Onnowpurbo at 11:56, 19 October 2017

2017-10-19T11:56:58Z

← Older revision		Revision as of 11:56, 19 October 2017
Line 12:		Line 12:

	#define MQTT_SERVER "192.168.0.100"		#define MQTT_SERVER "192.168.0.100"

	// MAC Address of Arduino Ethernet Sheild (on sticker on shield)		// MAC Address of Arduino Ethernet Sheild (on sticker on shield)
	byte MAC_ADDRESS[] = { 0x90, 0xA2, 0xDA, 0x0D, 0x31, 0xB8 };		byte MAC_ADDRESS[] = { 0x90, 0xA2, 0xDA, 0x0D, 0x31, 0xB8 };
Line 20:		Line 20:
	EthernetClient ethClient;		EthernetClient ethClient;
	PubSubClient client(server, 1883, callback, ethClient);		PubSubClient client(server, 1883, callback, ethClient);

	// Pin 8 is the LED output pin		// Pin 8 is the LED output pin
	int ledPin = 8;		int ledPin = 8;
Line 87:		Line 87:
	client.loop();		client.loop();
	}		}

	// handles message arrived on subscribed topic(s)		// handles message arrived on subscribed topic(s)
	void callback(char* topic, byte* payload, unsigned int length) {		void callback(char* topic, byte* payload, unsigned int length) {

Onnowpurbo at 01:12, 11 May 2017

2017-05-11T01:12:13Z

← Older revision		Revision as of 01:12, 11 May 2017
Line 1:		Line 1:
			Code:

	#include <SPI.h>		#include <SPI.h>
	#include <PubSubClient.h>		#include <PubSubClient.h>

Onnowpurbo: Created page with " #include #include #include /* * LightSensorMqttDemo * * A simple m2m.io platform demo for Arduino. */ #define MQTT_SERVE..."

2017-05-11T01:12:02Z

Created page with " #include <SPI.h> #include <PubSubClient.h> #include <Ethernet.h> * LightSensorMqttDemo * * A simple m2m.io platform demo for Arduino.: #define MQTT_SERVE..."

New page

#include <SPI.h>
#include <PubSubClient.h>
#include <Ethernet.h>

/*
* LightSensorMqttDemo
*
* A simple m2m.io platform demo for Arduino.
*/

#define MQTT_SERVER "192.168.0.100"

// MAC Address of Arduino Ethernet Sheild (on sticker on shield)
byte MAC_ADDRESS[] = { 0x90, 0xA2, 0xDA, 0x0D, 0x31, 0xB8 };
IPAddress ip(192, 168, 0, 4);
IPAddress server(192, 168, 0, 100);

EthernetClient ethClient;
PubSubClient client(server, 1883, callback, ethClient);

// Pin 8 is the LED output pin
int ledPin = 8;
// Analog 2 is the input pin
int lightPinIn = 2;

// defines and variable for sensor/control mode
#define MODE_OFF 0 // not sensing light, LED off
#define MODE_ON 1 // not sensing light, LED on
#define MODE_SENSE 2 // sensing light, LED controlled by software
int senseMode = 0;

unsigned long time;

char message_buff[100];

void setup()
{
// initialize the digital pin as an output.
pinMode(ledPin, OUTPUT);

// init serial link for debugging
Serial.begin(9600);

if (Ethernet.begin(MAC_ADDRESS) == 0)
{
Serial.println("Failed to configure Ethernet using DHCP");
return;
}
}

void loop()
{
if (!client.connected())
{
// clientID, username, MD5 encoded password
// arduino-mqtt, mqtt-spt, e10adc3949ba59abbe56e057f20f883e (123456)
client.connect("arduino-mqtt");
client.publish("arduino/lightsensor", "I'm alive!");
client.subscribe("arduino/lightsensor");
}

// read from light sensor (photocell)
int lightRead = analogRead(lightPinIn);

// if there is light in the room, turn off LED
// else, if it is "dark", turn it on
// scale of light in this circit is roughly 0 - 900
// 900 is a "magic number" for "dark"
if (lightRead > 900) {
digitalWrite(ledPin, LOW);
} else {
digitalWrite(ledPin, HIGH);
}

// publish light reading every 5 seconds
if (millis() > (time + 5000)) {
time = millis();
String pubString = "{\"report\":{\"light\": \"" + String(lightRead) + "\"}}";
pubString.toCharArray(message_buff, pubString.length()+1);
//Serial.println(pubString);
client.publish("arduino/lightsensor", message_buff);
}

// MQTT client loop processing
client.loop();
}

// handles message arrived on subscribed topic(s)
void callback(char* topic, byte* payload, unsigned int length) {

int i = 0;

//Serial.println("Message arrived: topic: " + String(topic));
//Serial.println("Length: " + String(length,DEC));

// create character buffer with ending null terminator (string)
for(i=0; i<length; i++) {
message_buff[i] = payload[i];
}
message_buff[i] = '\0';

String msgString = String(message_buff);

//Serial.println("Payload: " + msgString);

if (msgString.equals("{\"command\":{\"lightmode\": \"OFF\"}}")) {
senseMode = MODE_OFF;
} else if (msgString.equals("{\"command\":{\"lightmode\": \"ON\"}}")) {
senseMode = MODE_ON;
} else if (msgString.equals("{\"command\":{\"lightmode\": \"SENSE\"}}")) {
senseMode = MODE_SENSE;
}
}

MQTT: Arduino Light Sensor - Revision history

Onnowpurbo at 11:56, 19 October 2017

Onnowpurbo at 01:12, 11 May 2017

Onnowpurbo: Created page with " #include #include #include /* * LightSensorMqttDemo * * A simple m2m.io platform demo for Arduino. */ #define MQTT_SERVE..."