Rock Paper Scissors Machine - Revision history

Chris Carhart: /* Fingers */

2009-03-20T04:59:36Z

Fingers

Chris Carhart: /* Overview */

2009-03-20T04:58:22Z

Overview

Chris Carhart: /* Overview */

2009-03-20T04:58:02Z

Overview

Chris Carhart: /* PIC interpretation of the input signal */

2009-03-20T04:56:52Z

PIC interpretation of the input signal

Chris Carhart: /* PIC interpretation of the input signal */

2009-03-20T04:56:34Z

PIC interpretation of the input signal

Chris Carhart: /* PIC interpretation of the input signal */

2009-03-20T04:56:17Z

PIC interpretation of the input signal

Chris Carhart: /* PIC interpretation of the input signal */

2009-03-20T04:55:49Z

PIC interpretation of the input signal

Chris Carhart: /* PIC interpretation of the input signal */

2009-03-20T04:55:36Z

PIC interpretation of the input signal

Chris Carhart: /* Detailed Description of Glove Operation */

2009-03-20T04:54:27Z

Detailed Description of Glove Operation

Chris Carhart: /* Analog to digital conversion */

2009-03-20T04:51:41Z

Analog to digital conversion

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 *If the player throws paper, neither of the flex sensors will be bent.
 These three combinations are enough to send three unique signals to the PIC.
+<br><Br><br><br>
 ====Flex sensors====

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 ==Overview==
 [[Image:rps_whole_thing.JPG|thumb|250px|Entire assembly|right]]
-We have created a machine that will play a fully functioning, intuitive game of [http://en.wikipedia.org/wiki/Rock-paper-scissors Rock/Paper/Scissors] (abbreviated as RPS) with a user. The machine is represented by a human-like hand, capable of seperate and independant wrist, arm, finger and thumb motion. The players' hand goes into a glove equipped with flex sensors, which wirelessly transmits data to the machine based on what the player chose. The machine then reads this data, randomly chooses a throw of its own, and displays what the machine threw, what the human threw, total win/loss/tie info, and winner/loser both on an [http://en.wikipedia.org/wiki/Lcd LCD] screen and in the form of a thumbs up/down/side motion. Video of the machine in action can be found [http://www.example.com here.]<br><br><br><br><br><br><br><br><br>
+We have created a machine that will play a fully functioning, intuitive game of [http://en.wikipedia.org/wiki/Rock-paper-scissors Rock/Paper/Scissors] (abbreviated as RPS) with a user. The machine is represented by a human-like hand, capable of seperate and independant wrist, arm, finger and thumb motion. The players' hand goes into a glove equipped with flex sensors, which wirelessly transmits data to the machine based on what the player chose. The machine then reads this data, randomly chooses a throw of its own, and displays what the machine threw, what the human threw, total win/loss/tie info, and winner/loser both on an [http://en.wikipedia.org/wiki/Lcd LCD] screen and in the form of a thumbs up/down/side motion. Video of the machine in action can be found [http://www.youtube.com/watch?v=xbLNBSTTrcE here.]<br><br><br><br><br><br><br><br><br>
 ==Team Members==

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 ==Overview==
 [[Image:rps_whole_thing.JPG|thumb|250px|Entire assembly|right]]
-We have created a machine that will play a fully functioning, intuitive game of [http://en.wikipedia.org/wiki/Rock-paper-scissors Rock/Paper/Scissors] (abbreviated as RPS) with a user. The machine is represented by a human-like hand, capable of seperate and independant wrist, arm, finger and thumb motion. The players' hand goes into a glove equipped with flex sensors, which wirelessly transmits data to the machine based on what the player chose. The machine then reads this data, randomly chooses a throw of its own, and displays what the machine threw, what the human threw, total win/loss/tie info, and winner/loser both on an [http://en.wikipedia.org/wiki/Lcd LCD] screen and in the form of a thumbs up/down/side motion.<br><br><br><br><br><br><br><br><br>
+We have created a machine that will play a fully functioning, intuitive game of [http://en.wikipedia.org/wiki/Rock-paper-scissors Rock/Paper/Scissors] (abbreviated as RPS) with a user. The machine is represented by a human-like hand, capable of seperate and independant wrist, arm, finger and thumb motion. The players' hand goes into a glove equipped with flex sensors, which wirelessly transmits data to the machine based on what the player chose. The machine then reads this data, randomly chooses a throw of its own, and displays what the machine threw, what the human threw, total win/loss/tie info, and winner/loser both on an [http://en.wikipedia.org/wiki/Lcd LCD] screen and in the form of a thumbs up/down/side motion. Video of the machine in action can be found [http://www.example.com here.]<br><br><br><br><br><br><br><br><br>
 ==Team Members==

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 This table should be self explanatory.  If the PIC received the inputs as indicated on the table, then it would know what hand gesture the human had made. More about the coding can be read in the following sections.
 [[Image:Rps inputs to the pic.png|thumb|250px|left|Inputs to the PIC]]
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 [[Image:Rps pic diagram.PNG|left|PIC input diagram]]
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 [[Image:Rps pic diagram.PNG|left|PIC input diagram]]
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 ====RF System Flaws and Recommendations====

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 ====Detailed Description of Glove Operation====
 A flow chart to sequence the glove’s many operations is shown to the right.  A detailed description of each step follows.
+[[Image:Rps glove diagram.PNG|left|Glove operation diagram]]
+<br><br><br><br><br><br><br><br><br><br><br><br>
 [[Image:Rps_flex_sensor.png|thumb|250px|right|Source: http://www.ecs.umass.edu/ece/m5/images/Flex_Sensor_With_Header_L.jpg]]
 ====Fingers====
 Inside of the fingers of the glove are flex resistors as shown to the right. These are what the resistors inside of the glove’s index and ring finger look like.

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 Inside of the glove is an analog to digital converter to convert the signal from the flex resistor into a digital signal that could be sent to the PIC.  The first step is to know the resistance range of the flex resistors.  As indicated above, when the finger is unbent, the resistance is about 11 kOhms.  On average, when the finger is bent, the resistance is around 30 kOhms.  These flex resistors are placed in series with a stable resistors (6.8 kOhms).  The flex resistor and the stable resistor will act as a voltage divider as seen on the right.
 The Vin being used within the glove is 9v. R1, in this case, is the variable flex resistor. The voltage output from an unbent finger is thus about 3.4v.  The voltage output from a bent finger is thus about 1.66v.  Since this voltage swing is sufficiently large, we sent the signal into both inputs of an AND gate.  We used the Jameco 74HC08 Quad 2-Input AND gate.  Since the 3.4v and 1.66v were above and below the threshold values of this AND gate, the output of the AND gate would be high when a finger is unbent and low when a finger is bent. Since we are powering the glove with 9v, we used another voltage divider to drop the 9v to 5v to power the AND gate. A picture of the circuit can be found on the right.
+[[Image:Rps_transmitter.JPG|thumb|200px|Reciever|right]]
+<br><br><br><Br><br><br><br><Br><br><br><Br><br><br><br><br><br><Br><br><br><br><br><br><Br><br>
-<br><br><br>
 Using this method, we were successful in digitizing a signal from the fingers. This table summarizes the inputs and outputs of the system.
 [[Image:Rps voltage table.png|thumb|350px|Inputs and Outputs|left]]
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 ====Digital to serial conversion and RF transmission====