Spring Plan the gEEk squad Michael Cozzolino Elizabeth Reed Andrew Williams Colleen O’Hagan

2 Gantt Chart

3 Solution – System Organization Swimmer’s Eye SensingSignaling NotificationProcessing 1.Receive Data: Passive IR 2.Transmit Data to Processor 1.Receive Data from Sensor 2.Send Signal to Notification Device 1.Receive Signal from Processor 2.Activate Vibration: on stimulus

4 Sensing Technology FactorWtSensor:RFIDIRUST-B Cost 5 1 Underwater use Accuracy Range Size Ease of Use Tunable Total:

5 Sensing Timeline: Develop and Build a Test Circuit –Deadline: January 24 Test and Characterize Sensor Person Out of Water Person In Water –Deadline: February 5 Calibrate Sensor for Pool –Deadline: February 28

6 Infrared Sensors c RE200B

7 Develop Sensor Circuit Want output of the sensor to trigger device only when the swimmer is there –Immunity to noise using a low pass filter and comparator Vdd Out To processor R1R1 R2R2 C Resistor and Capacitor values determine circuit behavior Output of the sensor circuit will go to the microcontroller

8 Test and Characterize Sensor Evaluate different sensors based on criteria in Pugh chart FactorWeightPartc RE200B Operation in water5 Small3 Range5 Accuracy5 Precision5 Tunable1 Cost1 Ease of Implementation3 Total:

9 Characterize Sensors Test sensors with person outside of water to learn how they work See how changing voltage and/or pitch can change range of operation

10 Calibrate Sensor for Pool Find out how being around water affects the sensor output and compensate: –Determine exact location and orientation necessary –Determine best method of tuning the device –Use shielding to prevent sensor from sensing swimmers in adjacent lanes

11 Analyze Output Signal Approaching versus departing Multiple actuations for each turn? Gradient in output over distance Other considerations

12 Signaling Reader Processor Vibrating Motor Notification Swimmer Presence Detection Presence Status Swimmer Presence Notification Signal IR Sensor Transmitter Signal Receiver

13 Signaling Timeline: Choose Vibrating Motor –Deadline: January 23 Pick Communication Scheme –Deadline: January 17 Identify Voltage Change –Deadline: February 9/12 Transmit to Receiver –Deadline: February 9 Receiver to Buzzer –Deadline: February 16 Integrate –Deadline: February 28

14 Vibrating Motors Offset Weighted Shaft DC Coin Motor

15 Vibrating Motors Offset Weighted Shaft –All Electronics Corp. (CA) –1.5 ~ mA –0.24” dia x 0.5” long DC Coin Motor – Chongqing Linglong Electronic Co. (China) – 2.5 ~ mA – 12 mm dia x 3.4 mm thick

16 Vibrating Motors FactorWeightType Offset Weighted Shaft DC Coin Motor Small5 Vibration Strength3 Power needed3 Gradient1 Total:

17 Pick Communication Scheme Possible Devices: –RF Transmitter and Receiver –Ultrasonic Transmitter and Receiver Factor WeightType Ultrasonic RF Small Receiver5 Behavior near water5 Cost3 Total:

18 Identify Voltage Change Plan –Rising vs. falling edge –Coming vs. going Test

19 Transmit to Receiver External Stimulus Switch Transistor

20 Receiver to Buzzer Test Circuit Microcontroller through to buzzer Integrate

21 Post – Subsystems Timeline Refined Encasing on Swimmer  March 1 - March 16 Integrate Subsystems  March 1 - April 2 Build and User Interface  April 3 - April 10 Final Testing  April 11 - April 25 Filming and Documentation  April 26 - May 2