HannahPernerWilson: Die Seite wurde neu angelegt: „==Arduino Code== /////////////////////////////////////////////////////////////////////////////////// // Code…“

2022-05-17T17:56:42Z

Die Seite wurde neu angelegt: „==Arduino Code== <source lang="js" line start="2" highlight="4-6"> /////////////////////////////////////////////////////////////////////////////////// // Code…“

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==Arduino Code==

<source lang="js" line start="2" highlight="4-6">
///////////////////////////////////////////////////////////////////////////////////
// Code for ESP32 DEV MODULE 38pin version
///////////////////////////////////////////////////////////////////////////////////
// Example for sending & receiving messages via an MQTT broker with an ESP32
// Send integers '0' or '1' to the address "/led" to turn on/off an LED on pin14.
// Every time the analog sensor value on pin36 goes bellow the "threshold" value
// a message is sent to the address "/sensor" with the current sensor value.
///////////////////////////////////////////////////////////////////////////////////
// based on Shiftr.io example code by Joël Gähwiler:
// https://shiftr.io/try
// https://www.shiftr.io/docs/manuals/arduino
// https://github.com/256dpi/arduino-mqtt
// this code is intended for use with the Shifr Desktop App!
///////////////////////////////////////////////////////////////////////////////////
// when uploading code: sometimes necessairy
// to presss&hold the "BOOT" button
// when you see the following lines:
// "Connecting........_____....._____....."
/////////////////////////////////////////////////

#include <WiFi.h>
#include <MQTT.h>

const char ssid[] = "ladenlokal";
const char pass[] = "puppe2010";

WiFiClient net;
MQTTClient client;

#define LED_PIN 35 //27
#define SENSOR_PIN 36
unsigned int ledState = LOW;
int sensorValue = 0;
int thresholdValue = 4000;

unsigned long lastMillis = 0;

void connect() {
Serial.print("checking wifi...");
while (WiFi.status() != WL_CONNECTED) {
Serial.print(".");
delay(1000);
}

Serial.print("\nconnecting...");
while (!client.connect("arduino", "", "")) {
Serial.print(".");
delay(1000);
}

Serial.println("\nconnected!");

client.subscribe("/led");
// client.unsubscribe("/hello");
}

void messageReceived(String &topic, String &payload) {
Serial.println("incoming: " + topic + " - " + payload);
}

void setup() {
pinMode(LED_PIN, OUTPUT);
pinMode(SENSOR_PIN, INPUT);
digitalWrite(LED_PIN, ledState);

Serial.begin(115200);
WiFi.begin(ssid, pass);

// Note: Local domain names (e.g. "Computer.local" on OSX) are not supported by Arduino.
// You need to set the IP address directly.
client.begin("192.168.236.90", 2883, net);
client.onMessage(messageReceived);

connect();
}

void loop() {
client.loop();
//delay(10); // <- fixes some issues with WiFi stability

if (!client.connected()) {
connect();
}

// publish a message only when the sensor value goes bellow threshold:
sensorValue = analogRead(SENSOR_PIN);
if (sensorValue < thresholdValue) {
//because we send Strings over MQTT we first need to convert:
String sensorValueString = String(sensorValue);
client.publish("/sensor", sensorValueString);
Serial.println(sensorValue);
}

// publish a message roughly every second:
if (millis() - lastMillis > 1000) {
lastMillis = millis();
//client.publish("/hello", "world");
}
}

// function for turning on/off the LED
// depending on if one recives 1/0:
void led(int LED_on_off) {
ledState = LED_on_off;
digitalWrite(LED_PIN, ledState);
Serial.print("/led: ");
Serial.println(ledState);
}
</source>

==Processing Code==

<source lang="js" line start="2" highlight="4-6">
///////////////////////////////////////////////////////////////////////////////////
// Code for ESP32 DEV MODULE 38pin version
///////////////////////////////////////////////////////////////////////////////////
// Example for sending & receiving messages via an MQTT broker with an ESP32
// Send integers '0' or '1' to the address "/led" to turn on/off an LED on pin14.
// Every time the analog sensor value on pin36 goes bellow the "threshold" value
// a message is sent to the address "/sensor" with the current sensor value.
///////////////////////////////////////////////////////////////////////////////////
// based on Shiftr.io example code by Joël Gähwiler:
// https://shiftr.io/try
// https://www.shiftr.io/docs/manuals/processing
// this code is intended for use with the Shifr Desktop App!
///////////////////////////////////////////////////////////////////////////////////
// when uploading code: sometimes necessairy
// to presss&hold the "BOOT" button
// when you see the following lines:
// "Connecting........_____....._____....."
/////////////////////////////////////////////////

import mqtt.*;

MQTTClient client;

String onOff = "0";
float backgroundShade = 0;

void setup() {
size(400, 400);
frameRate(25);

client = new MQTTClient(this);
client.connect("mqtt://192.168.236.90:2883", "processing");
}

void draw() {
background(backgroundShade);
}

void mousePressed() {
if (onOff == "0") {
onOff = "1";
} else onOff = "0";

client.publish("/led", onOff);
}

void clientConnected() {
println("client connected");
client.subscribe("/sensor");
client.subscribe("/hello");
}

float messageValue;

// incoming MQTT messages are forwarded to this messageReceived function:
void messageReceived(String topic, byte[] payload) {
println("incoming MQTT message: " + topic + " - " + new String(payload));
String str = new String(payload);
int payloadInt = int(str);

//if (topic == "/sensor") {
println("sensor value: " + payloadInt);
backgroundShade = map(payloadInt, 0, 4000, 0, 255);
//}

}

void connectionLost() {
println("connection lost");
}

</source>

MQTT between Arduino and Processing - Versionsgeschichte

HannahPernerWilson: Die Seite wurde neu angelegt: „==Arduino Code== /////////////////////////////////////////////////////////////////////////////////// // Code…“