Difference between revisions of "F18: Catch me if you can"

Revision as of 04:48, 16 December 2018

Grading Criteria

Project Title

Catch Me If You Can

Catch me if you can

Abstract

"Catch me if you can" is a fun game where the user must be attentive and agile enough to catch the randomly dropping eggs from above into a basket with increasing difficulty levels for an intriguing experience. This is all displayed in the LED matrix acting as the screen. The system will consist of two SJ1 boards, one used as a game console with which user will try to catch the eggs by moving it in the required orientation. The other board will control the display module that displays the graphics of eggs falling and also the basket movement. The display module shall communicate with the game console via RF Nordic transceiver. There will be game sounds produced by the display module board for various events during the game like entering a new level.

Objectives & Introduction

Objective

Here, we develop an Embedded system in the form of a 2D game involving a Matrix LED display acting as the Human Machine Interface to guide the player along the way while playing the game. This project aims at integrating micro-controller peripheral drivers and the application software in a meaningful way, where the accelerometer data is sent out from a node via wireless Nordic transceiver to control slider movement on the other node to control the game according to player's performance.

Introduction

The Project consists of three main modules:

Control Module: It consists of accelerometer on SJ one board. Calibrated board orientation is sent to the Display Module via Wireless Module.

Display Module: It is responsible for controlling 32*32 LED Matrix and Piezo buzzer interfaced to SJ One Board.

Wireless Module: It is used to establish communication between Display and Control module.

About the game

• Player should collect the eggs into the basket which are shot from the canon.
• Press switch on the console (SJOne board) to start the game.
• Tilt the console left or right to move the basket.
• Collect the eggs.
• Avoid red objects, if caught Game Over, else continue to collect eggs till the end of level.

Team Members & Responsibilities

• Aquib Abduljabbar Mulani
  • Wireless chip TX driver/application and calibrating accelerometer.
• Kailash Kumar Chakravarty
  • RGB LED 32x32 matrix driver and game application code.
• Nandini Mandya Shankaraiah
  • Audio output and Wireless chip RX driver/application.
• Rishabh Sheth
  • PCB design.
• Swanand Sapre
  • Console and Game design and application code.

Schedule

Parts List & Cost

Design & Implementation

Hardware Design

Discuss your hardware design here. Show detailed schematics, and the interface here.

PCB Design

KiCAD 5.10.0 software was used for PCB design. We created two PCB's, one for LED display to connect display connector and piezo buzzers

The steps involved in the PCB design process are discussed below:

PCB Schematic Design

As a first step, we designed a circuit. We created parts which are missing in KiCAD library

Hardware Interface

Hardware Design Diagram

Hardware design diagram above gives an overview of the entire system which consists of the two SJ-One controllers: one board is used as Control Module and other board is used as the Display Module.

• The Control Module uses the onboard accelerometer on SJ-One which is interfaced via I2C protocol. The calibrated accelerometer values are then used to determine the basket position on the LED Matrix.

• The Display Module SJ-One board is used to control a 32*32 RGB LED Matrix.This matrix displays the basket, eggs shot from the cannon.The movement of the basket is as per the orientation value received from the Control Module, through Wireless Module. It also consists of Peizo buzzer which is controlled via PWM pin.

Display Module

RGB LED Matrix:

RGB LED matrix display

The Human Machine Interface is a display which is composed of 6mm pitch 1024 RGB LEDs arranged in a 32x32 matrix. 32 rows of the matrix is divided into 16 interleaved sections. Here the first section is the 1st and 16th 'row' (32 x 2 = 64 RGB LEDs), the second section is 2nd and 17th 'row' and so on. On the PCB is 12 LED driver chips. These are like 74HC595s but they have 16 outputs and they are constant current. 16 outputs * 12 chips = 192 LEDs that can be controlled at once, and 64 * 3 (R G and B) = 192. So now the design comes together. We can have 192 outputs that can control one line at a time, with each of 192 R, G and B LEDs either on or off. The LPC1758 controller selects which section to currently draw (using A, B, C and D address pins - 4 bits can have 16 values). Once the address is set, the controller clocks out 192 bits of data (24 bytes) and latches it. Then it increments the address and clocks out another 192 bits, etc until it gets to address #15, then it sets the address back to #0. To light up an individual pixel, appropriate row value is loaded on to the address pins A,B,C & D, Clock is set out to traverse the row and when required pixel is reached, the latch is set high to turn ON the LED.

Piezo Buzzer:

Piezo Schematic Diagram

Piezo Physical Diagram

Piezo electric buzzer are high performance buzzer that employ piezoelectric elements and are designed for easy incorporation into various circuits. These buzzers are designed for external excitation, the same part can serve as both a musical tone oscillator and a buzzer. In our project we are using this device to create musical tones by varying the operating frequency.The different range of operating frequency are generated from PWM peripheral. Different range of frequencies are maintained as constants ,these constants are fed to PWM,which generates square wave. The output of the PWM is driving the Piezo buzzer.

Code snippet for creating musical tones by varying frequency:

int fire[]=
{
		550,/*twice the freq of this and use always tempo as 40 */
		404,
		315,
		494,
		182,
		260,
		455,
		387,
		340
};

void fire_sound_level(void){
	 for(int i = 0;i < 8;i++)
		 {
		 	 uint8_t tempo = 40;
		 	 	 while(tempo)
		 	 	 {
					pwm.SetFrequency(fire[i]*2);
					pwm.SetDutyCycle(pwm.k2_1,50);
					pwm.PwmEnableMode(true);
					tempo--;
		 	 	 }
		 }
		 pwm.PwmEnableMode(false);
	}

Control Module

Accelerometer:

Accelerometer Detection

Code snippet for Accelerometer Calibration:

if (((x_coordiante > px_coordiante + CONSOLE_SENSITIVITY) && (x_coordiante <= CONSOLE_TILT_RANGE) ))
{
        boardOrientation=left;
        bskObj.speed=BASKET_SPEED;
        px_coordiante=x_coordiante;
}
    //left
    else if((x_coordiante<px_coordiante-CONSOLE_SENSITIVITY && x_coordiante>=-CONSOLE_TILT_RANGE))
{
        boardOrientation=right;
        bskObj.speed=BASKET_SPEED;
        px_coordiante=x_coordiante;
}
else if(x_coordiante>CONSOLE_TILT_RANGE ){
        boardOrientation=left;
        bskObj.speed=BASKET_SPEED;
}
else if(x_coordiante<-CONSOLE_TILT_RANGE ){
        boardOrientation=right;
        bskObj.speed=BASKET_SPEED;
    }
else
{
        boardOrientation=invalid;
        py_coordiante=y_coordiante;
}

Wireless Module:

Nordic Wireless Block Diagram

struct pckt
{
    int16_t x;
    int16_t y;
    int16_t z;
    int16_t buttonPressed=0;
};
void WirelessTx(void *p)
{
       while(1)
       {
           pckt var;
           var.x = AS.getX();/values from accelerometer*/
           var.y = AS.getY();
           var.z = AS.getZ();
           pckt var;
             while(1)
             {
                 if(SW.getSwitch(1))
                 {
                     var.buttonPressed=1;
                     vTaskDelay(300);
                 }
                 else if(SW.getSwitch(2))
                 {
                     var.buttonPressed=2;
                     vTaskDelay(300);
                 }
           wireless_send(REM, mesh_pkt_nack,(pckt*)&var, 8, 0);
           vTaskDelay(50);
             }
       }
}

void wirelessRx(void* p)
{
    while(1)
    {
        mesh_packet_t rcvPkt;
        int timeout_ms = 50;

        if(wireless_get_rx_pkt(&rcvPkt, timeout_ms)){

            iphObj.x_coordiante = (int16_t)(*((uint16_t*)(rcvPkt.data+0)));
            iphObj.y_coordiante = (int16_t)(*((uint16_t*)(rcvPkt.data+2)));
            iphObj.z_coordiante = (int16_t)(*((uint16_t*)(rcvPkt.data+4)));
            iphObj.buttonPressed= (int16_t)(*((uint16_t*)(rcvPkt.data+6)));
            if(iphObj.buttonPressed==1 )
            {
                xSemaphoreGive(playPauseHandler);
            }
            else if(iphObj.buttonPressed==2 )
            {
               xSemaphoreGive(resetGameHandler);
            }
        }
        vTaskDelay(50);
    }
}