/*
* DS18B20 Temperature sensor publish
* http://akademia.nettigo.pl/ds18b20/
*
* 18B20
WeMos
* OUT --+-- GPIO_14
*
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*
4.7K
*
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* VCC --+-- 3.3V
* GND ----- GND
*/
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <OneWire.h>
#include <DallasTemperature.h>
const char* ssid = "アクセスポイントのSSID";
const char* password = "アクセスポイントのパスワード";
const char* mqtt_server = "192.168.10.40";
//const char* mqtt_server = "broker.hivemq.com";
#define ONE_WIRE_BUS 14 //
データ(黄)で使用するポート番号
#define SENSER_BIT
9 // 精度の設定bit
#define INTERVAL
10 // データ取得間隔(秒)
#define
LED
5 // LED
WiFiClient espClient;
PubSubClient client(espClient);
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
long lastMillis = 0;
char msg[50];
void setup_wifi() {
// We start by connecting to a WiFi network
Serial.println();
Serial.println();
Serial.print("Wait for WiFi...");
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
}
void callback(char* topic, byte* payload, unsigned int
length) {
Serial.print("Message arrived [");
Serial.print(topic);
Serial.print("] ");
for (int i = 0; i < length; i++) {
Serial.print((char)payload[i]);
}
Serial.println();
}
void connect_mqtt() {
char clientid[20];
sprintf(clientid,"ESP8266-%6x",ESP.getChipId());
Serial.print("clientid=");
Serial.println(clientid);
// Loop until we're reconnected
while (!client.connected()) {
Serial.print("Attempting MQTT
connection...");
// Attempt to connect
// if (client.connect("ESP8266Client"))
{
if (client.connect(clientid)) {
Serial.println("connected");
// Once connected, publish
an announcement...
//
client.publish("outTopic", "hello world");
// ... and resubscribe
//
client.subscribe("inTopic");
} else {
Serial.print("failed,
rc=");
Serial.print(client.state());
Serial.println(" try again
in 5 seconds");
// Wait 5 seconds before
retrying
delay(5000);
}
}
}
void setup(void) {
delay(1000); Serial.begin(9600);
sensors.setResolution(SENSER_BIT);
setup_wifi();
client.setServer(mqtt_server, 1883);
client.setCallback(callback);
pinMode(LED,OUTPUT);
digitalWrite(LED,HIGH);
}
void loop(void) {
static int counter=0;
static int flag=0;
float value;
if (!client.connected()) connect_mqtt();
client.loop();
long now = millis();
if (now < lastMillis) lastMillis = now;
if (now - lastMillis > 1000) {
lastMillis = now;
counter++;
if (counter > INTERVAL) {
sensors.requestTemperatures();
value =
sensors.getTempCByIndex(0);
Serial.println(value);
int a = value;
int b = abs(value * 10);
b = b % 10;
sprintf (msg,
"%2d.%1d",a,b);
Serial.print("Publish
message: ");
Serial.println(msg);
client.publish("ds18b20/temp", msg);
flag=!flag;
digitalWrite(LED,flag);
counter=0;
}
}
}
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