add oled

wifi-mqtt/wifi-mqtt/wifi-mqtt.ino

@@ -4,8 +4,15 @@
 #include <ESP8266HTTPClient.h>
 #include <PubSubClient.h>
 
+#include "SSD1306Wire.h"
 
-#define DHTPIN D4 //说明数据接口为8266开发板的D4口，也可以写为#define DHTPIN 2既8266芯片的IO口2
+const int I2C_ADDR = 0x3c;  // oled屏幕的I2c地址
+#define SDA_PIN D4           // SDA引脚，默认gpio4(D2)
+#define SCL_PIN D5           // SCL引脚，默认gpio5(D1)
+SSD1306Wire oled(I2C_ADDR, SDA_PIN, SCL_PIN);
+
+//#define DHTPIN D4 //说明数据接口为8266开发板的D4口，也可以写为#define DHTPIN 2既8266芯片的IO口2
+#define DHTPIN D1 //说明数据接口为8266开发板的D4口，也可以写为#define DHTPIN 2既8266芯片的IO口2
 #define DHTTYPE DHT11//说明使用的模块是DHT11
 DHT dht(DHTPIN,DHTTYPE);//DHT11初始化
 //定义浮点类型变量保存测量值
@@ -20,7 +27,7 @@ const char* host = "192.168.3.26:8873";
 
 // MQTT代理
 const char *mqtt_broker = "47.242.184.139";
-const char *topic = "/device/esp8266/001";
+const char *topic = "/device/esp8266/004";
 const char *mqtt_username = "admin";
 const char *mqtt_password = "publish452131wW452131wW$";
 const int mqtt_port = 1883;
@@ -33,7 +40,9 @@ PubSubClient client(espClient);
 ESP8266WebServer server(80);
             
 void setup() {    
-  pinMode(D4, INPUT);
+  pinMode(D2, OUTPUT);
+  digitalWrite(D2,HIGH);//IO口2设置为高电平，点亮数字2口LED
+  //digitalWrite(D2,LOW);//IO口2设置为高电平，点亮数字2口LED
   Serial.begin(115200);
   delay(100);
   dht.begin();              
@@ -59,7 +68,7 @@ void setup() {
   //mqtt init
   //连接到mqtt代理
   client.setServer(mqtt_broker, mqtt_port);
-  //client.setCallback(callback);
+  client.setCallback(callback);
   while (!client.connected()) {
       String client_id = "esp8266-client-";
       client_id += String(WiFi.macAddress());
@@ -75,6 +84,14 @@ void setup() {
   // 发布和订阅
   //client.publish(topic, "hello emqx");
   client.subscribe(topic);
+
+  /* 2. oled屏幕初始化 */
+  oled.init();
+  oled.flipScreenVertically();  // 设置屏幕翻转
+  oled.setContrast(255);        // 设置屏幕亮度
+  drawRect();                   // 测试屏幕显示
+  oled.clear();
+  oled.display();  // 清除屏幕
 }
 void loop() {
   //http
@@ -126,8 +143,21 @@ void loop() {
   if (WiFi.status() == WL_CONNECTED) {
     if(client.connected()){
       String sendStr = String(Temperature)+" "+String(Humidity);
+      String wendu = String("Tem:")+String(Temperature);
+      String shidu = String("Hum:")+String(Humidity);
+
       Serial.println(sendStr);
       client.publish(topic,sendStr.c_str());
+
+      oled.setFont(ArialMT_Plain_16);        // 设置字体
+      oled.drawString(0, 0, wendu);  // 将要显示的文字写入缓存
+      oled.drawString(0, 20,shidu);  // 将要显示的文字写入缓存
+      oled.drawString(0, 40,sendStr);  // 将要显示的文字写入缓存
+      oled.display();                        // 将缓存里的文字在屏幕上显示
+      digitalWrite(LED_BUILTIN, LOW);        // Turn the LED on
+      delay(300);
+      digitalWrite(LED_BUILTIN, HIGH);  // Turn the LED off
+      delay(500);
     }else{
       Serial.println(client.state());
       String client_id = "esp8266-client-";
@@ -135,6 +165,7 @@ void loop() {
       Serial.printf("The client %s connects to the public mqtt broker\n", client_id.c_str());
       if(client.connect(client_id.c_str(), mqtt_username, mqtt_password)) {
         Serial.println("Public emqx mqtt broker connected");
+        client.subscribe(topic);
       }else{
           Serial.print("failed with state ");
           Serial.print(client.state());
@@ -209,3 +240,10 @@ void callback(char *topic, byte *payload, unsigned int length) {
   Serial.println("-----------callback------------");
 }
 
+void drawRect(void) {
+  for (int16_t i = 0; i < oled.getHeight() / 2; i += 2) {
+    oled.drawRect(i, i, oled.getWidth() - 2 * i, oled.getHeight() - 2 * i);
+    oled.display();
+    delay(50);
+  }
+}