Onboard the rocket was an experiment testing Exo-Brake technology. XBee was used to collect sensor data including temperature, air pressure, and 3-axis acceleration parameters. NASA is considering Exo-brakes as a possible solution for returning cargo from the International Space Station (ISS), orbiting platforms or as possible landing mechanisms in low-density atmospheres. This was one of many tests used to analyze its effectiveness, but the first to incorporate an XBee connected sensor network. If you would like to read more about the Exo-brake, check out this article.
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#include<LiquidCrystal.h>
LiquidCrystal lcd(7,6,5,4,3,2);
int row[]={A1,A0,8,9};// Defining row pins of keypad connected to Arduino pins
int col[]={10,11,12,13};//Defining column pins of keypad connected to Arduino
int i,j,lcd_count,count=1,key_id=0,flag,entry=0;// See About the Program
int col_scan;// Variable to identify a key press
char temp_press; // Variable to hold value of key press
char check[6],pass[6]; // See About the Program
void setup()
{
lcd.begin(16,2);
for(i=0;i<=3;i++)
{
pinMode(row[i],OUTPUT);
pinMode(col[i],INPUT);
digitalWrite(col[i],HIGH);
}
lcd.print("SET 5 Digit PASS");
}
/* Main Program Begins */
void loop()
{
while(entry<=4)// Password Setting Loop begins
{
SetPassword();
}
// Password Setting Loop Ends
key_id=0;
keyscan(); // Scan for a Key Press
/* Actions on Key Press begins */
if(key_id==1) // Condition to Check Key is Pressed
{
check[count]=temp_press;
count++;
/* Condition to Unlock Begins*/
if(temp_press=='A')
{
checkPassword();
if(flag==0)
{
lcd.setCursor(0,0);
lcd.print("UNLOCKED");
}else{
lcd.setCursor(0,0);
lcd.print("WRONG PASSWORD");
delay(200);
lcd.clear();
lcd.print("LOCKED");
}
count=1; // Resetting the counter variable
}
/* Condition to Unlock Ends*/
/* Condition to Change Password Begins */
else if(temp_press=='C')
{
checkPassword();
if(flag==0)
{
lcd.setCursor(0,0);
lcd.print("ENTER NEW PASS");
key_id=0;
entry=0;
}else{
lcd.setCursor(0,0);
lcd.print("WRONG PASSWORD");
}
count=1; // Resetting the counter variable
}
/* Condition to Change Password Ends */
/* Condition to LOCK Begins*/
else if(temp_press=='B')
{
lcd.setCursor(0,0);
lcd.print("LOCKED");
count=1; // Resetting the counter variable
}
/* Condition to LOCK Ends*/
}
/* Actions on Key Press Ends*/
}
/* Main Program Ends */
void SetPassword() // Subroutine to SET User Defined Password
{
keyscan();
if(key_id==1)
{
if(temp_press=='A'||temp_press=='C'||temp_press=='B') // Condition to Check for an Invalid Keypress
{
lcd.setCursor(0,0);
lcd.print("INVALID KEYS");
entry=0;
}
else
{
pass[entry]=temp_press;
}
}
key_id=0;
if(entry==5)
{
lcd.clear();
lcd.setCursor(0,0);
lcd.print("PASSWORD SET & LOCKED");
}} // Subroutine to SET Password ENDS
char keyscan()// Subroutine to Scan Keypad for a Keypress
{
for(i=0; i<=3; i++)
{
digitalWrite(row[0],HIGH);
digitalWrite(row[1],HIGH);
digitalWrite(row[2],HIGH);
digitalWrite(row[3],HIGH);
digitalWrite(row[i],LOW);
for(j=0; j<=3; j++)
{
col_scan=digitalRead(col[j]);
if(col_scan==LOW)
{
key_id=1;
entry++;
temp_press=keypress(i,j);
lcd.setCursor(lcd_count++,1);
lcd.print(temp_press);
if(temp_press=='A'||temp_press=='C'||temp_press=='B')
{
lcd_count=0;
lcd.clear();
}
delay(300);
break;
}}
}}// Subroutine to Scan Keypress Ends
char keypress(int i, int j) // Subroutine to Identify the value of Key pressed
{
if(i==0&&j==0)
{
return('1');
}
if(i==0&&j==1)
{
return('2');
}
if(i==0&&j==2)
{
return('3');
}
if(i==0&&j==3)
{
return('A');
}
if(i==1&&j==0)
{
return('4');
}
if(i==1&&j==1)
{
return('5');
}
if(i==1&&j==2)
{
return('6');
}
if(i==1&&j==3)
{
return('B');
}
if(i==2&&j==0)
{
return('7');
}
if(i==2&&j==1)
{
return('8');
}
if(i==2&&j==2)
{
return('9');
}
if(i==2&&j==3)
{
return('C');
}
if(i==3&&j==0)
{
return('*');
}
if(i==3&&j==1)
{
return('0');
}
if(i==3&&j==2)
{
return('#');
}
if(i==3&&j==3)
{
return('D');
}
} // Subroutine to identify Keypress Ends
void checkPassword() // Subroutine to Check User Input Data with SET Password
{
flag=0;
for(i=1;i<=5&&flag==0;i++)
{
if(check[i]==pass[i])
{
flag=0;
}
else
{flag=1;
}}} // Subroutine to check password ends
int row[]={6,7,8,9};// Defining row pins of keypad connected to Aeduino pins
int col[]={10,11,12,13};//Defining column pins of keypad connected to Arduino
int i,j; // Two counter variables to count inside for loop
int col_scan; // Variable to hold value of scanned columns
void setup()
{
Serial.begin(9600);
for(i=0;i<=3;i++)
{
pinMode(row[i],OUTPUT);
pinMode(col[i],INPUT);
digitalWrite(col[i],HIGH);
} }
void loop()
{
for(i=0; i<=3; i++)
{
digitalWrite(row[0],HIGH);
digitalWrite(row[1],HIGH);
digitalWrite(row[2],HIGH);
digitalWrite(row[3],HIGH);
digitalWrite(row[i],LOW);
for(j=0; j<=3; j++)
{
col_scan=digitalRead(col[j]);
if(col_scan==LOW)
{
keypress(i,j);
delay(300);
}}
}}
void keypress(int i, int j)
{
if(i==0&&j==0)
Serial.println("1");
if(i==0&&j==1)
Serial.println("2");
if(i==0&&j==2)
Serial.println("3");
if(i==0&&j==3)
Serial.println("A");
if(i==1&&j==0)
Serial.println("4");
if(i==1&&j==1)
Serial.println("5");
if(i==1&&j==2)
Serial.println("6");
if(i==1&&j==3)
Serial.println("B");
if(i==2&&j==0)
Serial.println("7");
if(i==2&&j==1)
Serial.println("8");
if(i==2&&j==2)
Serial.println("9");
if(i==2&&j==3)
Serial.println("C");
if(i==3&&j==0)
Serial.println("*");
if(i==3&&j==1)
Serial.println("0");
if(i==3&&j==2)
Serial.println("#");
if(i==3&&j==3)
Serial.println("D");
}
int r1=6;
int r2=7;
int r3=8;
int r4=9;
int c1=10;
int c2=11;
int c3=12;
int c4=13;
int colm1;
int colm2;
int colm3;
int colm4;
void setup()
{
pinMode(r1,OUTPUT);
pinMode(r2,OUTPUT);
pinMode(r3,OUTPUT);
pinMode(r4,OUTPUT);
pinMode(c1,INPUT);
pinMode(c2,INPUT);
pinMode(c3,INPUT);
pinMode(c4,INPUT);
Serial.begin(9600);
digitalWrite(c1,HIGH);
digitalWrite(c2,HIGH);
digitalWrite(c3,HIGH);
digitalWrite(c4,HIGH);
}
void loop()
{
digitalWrite(r1,LOW);
digitalWrite(r2,HIGH);
digitalWrite(r3,HIGH);
digitalWrite(r4,HIGH);
colm1=digitalRead(c1);
colm2=digitalRead(c2);
colm3=digitalRead(c3);
colm4=digitalRead(c4);
if(colm1==LOW)
{Serial.println("1");
delay(200);}
else
{
if(colm2==LOW)
{Serial.println("2");
delay(200);}
else
{
if(colm3==LOW)
{Serial.println("3");
delay(200);}
else
{
if(colm4==LOW)
{Serial.println("A");
delay(200);}
}}}
digitalWrite(r1,HIGH);
digitalWrite(r2,LOW);
digitalWrite(r3,HIGH);
digitalWrite(r4,HIGH);
colm1=digitalRead(c1);
colm2=digitalRead(c2);
colm3=digitalRead(c3);
colm4=digitalRead(c4);
if(colm1==LOW)
{Serial.println("4");
delay(200);}
else
{
if(colm2==LOW)
{Serial.println("5");
delay(200);}
else
{
if(colm3==LOW)
{Serial.println("6");
delay(200);}
else
{
if(colm4==LOW)
{Serial.println("B");
delay(200);}
}}}
digitalWrite(r1,HIGH);
digitalWrite(r2,HIGH);
digitalWrite(r3,LOW);
digitalWrite(r4,HIGH);
colm1=digitalRead(c1);
colm2=digitalRead(c2);
colm3=digitalRead(c3);
colm4=digitalRead(c4);
if(colm1==LOW)
{Serial.println("7");
delay(200);}
else
{
if(colm2==LOW)
{Serial.println("8");
delay(200);}
else
{
if(colm3==LOW)
{Serial.println("9");
delay(200);}
else
{
if(colm4==LOW)
{Serial.println("C");
delay(200);}
}}}
digitalWrite(r1,HIGH);
digitalWrite(r2,HIGH);
digitalWrite(r3,HIGH);
digitalWrite(r4,LOW);
colm1=digitalRead(c1);
colm2=digitalRead(c2);
colm3=digitalRead(c3);
colm4=digitalRead(c4);
if(colm1==LOW)
{Serial.println("*");
delay(200);}
else
{
if(colm2==LOW)
{Serial.println("0");
delay(200);}
else
{
if(colm3==LOW)
{Serial.println("#");
delay(200);}
else
{
if(colm4==LOW)
{Serial.println("D");
delay(200);}
}}}
}
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| Fritzing project |
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| Schemetic diagram |
“Our approach is to provide open platforms to help accelerate the development of IoT for our customers, developers, and end users” said Curtis Sasaki, Vice President of Ecosystem, Samsung Electronics. “Being part of Arduino’s Certified Program helps millions of developers familiar with Arduino IDE to take advantage and focus all of their energy to building new and innovative products.”
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| Fritzing project |
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| Schemetic diagram |
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| Blink Code or Simply pastes this code in your file and upload this one. /* Blink Turns on an LED on for one second, then off for one second, repeatedly. This example code is in the public domain. */ // Pin 13 has an LED connected on most Arduino boards. // give it a name: int led = 13; // the setup routine runs once when you press reset: void setup() { // initialize the digital pin as an output. pinMode(led, OUTPUT); } // the loop routine runs over and over again forever: void loop() { digitalWrite(led, HIGH); // turn the LED on (HIGH is the voltage level) delay(1000); // wait for a second digitalWrite(led, LOW); // turn the LED off by making the voltage LOW delay(1000); // wait for a second } |