Installation In some objects, RFID tags would just not work!
15 Problem 1: Adjacencies Sensors in the neighborhood of the moved sensor/object will fire We need a way to distinguish between real motion and adjacent motion Not a simple problem!
16 Classification problem: real vs. adjacent motion
17 Acceleration signal for opening a drawer 70 X normalized signal Y normalized signal Noise threshold
18 Features extracted 1.Min value above noise threshold 2.Max value above noise threshold 3.Area under curve 4.Duration of the motion (number of samples greater than the noise threshold) 5.Average of the signal 6.Variance of the signal
19 Classification algorithms Why these? They generate a set of simple decision rules that can be easily implemented as if-then clauses in a microprocessor
20 Results Best feature to use is the duration of motion. Best algorithm to use is Rules PART which generates the simple classification rule PART decision list xy_duration > 4: real xy_duration <= 3: adjacent
21 Real vs. Adjacent motion trade-off
22 Problem 2: Battery life Based on our experiments, we have found that the minimum sampling rate for distinguishing adjacencies is 10Hz At 10Hz, battery life is 46 days At 20Hz, battery life is 23 days Problem 3 false positives are high
23 Object motion MITes Piezofilm sensor WAKEUP CIRCUIT Extreme low power circuitry Sleeping (power down mode) unless motion in external sensor is detected
24 Object motion MITes New battery life is 6.3years (theoretical) but at least 1 year in practice based on measurements False positive activations is close to zero as measured over 21 days
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