Catch or die Project
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The project represents a game on a grid of 72 LEDs (9 rows by 8 columns) in which the player must move a light representing a platform from left to right to strategically to catch falling objects. The game is inspired from a classic game called (egg catcher) in which the player controls the position of a basket so as to catch the falling eggs. If he caught the falling egg his score increases. Otherwise, His lives decreases. The controls are two momentary push buttons. If the player successfully keeps the platform under a falling object while it is in the bottom row, the score will increment. Otherwise, the lives count will decrement. The game starts with 3 lives with the player and ends when the player loses these 3 lives. When this occurs, the game clock is disabled so the objects freeze in place on the screen and a game over flag will raise to indicate that the game is over.
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Catch or die Project
- 2. Team Members Ahmed Orabi Omar Raafat Mahmoud El-Sayed Mahmoud Eidarous Mustafa Kamel 2
- 3. Egg catcher game Inspired from egg catcher game Classic game Gain points or loss lives 3
- 4. The main idea Array of LEDs Each luminous led represents an egg Lighting and extinction of LEDs represents egg movement Basket position is represented by a row of LEDs Two seven-segment chips show the score Another seven-segment chip shows number of lives 4
- 5. The circuit Consists of seven subcircuits: 1. Random position generator 2. Display (Array of LEDs) 3. Transition bus 4. Basket position controller 5. Comparator 6. Counter and score display 7. Lives Display 5
- 6. The circuit schema 6 RPG circuit Display LEDs Transition bus Basket position Comparator Century Counter Livesdisplay
- 7. The circuit 1. Random position generator 2. Display (Array of LEDs) 3. Transition bus 4. Basket position controller 5. Comparator 6. Counter and score display 7. Lives Display 7
- 8. 1. Random position generator subcircuit Purpose: Illuminating a random led every cycle The idea depends on different transition delays Consists of three XOR gates Each of them uses the other two outputs as inputs The path of every output-to-input is different in transition delays 8
- 10. The circuit 1. Random position generator 2. Display (Array of LEDs) 3. Transition bus 4. Basket position controller 5. Comparator 6. Counter and score display 7. Lives Display 10
- 11. 2. Display subcircuit Purpose: Displaying current position to the player Consists of 64 LEDs 8 rows x 8 columns Only one led can illuminate at a time No two subsequent rows can have an illuminated LEDs An extra row of 8 LEDs represents basket position 11
- 12. The circuit 1. Random position generator 2. Display (Array of LEDs) 3. Transition bus 4. Basket position controller 5. Comparator 6. Counter and score display 7. Lives Display 12
- 13. 3. Transition bus subcircuit Purpose: Moving the position of illuminated LED to next row The idea depends on flip flop state transition Consists of either : three flip flops and a decoder for each row 8 more ICs eight flip flops for each row 8 more complex comparator (more likely to be used) 13
- 14. Transition bus schematic (feeder) 14
- 15. Transition bus schematic (flip flops) 15
- 16. The circuit 1. Random position generator 2. Display (Array of LEDs) 3. Transition bus 4. Basket position controller 5. Comparator 6. Counter and score display 7. Lives Display 16
- 17. 4. Basket position controller subcircuit Purpose: Moving the basket right or left The idea depends on an up down counter Consists of two push buttons, an up down counter and a decoder We can use a 3-bit adder and flip-flops instead of the counter The up button will be connected to the input carry the down button will be connected to all the B inputs All the A inputs are connected to the flip flops which will store the adder's last state 17
- 18. BPC schematic 18
- 19. The circuit 1. Random position generator 2. Display (Array of LEDs) 3. Transition bus 4. Basket position controller 5. Comparator 6. Counter and score display 7. Lives Display 19
- 20. 5. Comparator subcircuit Acts as a logical judge Purpose: Comparing the last row with the controlled row The output is a single bit 0/1 to fit the counter input The output is 0 if die and 1 if caught Its output is valid only if the last row has an illuminated led Can done using a set of AND & OR gates 20
- 23. The circuit 1. Random position generator 2. Display (Array of LEDs) 3. Transition bus 4. Basket position controller 5. Comparator 6. Counter and score display 7. Lives Display 23
- 24. 6.1 Counter subcircuit Purpose: Calculates the score If the comparator o/p is high, increase one Counts up in range from 0:99 The score will be displayed on two 7-segment chips It will be implemented using two subsequent 4026 Ics 24
- 25. 7490 counter 25
- 26. 7490 counter Every clock counts one Output is 4-bit BCD So output will be no more than 15 Can be used only for a decade (0:9) We need to count in a century range (0:99) 26
- 27. Alternative solution We need to display the score on two 7-segment chips 7490 IC is inadequate We can use two 4026 ICs alternatively Every clock it counts up one It produces a clock every decade Its output is the 7-segment input 27
- 28. 4026 subcircuit Every time the first IC reaches 9 the second IC counts one The clock is the comparator o/p The o/p goes to 7-segment directly No need to use 7447 (BCD to 7-segment decoder) 28
- 29. 6.2 Score display subcircuit Just take the counter output and display it on two 7-segments 29
- 30. Comparator and score display 30
- 31. The circuit 1. Random position generator 2. Display (Array of LEDs) 3. Transition bus 4. Basket position controller 5. Comparator 6. Counter and score display 7. Lives Display 31
- 32. 7. Lives display subcircuit (1) Purpose: Displays Players Lives If the comparator o/p is low and valid, decrease one Counts down in range from 3 to 0 If the o/p goes to 0 then GAME OVER We CAN use the 7490 counter here 32
- 33. 7. Lives display subcircuit (2) The Circuit uses a 7490 counter that counts UP from 0 to 3 The 1st two bits are inverted to count down from 3 to 0 When it reaches zero a game-over flag is raised and the game stops The game's clock will remain high when the player loses 33
- 35. Conclusion 35
- 36. Components Component Quantity Component Quantity Component Quantity Red LEDs 8x8 Decoders 2 PWM ICs 1 Green LEDs 8 IC 2047 2 PPM circuit 1 Push buttons 2 7490 1 4-bit adder 1 Octal flip flops 8 Green 7-seg 2 Hex not (Schmitt Triggered) 3 Quad flip flop 2 Red 7-seg 1 Double 4-input OR 3 Monostable multivibrator 1 BCD to 7Seg 1 Hex Schmitt buffer 1 Quad 2-input AND 4 Quad 2-input XOR 3 Resistors -- 36
- 38. Thank you! 38