In this video lesson we show how to create a program that will input a list of grades, sort them into descending order, average them, and then find the high and low grades. This is a classic first year college programming assignment. We take you through it step by step. For you convenience, we include the code below.

float grades[25];
int numGrades;
int i;
String myPrompt;

float tmp;
int j;
int flag = 1;

float bucket;
float avg;
float highGrade = 0;
float lowGrade = 100;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}
void loop() {
  // put your main code here, to run repeatedly:
  Serial.println("How Many Grades? ");
  while (Serial.available() == 0) {
  }
  numGrades = Serial.parseInt();
  for (i = 0; i < numGrades; i = i + 1) {
    myPrompt = "Please Input Grade: " + String(i + 1);
    Serial.println(myPrompt);
    while (Serial.available() == 0) {
    }
    grades[i] = Serial.parseFloat();
  }
  // for (j = 0; j < numGrades - 1; j = j + 1) {
  //   for (i = 0; i < numGrades - 1 - j; i = i + 1) {
  //     if (grades[i] < grades[i + 1]) {
  //       tmp = grades[i];
  //       grades[i] = grades[i + 1];
  //       grades[i + 1] = tmp;
  //     }
  //   }
    flag=1;
    while (flag == 1) {
      flag = 0;
      for (i = 0; i < numGrades - 1; i = i + 1) {
        if (grades[i] < grades[i + 1]) {
          tmp = grades[i];
          grades[i] = grades[i + 1];
          grades[i + 1] = tmp;
          flag = 1;
        }
      }
    }
    Serial.println();
    Serial.println("Your Grades Are: ");
    for (i = 0; i < numGrades; i = i + 1) {
      Serial.println(grades[i]);
    }
    bucket = 0;
    for (i = 0; i < numGrades; i = i + 1) {
      bucket = bucket + grades[i];
    }
    avg = bucket / numGrades;
    Serial.println("Your Average is: " + String(avg));
    highGrade = 0;
    lowGrade = 100;
    for (i = 0; i < numGrades; i = i + 1) {
      if (grades[i] > highGrade) {
        highGrade = grades[i];
      }
      if (grades[i] < lowGrade) {
        lowGrade = grades[i];
      }
    }
    Serial.println("Your High Grade is: " + String(highGrade));
    Serial.println("Your Low Grade is: " + String(lowGrade));
    Serial.println();
  }

float grades[25];

int numGrades;

int i;

String myPrompt;

float tmp;

int j;

int flag = 1;

float bucket;

float avg;

float highGrade = 0;

float lowGrade = 100;

void setup() {

// put your setup code here, to run once:

Serial.begin(9600);

}

void loop() {

// put your main code here, to run repeatedly:

Serial.println("How Many Grades? ");

while (Serial.available() == 0) {

}

numGrades = Serial.parseInt();

for (i = 0; i < numGrades; i = i + 1) {

myPrompt = "Please Input Grade: " + String(i + 1);

Serial.println(myPrompt);

while (Serial.available() == 0) {

}

grades[i] = Serial.parseFloat();

}

// for (j = 0; j < numGrades - 1; j = j + 1) {

// for (i = 0; i < numGrades - 1 - j; i = i + 1) {

// if (grades[i] < grades[i + 1]) {

// tmp = grades[i];

// grades[i] = grades[i + 1];

// grades[i + 1] = tmp;

// }

flag=1;

while (flag == 1) {

flag = 0;

for (i = 0; i < numGrades - 1; i = i + 1) {

if (grades[i] < grades[i + 1]) {

tmp = grades[i];

grades[i] = grades[i + 1];

grades[i + 1] = tmp;

flag = 1;

}

Serial.println();

Serial.println("Your Grades Are: ");

for (i = 0; i < numGrades; i = i + 1) {

Serial.println(grades[i]);

}

bucket = 0;

for (i = 0; i < numGrades; i = i + 1) {

bucket = bucket + grades[i];

}

avg = bucket / numGrades;

Serial.println("Your Average is: " + String(avg));

highGrade = 0;

lowGrade = 100;

for (i = 0; i < numGrades; i = i + 1) {

if (grades[i] > highGrade) {

highGrade = grades[i];

}

if (grades[i] < lowGrade) {

lowGrade = grades[i];

}

Serial.println("Your High Grade is: " + String(highGrade));

Serial.println("Your Low Grade is: " + String(lowGrade));

Serial.println();

}

Arduino

Arduino Uno R4 WiFi LESSON 36: Finding Average of an Array of Numbers on Arduino

September 25, 2024 admin

Below is the code we develop in the video above. It inputs an array of grades, it averages the grades, and then finds the High and Low Grades.

float grades[25];
int numGrades;
int i;
String myPrompt;

float bucket;
float avg;
float highGrade = 0;
float lowGrade = 100;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}
void loop() {
  // put your main code here, to run repeatedly:
  Serial.println("How Many Grades? ");
  while (Serial.available() == 0) {
  }
  numGrades = Serial.parseInt();
  for (i = 0; i < numGrades; i = i + 1) {
    myPrompt = "Please Input Grade: " + String(i + 1);
    Serial.println(myPrompt);
    while (Serial.available() == 0) {
    }
    grades[i] = Serial.parseFloat();
  }
  Serial.println();
  Serial.println("Your Grades Are: ");
  for (i = 0; i < numGrades; i = i + 1) {
    Serial.println(grades[i]);
  }
  bucket=0;
  for (i = 0; i < numGrades; i = i + 1) {
    bucket = bucket + grades[i];
  }
  avg = bucket / numGrades;
  Serial.println("Your Average is: " + String(avg));
  highGrade=0;
  lowGrade=100;
  for (i=0;i<numGrades;i=i+1){
    if(grades[i]>highGrade){
      highGrade=grades[i];
    }
    if(grades[i]<lowGrade){
      lowGrade=grades[i];
    }
  }
  Serial.println("Your High Grade is: "+String(highGrade));
  Serial.println("Your Low Grade is: "+String(lowGrade));
  Serial.println();
}

float grades[25];

int numGrades;

int i;

String myPrompt;

float bucket;

float avg;

float highGrade = 0;

float lowGrade = 100;

void setup() {

// put your setup code here, to run once:

Serial.begin(9600);

}

void loop() {

// put your main code here, to run repeatedly:

Serial.println("How Many Grades? ");

while (Serial.available() == 0) {

}

numGrades = Serial.parseInt();

for (i = 0; i < numGrades; i = i + 1) {

myPrompt = "Please Input Grade: " + String(i + 1);

Serial.println(myPrompt);

while (Serial.available() == 0) {

}

grades[i] = Serial.parseFloat();

}

Serial.println();

Serial.println("Your Grades Are: ");

for (i = 0; i < numGrades; i = i + 1) {

Serial.println(grades[i]);

}

bucket=0;

for (i = 0; i < numGrades; i = i + 1) {

bucket = bucket + grades[i];

}

avg = bucket / numGrades;

Serial.println("Your Average is: " + String(avg));

highGrade=0;

lowGrade=100;

for (i=0;i<numGrades;i=i+1){

if(grades[i]>highGrade){

highGrade=grades[i];

}

if(grades[i]<lowGrade){

lowGrade=grades[i];

}

Serial.println("Your High Grade is: "+String(highGrade));

Serial.println("Your Low Grade is: "+String(lowGrade));

Serial.println();

}

Arduino

Arduino Uno R4 WiFi LESSON 35: Understanding and Using Arrays in Projects

September 18, 2024 admin

In this video lesson we introduce the concept of Arduino Arrays, and illustrate by writing a simple program which inputs and prints a list of grades. The code from the video above is presented below for your convenience.

float grades[25];
int numGrades;
int i;
String myPrompt;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
}
void loop() {
  // put your main code here, to run repeatedly:
  Serial.println("How Many Grades? ");
  while (Serial.available() == 0) {
  }
  numGrades = Serial.parseInt();
  for (i = 0; i < numGrades; i = i + 1) {
    myPrompt = "Please Input Grade: "+String(i+1);
    Serial.println(myPrompt);
    while (Serial.available()==0){
    }
    grades[i]=Serial.parseFloat();
  }
  Serial.println();
  Serial.println("Your Grades Are: ");
  for (i=0;i<numGrades;i=i+1){
    Serial.println(grades[i]);
  }
  for (i=0;i<numGrades;i=i+1){
  }
}

float grades[25];

int numGrades;

int i;

String myPrompt;

void setup() {

// put your setup code here, to run once:

Serial.begin(9600);

}

void loop() {

// put your main code here, to run repeatedly:

Serial.println("How Many Grades? ");

while (Serial.available() == 0) {

}

numGrades = Serial.parseInt();

for (i = 0; i < numGrades; i = i + 1) {

myPrompt = "Please Input Grade: "+String(i+1);

Serial.println(myPrompt);

while (Serial.available()==0){

}

grades[i]=Serial.parseFloat();

}

Serial.println();

Serial.println("Your Grades Are: ");

for (i=0;i<numGrades;i=i+1){

Serial.println(grades[i]);

}

for (i=0;i<numGrades;i=i+1){

}

Arduino

Using the Arduino Uno R4 Wifi to Measure Temperature and Humidity With the DHT11

August 22, 2024 admin

In this video lesson we show you how to measure temperature and humidity using the DHT11 sensor. For your convenience, we include the code below which we develop in the above video. Enjoy!

#include <DHT.h>
#define DHTPIN 11
#define DHTTYPE DHT11
DHT myDHT(DHTPIN,DHTTYPE);

int br=115200;
int setUpDelay=1000;
int measDelay=1000;

float tempC;
float tempF;
float hum;
float HIF;
float HIC;

String message;

void setup() {
  // put your setup code here, to run once:
Serial.begin(br);
myDHT.begin();
delay(setUpDelay);
}

void loop() {
  // put your main code here, to run repeatedly:
tempC=myDHT.readTemperature(false);
tempF=myDHT.readTemperature(true);
hum=myDHT.readHumidity();
if (isnan(tempC) || isnan(tempF) || isnan(hum)){
  Serial.println("Failed to Read Data on DHT11");
  return;
}
HIC=myDHT.computeHeatIndex(tempC,hum,false);
HIF=myDHT.computeHeatIndex(tempF,hum,true);
message="Temp: "+String(tempC)+" deg C "+String(tempF)+" deg F Humidity: "+String(hum)+" % Heat Index: "+String(HIC)+" deg C "+String(HIF)+" deg F.";
Serial.println(message);
// Serial.print("Temp: ");
// Serial.print(tempC);
// Serial.print(" deg C ");
// Serial.print(tempF);
// Serial.print(" deg F ");
// Serial.print("Humidity: ");
// Serial.print(hum);
// Serial.print(" % ");
// Serial.print("Heat Index: ");
// Serial.print(HIC);
// Serial.print(" deg C ");
// Serial.print(HIF);
// Serial.println(" deg F ");


delay(measDelay);
}

#include <DHT.h>

#define DHTPIN 11

#define DHTTYPE DHT11

DHT myDHT(DHTPIN,DHTTYPE);

int br=115200;

int setUpDelay=1000;

int measDelay=1000;

float tempC;

float tempF;

float hum;

float HIF;

float HIC;

String message;

void setup() {

// put your setup code here, to run once:

Serial.begin(br);

myDHT.begin();

delay(setUpDelay);

}

void loop() {

// put your main code here, to run repeatedly:

tempC=myDHT.readTemperature(false);

tempF=myDHT.readTemperature(true);

hum=myDHT.readHumidity();

if (isnan(tempC) || isnan(tempF) || isnan(hum)){

Serial.println("Failed to Read Data on DHT11");

return;

}

HIC=myDHT.computeHeatIndex(tempC,hum,false);

HIF=myDHT.computeHeatIndex(tempF,hum,true);

message="Temp: "+String(tempC)+" deg C "+String(tempF)+" deg F Humidity: "+String(hum)+" % Heat Index: "+String(HIC)+" deg C "+String(HIF)+" deg F.";

Serial.println(message);

// Serial.print("Temp: ");

// Serial.print(tempC);

// Serial.print(" deg C ");

// Serial.print(tempF);

// Serial.print(" deg F ");

// Serial.print("Humidity: ");

// Serial.print(hum);

// Serial.print(" % ");

// Serial.print("Heat Index: ");

// Serial.print(HIC);

// Serial.print(" deg C ");

// Serial.print(HIF);

// Serial.println(" deg F ");

delay(measDelay);

}

Arduino

Create a Bouncing Pixel on the Arduino Uno R4 WiFi LED Matrix

August 8, 2024 admin

In this video lesson we create a bouncing pixel on the Arduino Uno R4 LED Matrix. For your convenience we include the code developed in the video below.

#include "Arduino_LED_Matrix.h"
ArduinoLEDMatrix matrix;

int br=115200;
int dt=50;
int xPos=3;
int yPos=2;
int deltaX=1;
int deltaY=1;

int i;
int j;

byte frame[8][12];

void setup() {
  // put your setup code here, to run once:
Serial.begin(br);
matrix.begin();
}
void loop() {
  // put your main code here, to run repeatedly:
for ( i=0;i<=11;i=i+1){
  for (j=0;j<=7;j=j+1){
    frame[j][i]=0;
    if (i==xPos && j==yPos){
      frame[j][i]=1;
    }
  }
}
matrix.renderBitmap(frame,8,12);
if (xPos>=11 || xPos<=0){
  deltaX=-deltaX;
}
if (yPos>=7 || yPos<=0){
  deltaY=-deltaY;
}
xPos=xPos+deltaX;
yPos=yPos+deltaY;
delay(dt);
}

#include "Arduino_LED_Matrix.h"

ArduinoLEDMatrix matrix;

int br=115200;

int dt=50;

int xPos=3;

int yPos=2;

int deltaX=1;

int deltaY=1;

int i;

int j;

byte frame[8][12];

void setup() {

// put your setup code here, to run once:

Serial.begin(br);

matrix.begin();

}

void loop() {

// put your main code here, to run repeatedly:

for ( i=0;i<=11;i=i+1){

for (j=0;j<=7;j=j+1){

frame[j][i]=0;

if (i==xPos && j==yPos){

frame[j][i]=1;

}

matrix.renderBitmap(frame,8,12);

if (xPos>=11 || xPos<=0){

deltaX=-deltaX;

}

if (yPos>=7 || yPos<=0){

deltaY=-deltaY;

}

xPos=xPos+deltaX;

yPos=yPos+deltaY;

delay(dt);

}

Technology Tutorials

Arduino Program to Average and Sort Grades

Arduino Uno R4 WiFi LESSON 36: Finding Average of an Array of Numbers on Arduino

Arduino Uno R4 WiFi LESSON 35: Understanding and Using Arrays in Projects

Using the Arduino Uno R4 Wifi to Measure Temperature and Humidity With the DHT11

Create a Bouncing Pixel on the Arduino Uno R4 WiFi LED Matrix

Making The World a Better Place One High Tech Project at a Time. Enjoy!