Basicamente pessoal o thingspeak é um site gratuito onde através de um cadastro é gerado uma apkey e através dela nós inserimos no código do arduino e pimba. O ethernet shield manda os dados diretamente para o site e o site trata de formatá-los, deixando prontinho para leitura e interpretação.
Meu canal no thingspeak pode ser visualizado aqui
Uma vez feito o cadastro lah navegue ate a aba chaves e anote os dados de chave de escrita, que é ela que iremos trocar no codigo no campo"insira sua apkey aqui"
Um outro detalhe importante pessoal e que vocês tem que atualizar o campo "mac" conforme o mac de vocês.
Para saber o seu mac tem uma maneira simples:As ultimas IDES do arduino ja vem com a biblioteca ethernet shield instalada, então basta ir em examples>webclient e ver o mac que esta escrito lah, veja a imagem como exemplo:
Aqui pessoal irei mostrar 2 codigos: um funcionando com o uso de biblioteca, que é o caso do sensor dht11, e o outro funcionando com uma fórmula de conversão, que é o caso do sensor lm 35. Prestem atençao na string que ela é codificada após a conversão da leitura do sensor, através deste esqueleto vocês serão capazes de alterar o código as suas necessidades.
Primeiro pessoal montem conforme a imagem o lm 35:
-----------------------------
/*
Arduino --> ThingSpeak Channel via Ethernet
The ThingSpeak Client sketch is designed for the Arduino and Ethernet.
This sketch updates a channel feed with an analog input reading via the
ThingSpeak API (https://thingspeak.com/docs)
using HTTP POST. The Arduino uses DHCP and DNS for a simpler network setup.
The sketch also includes a Watchdog / Reset function to make sure the
Arduino stays connected and/or regains connectivity after a network outage.
Use the Serial Monitor on the Arduino IDE to see verbose network feedback
and ThingSpeak connectivity status.
Getting Started with ThingSpeak:
* Sign Up for New User Account - https://thingspeak.com/users/new
* Create a new Channel by selecting Channels and then Create New Channel
* Enter the Write API Key in this sketch under "ThingSpeak Settings"
Arduino Requirements:
* Arduino with Ethernet Shield or Arduino Ethernet
* Arduino 1.0+ IDE
Network Requirements:
* Ethernet port on Router
* DHCP enabled on Router
* Unique MAC Address for Arduino
Created: October 17, 2011 by Hans Scharler (http://www.nothans.com)
Additional Credits:
Example sketches from Arduino team, Ethernet by Adrian McEwen
*/
#include <SPI.h>
#include <Ethernet.h>
int pin= A1;
int tempc;
// Local Network Settings
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; // Insira o seu mac aqui.
// ThingSpeak Settings
char thingSpeakAddress[] = "api.thingspeak.com";
String writeAPIKey = "insira sua apkey aqui";
const int updateThingSpeakInterval = 16 * 1000; // Time interval in milliseconds to update ThingSpeak (number of seconds * 1000 = interval)
// Variable Setup
long lastConnectionTime = 0;
boolean lastConnected = false;
int failedCounter = 0;
// Initialize Arduino Ethernet Client
EthernetClient client;
void setup()
{
// Start Serial for debugging on the Serial Monitor
Serial.begin(9600);
pinMode(pin,INPUT);
// Start Ethernet on Arduino
startEthernet();
}
void loop()
{
tempc = ( 5.0 * analogRead(pin) * 100.0) / 1024.0;
// Read value from Analog Input Pin 0
String analogValue0 = String(tempc);
// Print Update Response to Serial Monitor
if (client.available())
{
char c = client.read();
Serial.print(c);
}
// Disconnect from ThingSpeak
if (!client.connected() && lastConnected)
{
Serial.println("...disconnected");
Serial.println();
client.stop();
}
// Update ThingSpeak
if(!client.connected() && (millis() - lastConnectionTime > updateThingSpeakInterval))
{
updateThingSpeak("field1="+analogValue0);
}
// Check if Arduino Ethernet needs to be restarted
if (failedCounter > 3 ) {startEthernet();}
lastConnected = client.connected();
}
void updateThingSpeak(String tsData)
{
if (client.connect(thingSpeakAddress, 80))
{
client.print("POST /update HTTP/1.1\n");
client.print("Host: api.thingspeak.com\n");
client.print("Connection: close\n");
client.print("X-THINGSPEAKAPIKEY: "+writeAPIKey+"\n");
client.print("Content-Type: application/x-www-form-urlencoded\n");
client.print("Content-Length: ");
client.print(tsData.length());
client.print("\n\n");
client.print(tsData);
lastConnectionTime = millis();
if (client.connected())
{
Serial.println("Connecting to ThingSpeak...");
Serial.println();
failedCounter = 0;
}
else
{
failedCounter++;
Serial.println("Connection to ThingSpeak failed ("+String(failedCounter, DEC)+")");
Serial.println();
}
}
else
{
failedCounter++;
Serial.println("Connection to ThingSpeak Failed ("+String(failedCounter, DEC)+")");
Serial.println();
lastConnectionTime = millis();
}
}
void startEthernet()
{
client.stop();
Serial.println("Connecting Arduino to network...");
Serial.println();
Serial.println();
delay(1000);
// Connect to network amd obtain an IP address using DHCP
if (Ethernet.begin(mac) == 0)
{
Serial.println("DHCP Failed, reset Arduino to try again");
Serial.println();
}
else
{
Serial.println("Arduino connected to network using DHCP");
Serial.println();
}
delay(1000);
}
-----------------------------------
Depois de compilar navegue ate o site e veja a maravilha funcionando:)
Agora vem o código com o dht11, primeiro monte conforme a imagem:
--------------------------------
/*
Arduino --> ThingSpeak Channel via Ethernet
The ThingSpeak Client sketch is designed for the Arduino and Ethernet.
This sketch updates a channel feed with an analog input reading via the
ThingSpeak API (https://thingspeak.com/docs)
using HTTP POST. The Arduino uses DHCP and DNS for a simpler network setup.
The sketch also includes a Watchdog / Reset function to make sure the
Arduino stays connected and/or regains connectivity after a network outage.
Use the Serial Monitor on the Arduino IDE to see verbose network feedback
and ThingSpeak connectivity status.
Getting Started with ThingSpeak:
* Sign Up for New User Account - https://thingspeak.com/users/new
* Create a new Channel by selecting Channels and then Create New Channel
* Enter the Write API Key in this sketch under "ThingSpeak Settings"
Arduino Requirements:
* Arduino with Ethernet Shield or Arduino Ethernet
* Arduino 1.0+ IDE
Network Requirements:
* Ethernet port on Router
* DHCP enabled on Router
* Unique MAC Address for Arduino
Created: October 17, 2011 by Hans Scharler (http://www.nothans.com)
Additional Credits:
Example sketches from Arduino team, Ethernet by Adrian McEwen
*/
#include "DHT.h"
#include <SPI.h>
#include <Ethernet.h>
#define DHTPIN A1 // pino que estamos conectado
#define DHTTYPE DHT11 // DHT 11
DHT dht(DHTPIN, DHTTYPE);
// Local Network Settings
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED }; // Coloque o seu mac
// ThingSpeak Settings
char thingSpeakAddress[] = "api.thingspeak.com";
String writeAPIKey = "insira sua apkey aqui";
const int updateThingSpeakInterval = 16 * 1000; // Time interval in milliseconds to update ThingSpeak (number of seconds * 1000 = interval)
// Variable Setup
long lastConnectionTime = 0;
boolean lastConnected = false;
int failedCounter = 0;
// Initialize Arduino Ethernet Client
EthernetClient client;
void setup()
{
// Start Serial for debugging on the Serial Monitor
Serial.begin(9600);
// Start Ethernet on Arduino
startEthernet();
}
void loop()
{
float h = dht.readHumidity();
float t = dht.readTemperature();
String temp = String(h);
String temp1 = String(t);
// Read value from Analog Input Pin 0
// Print Update Response to Serial Monitor
if (client.available())
{
char c = client.read();
Serial.print(c);
}
// Disconnect from ThingSpeak
if (!client.connected() && lastConnected)
{
Serial.println("...disconnected");
Serial.println();
client.stop();
}
// Update ThingSpeak
if(!client.connected() && (millis() - lastConnectionTime > updateThingSpeakInterval))
{
updateThingSpeak("field1="+temp+"&field2="+temp1);
}
// Check if Arduino Ethernet needs to be restarted
if (failedCounter > 3 ) {startEthernet();}
lastConnected = client.connected();
}
void updateThingSpeak(String tsData)
{
if (client.connect(thingSpeakAddress, 80))
{
client.print("POST /update HTTP/1.1\n");
client.print("Host: api.thingspeak.com\n");
client.print("Connection: close\n");
client.print("X-THINGSPEAKAPIKEY: "+writeAPIKey+"\n");
client.print("Content-Type: application/x-www-form-urlencoded\n");
client.print("Content-Length: ");
client.print(tsData.length());
client.print("\n\n");
client.print(tsData);
lastConnectionTime = millis();
if (client.connected())
{
Serial.println("Connecting to ThingSpeak...");
Serial.println();
failedCounter = 0;
}
else
{
failedCounter++;
Serial.println("Connection to ThingSpeak failed ("+String(failedCounter, DEC)+")");
Serial.println();
}
}
else
{
failedCounter++;
Serial.println("Connection to ThingSpeak Failed ("+String(failedCounter, DEC)+")");
Serial.println();
lastConnectionTime = millis();
}
}
void startEthernet()
{
client.stop();
Serial.println("Connecting Arduino to network...");
Serial.println();
Serial.println();
delay(1000);
// Connect to network amd obtain an IP address using DHCP
if (Ethernet.begin(mac) == 0)
{
Serial.println("DHCP Failed, reset Arduino to try again");
Serial.println();
}
else
{
Serial.println("Arduino connected to network using DHCP");
Serial.println();
}
delay(1000);
}
-----------------------------------------------------------------------------------
Se tudo correr bem seus gráficos ficarão assim:
E é isso ahe pessoal, até a próxima e em breve postarei o vídeo
e como prometido eis o video:
e como prometido eis o video:
Um comentário:
existe a possibilidade de se criar um sensor em arduino e ele demonstrar o resultado de java swing ??
obrigado!!
Postar um comentário