This document describes Team ElectroFinder's project to create a handheld Tetris device using an Arduino Nano and MAX7219 LED matrix module. The body is made of acrylic sheets in a box shape. It uses a 3.7V Li-ion battery with charging module and buck converter. The algorithm considers Tetris shapes as arrays, checks for valid moves and rotations, and updates scores when rows are cleared. Buttons allow resetting, shifting pieces, rotating, pausing/playing, and changing speed. The device is portable with a 5-hour backup and replaceable components.

1. Electromania:
The Tetris
An ECDC Event
By Team Electrofinder

2. Table of Contents:
– Introduction
– Acknowledgement
– Construction
– Hardware
– Algorithm
– Device
– Features

3. Introduction
Team ElectroFinder
Members:
•Supriya Gorai(17605)
•Samik Das(17606)
•Shubham Kumar(17500)
College of Engineering and Management, Kolaghat, West Bengal

4. Acknowledgement
We, team ElectroFinder, are greatly thankful for providing us the opportunity to present
our project in front of such a great platform “Electromania” in your annual techfest
“Techkriti 18”.

5. Construction
the body
We used Acrolic sheets in building the device body. It is transparent so that internal
components can be easily seen. The device is given a shape of a box which is quite
handy in structure and can be opened from the backside. Nut-bolts, zip-ties and glue
are used to make the box more rigid.

6. Hardware
Components used to make the circuit
1. Arduino Nano
2. MAX 7219 Dot Led
Matrix Module 3. 3.7V Lithium Battery Cgarging
Module TP4056 with
Overcharge Protection
4. LM2596 DC-DC Buck
Converter adjustable Step up
Module Power Supply 5. Micro Switches
6. 3.7V Li-on Battery

7. Hardware
circuit explanation
We are using a charging
module in connection
with a 3.7V li-on battery.
The output of the
charging module is put
on a buck converter for
powering the Arduino
Nano and provide
required power to the
led matrix. The led
matrix is in conjugation
with IC MAX7219
forming a compact
module. We are using
Arduino Nano
microcontroller for the
model.

8. Hardware
led matrix module

9. Algorithm
Important Variable Declarations
1. All shapes and possible patterns.
2. Corresponding shapes and patterns required for rotation.
3. Delay times to control speed and threshold scores for different levels.
4. Required messages and numbers to display score.
5. Declare required pins for I/O interactions.
Consider each shape as 5X8 array
Yellow: Original Pattern
Red: Blocks involving during rotation
Corresponding array
fig - 1 for normal shape
fig - 2 for rotation
Array for letters to be displayed in message

10. Algorithm
void setup()
1. Setting shutdown mode for MAX 7219 module.
2. Setting LED matrix intensity.
3. Setting the pins to input mode.
4. Define and initialize all global variables.
5. We consider mainly two arrays to hold the current display pattern of the LED and the current
shape with column position.
• Current area
• Temporary area
Combination of these two arrays is used to decide the next pattern to be displayed
Note: Point No. 1, 2, 3 are the settings for the LED Matrix Module

11. Algorithm
The Game
1. For first time run, display the message “NEW GAME” + “LEVEL 0” and set flag to indicate
game has started.
2. Check if all blocks of a row is set to high, if yes then remove the row and update score.
3. If the score crossed threshold the next level the upgrade level , clear display, show new
level.
4. Select a random block with random position.
5. Move the block downwards till last row or other blocks present in the current pattern is
reached . While moving downwards need to check the status of the input switches and
take necessary actions –
• Reset: set the start game flag and return to main loop to restart the game. Go
to step 1.
• Right shift: Check if shift is possible.
Not crossing last column.
Not overlapping with existing patter.
If move is possible then display otherwise next action.

12. Algorithm
The Game Contd...
• Left shift: Check if shift is possible.
Not crossing first column.
Not overlapping with existing patter.
If move is possible then display otherwise next action.
•Rotation: Check if rotation is possible.
Consider the corresponding rotation pattern.
Shift the pattern to the position of current shape.
Check if this pattern is overlapping with current pattern.
If rotation is possible then select the next shape/pattern from the
shape array and display otherwise next action.
• Pause/Play: Run a loop till the switch is pressed again.
• Speed: Set the delay to lower value to increase the speed, if the switch is
released set the delay to previous value.

13. Algorithm
The Game Contd...
6. If no more downward move is possible for the current shape.
If the whole shape is not displayed then the Game is Over.
Else need to select next pattern and position. Go to step 2.
7. If the Game is Over then display message “GAME OVER” + “SCORE” + <current score>
8. Repeat display in step 7 until RESET switch is pressed.

14. Algorithm
in practical
Down
+
Rotate
Down
+
Left Shift
Down
+
Right Shift
Down
+
Pause

15. Device
Front View
Back View
Back View(Box Opened)

16. Features
• It is handy to carry.
• It has 5 hours of backup.
• Charge the battery using any micro USB type charger.
• Easy to replace damaged position.

17. Thank you.