GANESH GADGETS: 2020

P5.js codes in side bloggers

p5.js is a JavaScript library that starts with the original goal of Processing—to make coding accessible for artists, designers, educators, and beginners—and reinterprets this for today's web.

So you have made your p5.js code at your local server or with processing ide, and now you are trying to publish it over internet. Publishing over internet is quite a long process and might cost you a little. Here I have came with a solution to put your processing code over internet using bloggers. Its free and fast, easy to use.

Make your code using p5.js either using local server of using processing ide. After verifying that code, put that inside the given area below. Don,t modify the other codes, you might end-up in errors.

Open bloggers -> themes ->Edit Html ->Paste the code below

Code below:

<?xml version="1.0" encoding="UTF-8" ?>

<head>

<b:if cond='data:blog.isMobile'>

<b:else/>

</b:if>

<b:include data='blog' name='all-head-content'/>

<b:skin><![CDATA[

body {

font: $(body.font);

color: $(body.text.color);

background: $(body.background);

padding: 0 $(content.shadow.spread) $(content.shadow.spread) $(content.shadow.spread);

$(body.background.override) margin: 0;

padding: 0;

}

]]></b:skin>

const barWidth = 20;

let lastBar = -1;

function setup() {

createCanvas(720, 400);

colorMode(HSB, width, height, 100);

noStroke();

}

function draw() {

let whichBar = mouseX / barWidth;

if (whichBar !== lastBar) {

let barX = whichBar * barWidth;

fill(barX, mouseY, 66);

rect(barX, 0, barWidth, height);

lastBar = whichBar;

}

</script>

</head>

<body>

<b:section class='main' id='main' showaddelement='yes'/>

</body>

</html>

How the Ultrasonic Sensor works:

Ultrasonic sensors work by emitting sound waves at a frequency too high for humans to hear. They then wait for the sound to be reflected back, calculating distance based on the time of the journey. This is similar to how radar measures the time it takes a radio wave to return after hitting an object.While some sensors use a separate sound emitter and receiver, it’s also possible to combine these into one package device, having an ultrasonic element alternate between emitting and receiving signals. This type of sensor can be manufactured in a smaller package than with separate elements, which is convenient for applications where size is at a premium.

Requirements:

Hardwares

Arduino Uno
HCSR04 Module
Jumper wires
LED series with 200 ohm resister(here we will use in-built led on 13 pin)

Softwares

Arduino library
HCSR04 library: https://github.com/gamegine/HCSR04-ultrasonic-sensor-lib

Circuit Diagram

Code to be run:

//In this project, if a object appears in front of Ultrasonic Sensor with in the range 30-50 cm, the led will glow for 5 seconds.

#include <HCSR04.h>

HCSR04 hc(2,3);//initialisation class HCSR04 (trig pin , echo pin)

const int led= 13;

const int uplimit= 50, lowlimit= 30; //Any object between 30cm to 50cm to trigger led//

void setup()

{

Serial.begin(9600);

pinMode(13,OUTPUT);

}

void loop()

{

int distance = hc.dist();

Serial.println(distance);

if( (distance>=lowlimit) && (distance<= uplimit))//OBJECT IN RANGE=LED ON FOR 5 SECS

{

digitalWrite(led, HIGH);

delay(5000);

digitalWrite(led, LOW);

}

Code to Re-Connect Blynkserver Automatically

Issue: Sometimes the hardware(eg. Nodemcu) doesn't connect to router automatically, when there is a break in connection.

Solution:

In this we'll add a timer. When there is no connection, the timer will start and try to reconnect in every specified time interval. to make this happen we need a library called as simple timer.

#Simple timer library: https://github.com/schinken/SimpleTimer

Extract this library to the library folder in Arduino folder in my documents.

Write the following code:

#include <SimpleTimer.h>

#include <ESP8266WiFi.h>

#include <BlynkSimpleEsp8266.h>

SimpleTimer timer; //Creating simple timer variable

char auth[] = "MxLDc********************KtUI";

char ssid[] = "**********";

char pass[] = "**********";

void setup()

{

Serial.begin(9600);

Blynk.begin(auth, ssid, pass);

timer.setInterval(10000, reconnectBlynk); //Setting interval to 10 seconds to Run function"reconnectBlynk"

}

void reconnectBlynk() {

if (!Blynk.connected()) {

if(Blynk.connect()) {

BLYNK_LOG("Reconnected");

} else {

BLYNK_LOG("Not reconnected");

}

void loop()

{

if (Blynk.connected()) {

Blynk.run();

}

if (!Blynk.connected()) {

timer.run();

}

P5.js codes in side bloggers

Using HCSR04 - Ultrasonic Sensor

Code to Re-Connect Blynkserver Automatically

Issue: Sometimes the hardware(eg. Nodemcu) doesn't connect to router automatically, when there is a break in connection.