In the video tutorial above we describe the fundamentals of Robot Motor Control Using the L298N control module. This establishes the core functions that will be used throughout the remainder of these lessons. We show how we can create the core motion components of forward, backward, turn left and turn right. The code developed in the lesson above is presented below for your convenience. If you would like to play along at home, you can get the hardware I am using HERE:

int ENA=5;
int ENB=6;
int IN1=7;
int IN2=8;
int IN3=9;
int IN4=11;
void setup() {
  // put your setup code here, to run once:
pinMode(ENA,OUTPUT);
pinMode(ENB,OUTPUT);
pinMode(IN1,OUTPUT);
pinMode(IN2,OUTPUT);
pinMode(IN3,OUTPUT);
pinMode(IN4,OUTPUT);
digitalWrite(ENA,HIGH);
digitalWrite(ENB,HIGH);
}

void loop() {
  // Right Turn
digitalWrite(IN1,HIGH);
digitalWrite(IN2,LOW);
digitalWrite(IN3,HIGH);
digitalWrite(IN4,LOW);
delay(1000);
//Left Turn
digitalWrite(IN1,LOW);
digitalWrite(IN2,HIGH);
digitalWrite(IN3,LOW);
digitalWrite(IN4,HIGH);
delay(1000);
//forward
digitalWrite(IN1,HIGH);
digitalWrite(IN2,LOW);
digitalWrite(IN3,LOW);
digitalWrite(IN4,HIGH);
delay(1000);
//backwards
digitalWrite(IN1,LOW);
digitalWrite(IN2,HIGH);
digitalWrite(IN3,HIGH);
digitalWrite(IN4,LOW);
delay(1000);
}

int ENA=5;

int ENB=6;

int IN1=7;

int IN2=8;

int IN3=9;

int IN4=11;

void setup() {

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

pinMode(ENA,OUTPUT);

pinMode(ENB,OUTPUT);

pinMode(IN1,OUTPUT);

pinMode(IN2,OUTPUT);

pinMode(IN3,OUTPUT);

pinMode(IN4,OUTPUT);

digitalWrite(ENA,HIGH);

digitalWrite(ENB,HIGH);

}

void loop() {

// Right Turn

digitalWrite(IN1,HIGH);

digitalWrite(IN2,LOW);

digitalWrite(IN3,HIGH);

digitalWrite(IN4,LOW);

delay(1000);

//Left Turn

digitalWrite(IN1,LOW);

digitalWrite(IN2,HIGH);

digitalWrite(IN3,LOW);

digitalWrite(IN4,HIGH);

delay(1000);

//forward

digitalWrite(IN1,HIGH);

digitalWrite(IN2,LOW);

digitalWrite(IN3,LOW);

digitalWrite(IN4,HIGH);

delay(1000);

//backwards

digitalWrite(IN1,LOW);

digitalWrite(IN2,HIGH);

digitalWrite(IN3,HIGH);

digitalWrite(IN4,LOW);

delay(1000);

}

Jetson Xavier NX

Jetson Xavier NX Lesson 7: Connecting and Controlling Servos

July 1, 2020 admin

In this lesson we show you how to control a pan/tilt camera bracket with the NVIDIA Jetson Xavier NX. We go through the physical build of the bracket, how to connect the circuit, and then how to program the servos. We use the Adafruit circuitpython library, and show how to download and use the library. If you want to play along at home, you can pick the pan/tilt bracket and servos up HERE, and you can grab a couple of Raspberry Pi cameras HERE.

Below is the simple code for moving the servo using the Jetson Xavier NX:

import time
from adafruit_servokit import ServoKit
kit=ServoKit(channels=16)
tilt=125
pan=0
kit.servo[0].angle=pan
kit.servo[1].angle=tilt
for i in range(0,180):
    kit.servo[0].angle=i
    time.sleep(.05)
for i in range(180,0,-1):
    kit.servo[0].angle=i
    time.sleep(.05)
for i in range(45,180):
    kit.servo[1].angle=i
    time.sleep(.05)
for i in range(180,0,-1):
    kit.servo[1].angle=i
    time.sleep(.05)

import time

from adafruit_servokit import ServoKit

kit=ServoKit(channels=16)

tilt=125

pan=0

kit.servo[0].angle=pan

kit.servo[1].angle=tilt

for i in range(0,180):

kit.servo[0].angle=i

time.sleep(.05)

for i in range(180,0,-1):

kit.servo[0].angle=i

time.sleep(.05)

for i in range(45,180):

kit.servo[1].angle=i

time.sleep(.05)

for i in range(180,0,-1):

kit.servo[1].angle=i

time.sleep(.05)

Arduino, Tutorial

ARDUINO TUTORIAL 68: Make a Remote Controlled RGB LED with Brightness and Color Control

June 30, 2020 admin

RGB LED Remote Control — This is our Remote Controlled RGB LED

In this lesson we take you through step-by-step instructions on creating a remotely controlled RGB LED. This is the solution to the Homework Assignment given in Tutorial 68. It is important for you to try and complete this on your own before looking at my solutions.

We are building this with parts from our Elegoo Kit , and our actual build is using an Arduino Nano, which allows the project to be built on a single breadboard. You can get the neat jumper wires HERE.

This video steps you through our build.

Below is the code we developed in this video.

#include <IRremote.h>
int IRpin=9;
IRrecv IR(IRpin);
decode_results cmd;
String myCom;

int rPin=6;
int gPin=10;
int bPin=5;

int rBright=255;
int gBright=255;
int bBright=255;

float dFact=1;


void setup()
{
Serial.begin(9600);
IR.enableIRIn();

pinMode(rPin,OUTPUT);
pinMode(gPin,OUTPUT);
pinMode(bPin,OUTPUT);

}

void loop() {
  while (IR.decode(&cmd)==0){ 
}
delay(1500);
IR.resume();

if (cmd.value==0xFF6897){
  myCom="zero";
  Serial.println(myCom); 
}
if (cmd.value==0xFF30CF){
  myCom="one";
  Serial.println(myCom); 
}
if (cmd.value==0xFF18E7){
  myCom="two";
  Serial.println(myCom); 
}
if (cmd.value==0xFF7A85){
  myCom="three";
  Serial.println(myCom); 
}
if (cmd.value==0xFF10EF){
  myCom="four";
  Serial.println(myCom); 
}
if (cmd.value==0xFF38C7){
  myCom="five";
  Serial.println(myCom); 
}
if (cmd.value==0xFF5AA5){
  myCom="six";
  Serial.println(myCom); 
}
if (cmd.value==0xFF42BD){
  myCom="seven";
  Serial.println(myCom); 
}
if (cmd.value==0xFF4AB5){
  myCom="eight";
  Serial.println(myCom); 
}
if (cmd.value==0xFF52AD){
  myCom="nine";
  Serial.println(myCom); 
}

if (cmd.value==0xFFA25D){
  myCom="pwr";
  Serial.println(myCom); 
}
if (cmd.value==0xFF629D){
  myCom="v+";
  Serial.println(myCom);
}
if (cmd.value==0xFFE21D){
  myCom="fun";
  Serial.println(myCom);
}
if (cmd.value==0xFF22DD){
  myCom="rew";
  Serial.println(myCom);
}
if (cmd.value==0xFF02FD){
  myCom="play";
  Serial.println(myCom);
}
if (cmd.value==0xFFC23D){
  myCom="ff";
  Serial.println(myCom);
}
if (cmd.value==0xFFE01F){
  myCom="dn";
  Serial.println(myCom);
}
if (cmd.value==0xFFA857){
  myCom="v-";
  Serial.println(myCom);
}
if (cmd.value==0xFF906F){
  myCom="up";
  Serial.println(myCom);
}
if (cmd.value==0xFF9867){
  myCom="eq";
  Serial.println(myCom);
}
if (cmd.value==0xFFB04F
){
  myCom="st";
  Serial.println(myCom);
}
if(myCom=="pwr"){
  rBright=255;
  gBright=255;
  bBright=255;
  dFact=1;
}

if(myCom=="fun"){
  rBright=0;
  gBright=0;
  bBright=0;
  dFact=0;
}
if(myCom=="zero"){
  rBright=255;
  gBright=255;
  bBright=255;
}
if(myCom=="one"){
  rBright=255;
  gBright=0;
  bBright=0;
}
if(myCom=="two"){
  rBright=0;
  gBright=255;
  bBright=0;
}
if(myCom=="three"){
  rBright=0;
  gBright=0;
  bBright=255;
}
if(myCom=="four"){
  rBright=0;
  gBright=255;
  bBright=255;
}
if(myCom=="five"){
  rBright=255;
  gBright=0;
  bBright=150;
}
if(myCom=="six"){
  rBright=255;
  gBright=255;
  bBright=0;
}
if (myCom=="dn"){
  dFact=dFact*.75;
}
if (myCom=="up"){
  dFact=dFact*1.3;
  if (dFact>1){
    dFact=1;
  }
}

analogWrite(rPin,rBright*dFact);
analogWrite(gPin,gBright*dFact);
analogWrite(bPin,bBright*dFact);
}

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#include <IRremote.h>

int IRpin=9;

IRrecv IR(IRpin);

decode_results cmd;

String myCom;

int rPin=6;

int gPin=10;

int bPin=5;

int rBright=255;

int gBright=255;

int bBright=255;

float dFact=1;

void setup()

{

Serial.begin(9600);

IR.enableIRIn();

pinMode(rPin,OUTPUT);

pinMode(gPin,OUTPUT);

pinMode(bPin,OUTPUT);

}

void loop() {

while (IR.decode(&cmd)==0){

}

delay(1500);

IR.resume();

if (cmd.value==0xFF6897){

myCom="zero";

Serial.println(myCom);

}

if (cmd.value==0xFF30CF){

myCom="one";

Serial.println(myCom);

}

if (cmd.value==0xFF18E7){

myCom="two";

Serial.println(myCom);

}

if (cmd.value==0xFF7A85){

myCom="three";

Serial.println(myCom);

}

if (cmd.value==0xFF10EF){

myCom="four";

Serial.println(myCom);

}

if (cmd.value==0xFF38C7){

myCom="five";

Serial.println(myCom);

}

if (cmd.value==0xFF5AA5){

myCom="six";

Serial.println(myCom);

}

if (cmd.value==0xFF42BD){

myCom="seven";

Serial.println(myCom);

}

if (cmd.value==0xFF4AB5){

myCom="eight";

Serial.println(myCom);

}

if (cmd.value==0xFF52AD){

myCom="nine";

Serial.println(myCom);

}

if (cmd.value==0xFFA25D){

myCom="pwr";

Serial.println(myCom);

}

if (cmd.value==0xFF629D){

myCom="v+";

Serial.println(myCom);

}

if (cmd.value==0xFFE21D){

myCom="fun";

Serial.println(myCom);

}

if (cmd.value==0xFF22DD){

myCom="rew";

Serial.println(myCom);

}

if (cmd.value==0xFF02FD){

myCom="play";

Serial.println(myCom);

}

if (cmd.value==0xFFC23D){

myCom="ff";

Serial.println(myCom);

}

if (cmd.value==0xFFE01F){

myCom="dn";

Serial.println(myCom);

}

if (cmd.value==0xFFA857){

myCom="v-";

Serial.println(myCom);

}

if (cmd.value==0xFF906F){

myCom="up";

Serial.println(myCom);

}

if (cmd.value==0xFF9867){

myCom="eq";

Serial.println(myCom);

}

if (cmd.value==0xFFB04F

){

myCom="st";

Serial.println(myCom);

}

if(myCom=="pwr"){

rBright=255;

gBright=255;

bBright=255;

dFact=1;

}

if(myCom=="fun"){

rBright=0;

gBright=0;

bBright=0;

dFact=0;

}

if(myCom=="zero"){

rBright=255;

gBright=255;

bBright=255;

}

if(myCom=="one"){

rBright=255;

gBright=0;

bBright=0;

}

if(myCom=="two"){

rBright=0;

gBright=255;

bBright=0;

}

if(myCom=="three"){

rBright=0;

gBright=0;

bBright=255;

}

if(myCom=="four"){

rBright=0;

gBright=255;

bBright=255;

}

if(myCom=="five"){

rBright=255;

gBright=0;

bBright=150;

}

if(myCom=="six"){

rBright=255;

gBright=255;

bBright=0;

}

if (myCom=="dn"){

dFact=dFact*.75;

}

if (myCom=="up"){

dFact=dFact*1.3;

if (dFact>1){

dFact=1;

}

analogWrite(rPin,rBright*dFact);

analogWrite(gPin,gBright*dFact);

analogWrite(bPin,bBright*dFact);

}

Jetson Xavier NX

Jetson Xavier NX Lesson 6: Camera Gear and Setup for Future Lessons

June 24, 2020 admin

In this lesson we discuss the future direction of this series, and the gear needed to move forward.

Moving forward, I will be running two pan/tilt servos for the raspberry pi cameras. I suggest buying the same gear HERE. I suggest purchasing two units.

Then, we also need two Version two raspberry pi cameras. I like the following ones, because they include a neat little acrylic case, and the long cable, which makes it work much better on the pan/tilt bracket. You can get the cameras HERE.

Arduino, Tutorial

ARDUINO TUTORIAL 67: Create a Remote Controlled RGB LED with Brightness and Color Control

June 23, 2020 admin

In this video we give you a homework assignment to create a dimmable RGB LED. You must set color and brightness using the IR remote. In Tutorial 68 we will take you through the build, and show you the solution. I hope you will really try your best to do it on your own before you check out my solution.

Technology Tutorials

ROBOTICS Training LESSON 4: Fundamentals of Robot Motor Control Using L298N Module

Jetson Xavier NX Lesson 7: Connecting and Controlling Servos

ARDUINO TUTORIAL 68: Make a Remote Controlled RGB LED with Brightness and Color Control

Jetson Xavier NX Lesson 6: Camera Gear and Setup for Future Lessons

ARDUINO TUTORIAL 67: Create a Remote Controlled RGB LED with Brightness and Color Control

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