in visual studio code i have 3 files
1: demo.sitemap
sitemap demo label=“demo” {
Frame label="Nhiet do" {
Text item=Temperature
}
Frame label="Do am" {
Text item=Humidity
}
}
2: tem&humidity.items
Number Temperature “Temperature [%.1f °C]” {channel = “mqtt:topic:hivemqbroker:nodemcu:temperature”}
Number Humidity "Humidity " {channel = “mqtt:topic:hivemqbroker:nodemcu:humidity”}
3: test_mqtt.things
Bridge mqtt:broker:hivemqbroker [ host=“broker.hivemq.com”, secure=false, username=“openhab”, password=“openhab” ]
{
Thing topic nodemcu
{
Channels:
Type number : temperature [ stateTopic="temperature/state" ]
Type number : humidity [ stateTopic="humidity/state" ]
}
}
and my arduino code:
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include “DHT.h”
// nut nhan 1
int stateButton1;
int previous1 = LOW;
long settime1 = 0;
// nut nhan 2
long settime_nhietdo = 0;
long debounce = 200;
// Cau hinh cam bien DHT
#define DHTTYPE DHT11
DHT dht(D6, DHT11);
// Dinh nghia wifi ket noi den NodeMCU
#define wifi_ssid “Wifi free” // tên wifi mà ESP8266 sẽ kết nối
#define wifi_password “24102001” // mật khẩu wifi
const char* mqtt_server = “broker.hivemq.com”; // Địa chỉ IP của máy chủ MQTT server
const char* mqttUser = “openhab”; // User mqtt nguoi dung
const char* mqttPassword = “openhab”; // Password mqtt
// Tao Client server cho NodeMCU ket noi
WiFiClient espClient;
PubSubClient client(espClient);
float t;
float h;
void setup() {
Serial.begin(115200);
dht.begin();
setup_wifi();
client.setServer(mqtt_server, 1883);
Serial.println(“SV_connected”);
client.setCallback(callback);
Serial.println(“successed”);
}
void setup_wifi(){
delay(10);
Serial.println();
Serial.print(“Connecting to “);
Serial.println(wifi_ssid);
WiFi.begin(wifi_ssid, wifi_password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(”.”);
}
Serial.println("");
Serial.println(“WiFi connected”);
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}
void callback(char* topic, byte* payload, unsigned int length) {
Serial.println(“Control by web”);
Serial.print("Trang thai led: ");
}
void reconnect() {
while (!client.connected()) {
Serial.print(“Connecting to MQTT…”);
if (client.connect(“ESP8266”, mqttUser, mqttPassword )) {
Serial.println(“Connected”);
client.subscribe(“light/command”);
} else {
Serial.print(“failed, rc=”);
Serial.print(client.state());
Serial.println(" try again in 5 seconds");
delay(5000);
}
}
}
void loop() {
if (!client.connected()) {
reconnect();
}
client.loop();
// Gui du lieu dht11 len openhab
if(millis() - settime_nhietdo > 5000) {
Serial.println(“Nhiet do va do am”);
float h = dht.readHumidity();
float t = dht.readTemperature();
Serial.print(“Nhiet do = “);
Serial.print(t);
Serial.println(“C”);
Serial.print(” Do am = “);
Serial.print(h);
Serial.println(”%”);
Serial.println("");
char buffer[10];
dtostrf(t,0, 0, buffer);
client.publish(“temperature/state”,buffer);
dtostrf(h,0, 0, buffer);
client.publish(“humidity/state”,buffer);
settime_nhietdo = millis();
}
}
