Cricket Ball Line and Length Tracker Chris Chester.
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Transcript of Cricket Ball Line and Length Tracker Chris Chester.
![Page 1: Cricket Ball Line and Length Tracker Chris Chester.](https://reader035.fdocuments.in/reader035/viewer/2022062315/5697c00d1a28abf838cc935f/html5/thumbnails/1.jpg)
Cricket Ball Line and Length TrackerChris Chester
![Page 2: Cricket Ball Line and Length Tracker Chris Chester.](https://reader035.fdocuments.in/reader035/viewer/2022062315/5697c00d1a28abf838cc935f/html5/thumbnails/2.jpg)
Corridor of Uncertainty
corridor of uncertainty: PitchVision (2011)
Just outside the offstump
Pitched 3/4 of the way down the pitch
Hard to for a batsman to play
![Page 3: Cricket Ball Line and Length Tracker Chris Chester.](https://reader035.fdocuments.in/reader035/viewer/2022062315/5697c00d1a28abf838cc935f/html5/thumbnails/3.jpg)
1st Design : Using Pressure Sensor Pad
Issues:• Bulky – would alter the trajectory of the ball• Costly – Pads cost more than $40 each
![Page 4: Cricket Ball Line and Length Tracker Chris Chester.](https://reader035.fdocuments.in/reader035/viewer/2022062315/5697c00d1a28abf838cc935f/html5/thumbnails/4.jpg)
The ball causes the distance to decrease
Therefore the
capacitance will increase
2nd Design : Using Capacitive Pad
d
d
![Page 5: Cricket Ball Line and Length Tracker Chris Chester.](https://reader035.fdocuments.in/reader035/viewer/2022062315/5697c00d1a28abf838cc935f/html5/thumbnails/5.jpg)
Calculating Capacitance Microcontroller
used to detect capacitance
Uses RC time constant
• Set up internal clock to count ticks
Internal
![Page 6: Cricket Ball Line and Length Tracker Chris Chester.](https://reader035.fdocuments.in/reader035/viewer/2022062315/5697c00d1a28abf838cc935f/html5/thumbnails/6.jpg)
Detecting Changing Capacitance
Calibrate the Pad Look for Change in
amount of ticks Activate feedback Recalibrate
50
100 𝜇𝑠
300
![Page 7: Cricket Ball Line and Length Tracker Chris Chester.](https://reader035.fdocuments.in/reader035/viewer/2022062315/5697c00d1a28abf838cc935f/html5/thumbnails/7.jpg)
Observations and Future Considerations Effective Cheap Thin Multiple Uses
• Better interface to the bowler
• Remove alligator clips
![Page 8: Cricket Ball Line and Length Tracker Chris Chester.](https://reader035.fdocuments.in/reader035/viewer/2022062315/5697c00d1a28abf838cc935f/html5/thumbnails/8.jpg)
Conclusions Pressure Mat had several issues Capacitive Sheet was a cheap, thin
solution. Utilised the Capacitive sensing function
of the microcontrollers Offers several different alternatives
![Page 9: Cricket Ball Line and Length Tracker Chris Chester.](https://reader035.fdocuments.in/reader035/viewer/2022062315/5697c00d1a28abf838cc935f/html5/thumbnails/9.jpg)
Extra Info PIC16F1827 by Microchip Speed = 250kHz Cost is about $7 W/O LEDs