Tag Archives: LED

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

MicroPython MultiCore Programming on the Raspberry Pi Pico Using Threading

May 7, 2024 admin

In this video I show how to use both cores on the Raspberry Pi Pico W. We will explore an example using threading where we will operate 2 LED and a servo.

from machine import Pin
import time
import _thread
import SERVO

greenPin=14
redPin=15
servoPin=17

LED=""

redLED=Pin(redPin,Pin.OUT)
greenLED=Pin(greenPin,Pin.OUT)

delOn=.1
delOff=.1
myServo=SERVO.servo(servoPin)
running =True

def othCore(del1,del2):
    global LED
    while True:
        if LED=="RED":
            redLED.value(1)
            time.sleep(del1)
            redLED.value(0)
            time.sleep(del2)
        if LED=="GREEN":
            greenLED.value(1)
            time.sleep(del1)
            greenLED.value(0)
            time.sleep(del2)
_thread.start_new_thread(othCore,(delOn,delOff))
time.sleep(.25)
while True:
    LED="RED"
    for i in range(0,180,1):
        myServo.pos(i)
        time.sleep(.01)
    LED="GREEN"
    for i in range(180,0,-1):
        myServo.pos(i)
        time.sleep(.01)

from machine import Pin

import time

import _thread

import SERVO

greenPin=14

redPin=15

servoPin=17

LED=""

redLED=Pin(redPin,Pin.OUT)

greenLED=Pin(greenPin,Pin.OUT)

delOn=.1

delOff=.1

myServo=SERVO.servo(servoPin)

running =True

def othCore(del1,del2):

global LED

while True:

if LED=="RED":

redLED.value(1)

time.sleep(del1)

redLED.value(0)

time.sleep(del2)

if LED=="GREEN":

greenLED.value(1)

time.sleep(del1)

greenLED.value(0)

time.sleep(del2)

_thread.start_new_thread(othCore,(delOn,delOff))

time.sleep(.25)

while True:

LED="RED"

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

myServo.pos(i)

time.sleep(.01)

LED="GREEN"

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

myServo.pos(i)

time.sleep(.01)

Raspberry Pi

Create a Dimmable LED with a Potentiometer on the Raspberry Pi

June 23, 2022 admin

In this video lesson, we show how to create a dimmable LED on the raspberry pi using a potentiometer. Below is the schematic of the circuit we will be using.

Then we used the following code to read values through the ADC0834 analog to digital chip, and then apply a PWM signal to control the brightness of the LED.

import RPi.GPIO as GPIO
import ADC0834
import time

GPIO.setmode(GPIO.BCM)

LEDPin=23
GPIO.setup(LEDPin,GPIO.OUT)
myPWM=GPIO.PWM(LEDPin,1000)
myPWM.start(0)
ADC0834.setup()
try:
    while True:
        analogVal=ADC0834.getResult(0)
        print('Raw= ',analogVal, 'Vol= ', analogVal/255*5)
        DC=analogVal*100/255
        myPWM.ChangeDutyCycle(DC)
        time.sleep(.2)
        
except KeyboardInterrupt:
    GPIO.cleanup()
    print('GPIO Good to Go')

import RPi.GPIO as GPIO

import ADC0834

import time

GPIO.setmode(GPIO.BCM)

LEDPin=23

GPIO.setup(LEDPin,GPIO.OUT)

myPWM=GPIO.PWM(LEDPin,1000)

myPWM.start(0)

ADC0834.setup()

try:

while True:

analogVal=ADC0834.getResult(0)

print('Raw= ',analogVal, 'Vol= ', analogVal/255*5)

DC=analogVal*100/255

myPWM.ChangeDutyCycle(DC)

time.sleep(.2)

except KeyboardInterrupt:

GPIO.cleanup()

print('GPIO Good to Go')

Arduino with Python, Python

Using an Arduino with Python LESSON 11: Controlling an LED from Python

March 22, 2022 admin

In this video lesson, we show how to control an LED using python. Python sends commands to arduino, which then controls the LED. We also create a vPython visual, where the ‘Virtual’ LED mimics the behavior of the real LED. This a really cool demonstration and hope you enjoy it. I include below the code we develop in the video. On the arduino side we end up with the following:

int redPin=11;
int greenPin=10;
int bluePin=9;
int redVal=255;
int greenVal=255;
int blueVal=255;
String cmd;
void setup() {
  // put your setup code here, to run once:
Serial.begin(115200);
pinMode(redPin,OUTPUT);
pinMode(greenPin,OUTPUT);
pinMode(bluePin,OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  while(Serial.available()==0){
  }
redVal=Serial.readStringUntil(':').toInt();
greenVal=Serial.readStringUntil(':').toInt();
blueVal=Serial.readStringUntil('\r').toInt();

analogWrite(redPin,redVal);
analogWrite(greenPin,greenVal);
analogWrite(bluePin,blueVal);

}

int redPin=11;

int greenPin=10;

int bluePin=9;

int redVal=255;

int greenVal=255;

int blueVal=255;

String cmd;

void setup() {

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

Serial.begin(115200);

pinMode(redPin,OUTPUT);

pinMode(greenPin,OUTPUT);

pinMode(bluePin,OUTPUT);

}

void loop() {

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

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

}

redVal=Serial.readStringUntil(':').toInt();

greenVal=Serial.readStringUntil(':').toInt();

blueVal=Serial.readStringUntil('\r').toInt();

analogWrite(redPin,redVal);

analogWrite(greenPin,greenVal);

analogWrite(bluePin,blueVal);

}

And on the python side we have:

import serial
from vpython import *

arduinoData=serial.Serial('com3',115200)

myOrb=sphere(color=color.black,radius=1)

while True:
    myCmd=input('Please Input Your Color R:G:B 0-255 ')
    myCmd=myCmd+'\r'
    arduinoData.write(myCmd.encode())
    myColor=myCmd.split(':')
    red=int(myColor[0])
    green=int(myColor[1])
    blue=int(myColor[2])
    myOrb.color=vector(red/255,green/255,blue/255)

import serial

from vpython import *

arduinoData=serial.Serial('com3',115200)

myOrb=sphere(color=color.black,radius=1)

while True:

myCmd=input('Please Input Your Color R:G:B 0-255 ')

myCmd=myCmd+'\r'

arduinoData.write(myCmd.encode())

myColor=myCmd.split(':')

red=int(myColor[0])

green=int(myColor[1])

blue=int(myColor[2])

myOrb.color=vector(red/255,green/255,blue/255)

Jetson Nano

AI on the Jetson Nano LESSON 58: Controlling an LED With GPIO Pins and Button Switch

September 5, 2020 admin

In this lesson we show you how to control a simple LED circuit using the GPIO pins on the Jetson Nano. We use pull up resistors to connect a push button to the Jetson Nano GPIO pins. We create a toggle switch where the light turns off when the button is pressed, and then turns it back on when pressed again.

Technology Tutorials

Tag Archives: LED

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

MicroPython MultiCore Programming on the Raspberry Pi Pico Using Threading

Create a Dimmable LED with a Potentiometer on the Raspberry Pi

Using an Arduino with Python LESSON 11: Controlling an LED from Python

AI on the Jetson Nano LESSON 58: Controlling an LED With GPIO Pins and Button Switch

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