ESP8266开发板制作一个自动浇花系统
#include <ESP8266WiFi.h>
#include <DHT.h>
#include <PubSubClient.h>
#define DHTPIN D4 // DHT11 pin
#define DHTTYPE DHT11 // DHT 11
DHT dht(DHTPIN, DHTTYPE);
#define SOIL_MOISTURE_PIN A0
#define RELAY_PIN D5
const char* ssid = "your_SSID";
const char* password = "your_PASSWORD";
const char* mqtt_server = "your_mqtt_server";
const int mqtt_port = 1883;
const char* mqtt_user = "your_mqtt_user";
const char* mqtt_password = "your_mqtt_password";
const char* topic_soil_moisture = "garden/soil_moisture";
const char* topic_temperature = "garden/temperature";
const char* topic_humidity = "garden/humidity";
WiFiClient espClient;
PubSubClient client(espClient);
void setup() {
Serial.begin(115200);
pinMode(RELAY_PIN, OUTPUT);
digitalWrite(RELAY_PIN, LOW);
dht.begin();
setup_wifi();
client.setServer(mqtt_server, mqtt_port);
client.setCallback(callback);
}
void setup_wifi() {
delay(10);
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, 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) {
}
void reconnect() {
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
if (client.connect("ESP8266Client", mqtt_user, mqtt_password)) {
Serial.println("connected");
client.subscribe("garden/control");
} 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();
int soilMoistureValue = analogRead(SOIL_MOISTURE_PIN);
float h = dht.readHumidity();
float t = dht.readTemperature();
Serial.print("Soil Moisture: ");
Serial.println(soilMoistureValue);
Serial.print("Temperature: ");
Serial.println(t);
Serial.print("Humidity: ");
Serial.println(h);
if (soilMoistureValue < 300) {
digitalWrite(RELAY_PIN, HIGH);
} else {
digitalWrite(RELAY_PIN, LOW);
}
client.publish(topic_soil_moisture, String(soilMoistureValue).c_str());
client.publish(topic_temperature, String(t).c_str());
client.publish(topic_humidity, String(h).c_str());
delay(2000);
}
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