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);

}

MicroPython, Raspberry Pi Pico

Control NeoPixel Array With Infrared IR Remote Control on Raspberry Pi Pico in MicroPython

July 17, 2024 admin

In this lesson we show how we can control the neoPixel array using an Infrared IR Remote Control on the Raspberry Pi Pico W in micropython. The video above explains things step-by-step. For your convenience, the code is included below. Enjoy!

import neopixel
from machine import Pin
import time

pixPin = 0
pixSize = 8
pix = neopixel.NeoPixel(Pin(pixPin), pixSize)

def getRGB(deg):
    m=1/60
    if deg>=0 and deg<60:
        R=1
        G=0
        B=m*deg
    if deg>=60 and deg<120:
        R=1-m*(deg-60)
        G=0
        B=1
    if deg>=120 and deg<180:
        R=0
        G=m*(deg-120)
        B=1
    if deg>=180 and deg<240:
        R=0
        G=1
        B=1-m*(deg-180)
    if deg>=240 and deg<300:
        R=m*(deg-240)
        G=1
        B=0
    if deg>=300 and deg<360:
        R=1
        G=1-m*(deg-300)
        B=0
    myColor=(int(R*255),int(G*255),int(B*255))
    return myColor

from ir_rx.print_error import print_error
from ir_rx.nec import NEC_8
import SERVO
IRdict ={69 : 'POWER', 70: 'MODE',71 : 'OFF',
         68: 'PLAY', 64 : 'BACK', 67 : 'FORWARD', 7: 'ENTER', 21: '-',
         9 : '+', 22 : 0,25 : 'LOOP', 13:'USD' ,
         12: 1, 24 : 2,94 : 3,
        8 :4, 28 : 5, 90 : 6,
        66 : 7, 82 : 8, 74 : 9}

newCommand=[]
beginRecord=False
cmdReady=False
angleString=''
newBit=""
irPin=17
cmd=0
myIR = Pin(irPin, Pin.IN)
def callback(IRbit, addr, ctrl):
    global newCommand
    global beginRecord
    global cmdReady
    global IRdict
    global cmd
    if IRbit==69:
        beginRecord=True
        newCommand=[]
        cmdReady=False
    if beginRecord==True and IRbit!=-1:
        newCommand.append(IRdict[IRbit])
    if IRbit==7:
        cmdReady=True
        cmd=newCommand[1]
        
IR = NEC_8(myIR, callback)  # Instantiate receiver
try:
    while True:
        if cmd==0:
            for i in range(0,8):
                pix[i]=[0,0,0]
            pix.write()
        if cmd==1:
            pix.fill([255,0,0])
            pix.write()
        if cmd==2:
            pix.fill([0,255,0])
            pix.write()
        if cmd==3:
            pix.fill([0,0,255])
            pix.write() 
        if cmd==4:
            for i in range(0,360,1):
                for j in range(0,8,1):
                    deg=i+(j)*45
                    if deg>=360:
                        deg=deg-360
                    color=getRGB(deg)
                    pix[j]=color
                    if cmd!=4:
                        break
                if cmd!=4:
                    break
                pix.write()
                time.sleep(.01)
        if cmd==5:
            for i in range(0,360,1):
                color=getRGB(i)
                pix.fill(color)
                pix.write()
                time.sleep(.01)
                if cmd!=5:
                    break
        if cmd==6:
            for i in range(1,8,1):
                pix.fill([255,0,0])
                pix[i]=[0,0,255]
                #pix[7-i]=green
                pix.write()
                time.sleep(.1)
                if cmd!=6:
                    break
            for i in range(6,-1,-1):
                pix.fill([255,0,0])
                pix[i]=[0,0,255]
                #pix[7-i]=green
                pix.write()
                time.sleep(.1)
                if cmd!=6:
                    break

except KeyboardInterrupt:
    IR.close()
    for i in range(0,8):
        pix[i]=[0,0,0]
        pix.write()
    print("Program Terminated")

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import neopixel

from machine import Pin

import time

pixPin = 0

pixSize = 8

pix = neopixel.NeoPixel(Pin(pixPin), pixSize)

def getRGB(deg):

m=1/60

if deg>=0 and deg<60:

R=1

G=0

B=m*deg

if deg>=60 and deg<120:

R=1-m*(deg-60)

G=0

B=1

if deg>=120 and deg<180:

R=0

G=m*(deg-120)

B=1

if deg>=180 and deg<240:

R=0

G=1

B=1-m*(deg-180)

if deg>=240 and deg<300:

R=m*(deg-240)

G=1

B=0

if deg>=300 and deg<360:

R=1

G=1-m*(deg-300)

B=0

myColor=(int(R*255),int(G*255),int(B*255))

return myColor

from ir_rx.print_error import print_error

from ir_rx.nec import NEC_8

import SERVO

IRdict ={69 : 'POWER', 70: 'MODE',71 : 'OFF',

68: 'PLAY', 64 : 'BACK', 67 : 'FORWARD', 7: 'ENTER', 21: '-',

9 : '+', 22 : 0,25 : 'LOOP', 13:'USD' ,

12: 1, 24 : 2,94 : 3,

8 :4, 28 : 5, 90 : 6,

66 : 7, 82 : 8, 74 : 9}

newCommand=[]

beginRecord=False

cmdReady=False

angleString=''

newBit=""

irPin=17

cmd=0

myIR = Pin(irPin, Pin.IN)

def callback(IRbit, addr, ctrl):

global newCommand

global beginRecord

global cmdReady

global IRdict

global cmd

if IRbit==69:

beginRecord=True

newCommand=[]

cmdReady=False

if beginRecord==True and IRbit!=-1:

newCommand.append(IRdict[IRbit])

if IRbit==7:

cmdReady=True

cmd=newCommand[1]

IR = NEC_8(myIR, callback) # Instantiate receiver

try:

while True:

if cmd==0:

for i in range(0,8):

pix[i]=[0,0,0]

pix.write()

if cmd==1:

pix.fill([255,0,0])

pix.write()

if cmd==2:

pix.fill([0,255,0])

pix.write()

if cmd==3:

pix.fill([0,0,255])

pix.write()

if cmd==4:

for i in range(0,360,1):

for j in range(0,8,1):

deg=i+(j)*45

if deg>=360:

deg=deg-360

color=getRGB(deg)

pix[j]=color

if cmd!=4:

break

if cmd!=4:

break

pix.write()

time.sleep(.01)

if cmd==5:

for i in range(0,360,1):

color=getRGB(i)

pix.fill(color)

pix.write()

time.sleep(.01)

if cmd!=5:

break

if cmd==6:

for i in range(1,8,1):

pix.fill([255,0,0])

pix[i]=[0,0,255]

#pix[7-i]=green

pix.write()

time.sleep(.1)

if cmd!=6:

break

for i in range(6,-1,-1):

pix.fill([255,0,0])

pix[i]=[0,0,255]

#pix[7-i]=green

pix.write()

time.sleep(.1)

if cmd!=6:

break

except KeyboardInterrupt:

IR.close()

for i in range(0,8):

pix[i]=[0,0,0]

pix.write()

print("Program Terminated")

Technology Tutorials

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

Control NeoPixel Array With Infrared IR Remote Control on Raspberry Pi Pico in MicroPython

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