这个教程的目的是,使用ESP8266+BMP280大气压强传感器,测量气压和温度,并推送到ThingsPanel物联网平台。
BMP280 是由 Bosch Sensortec 制造的一款数字大气压力传感器,它还可以测量温度。以下是它的一些主要特点和详情:
由于其能够测量环境温度和大气压力,BMP280 可用于多种应用,包括:
要将 BMP280 传感器连接到 ESP8266,你需要使用 I2C 通信协议。下面是如何连接它们并使用 Arduino IDE 编写代码来读取数据的步骤。
BMP280 模块与 ESP8266 NodeMCU 模块的接线通常如下:
创建设备时,选择BMP280插件,同时获得配置参数,并在如下代码中替换。
主要修改的包括
首先,确保你已经通过 Arduino IDE 安装了 BMP280 的库。你可以使用 "Sketch" 菜单中的 "Include Library" -> "Manage Libraries" 选项来找到并安装它。
#include <Wire.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BMP280.h>
#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#define SDA_PIN 4
#define SCL_PIN 5
const char* ssid = "Redmi";
const char* password = "123456789";
const char* mqtt_server = "dev.thingspanel.cn";
const int mqtt_port = 1883;
const char* mqtt_user = "bcda7c1d-de21-414a-841f-bb8d5285e0b9";
const char* mqtt_password = "";
const char* mqtt_topic = "device/attributes";
Adafruit_BMP280 bmp;
WiFiClient espClient;
PubSubClient client(espClient);
void setup() {
Serial.begin(115200);
Wire.begin(SDA_PIN, SCL_PIN);
if (!bmp.begin(0x76)) {
Serial.println("Could not find a valid BMP280 sensor, check wiring!");
while (1);
}
Serial.println("BMP280 sensor found and initialized");
setup_wifi();
client.setServer(mqtt_server, mqtt_port);
}
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.print("WiFi connected - IP address: ");
Serial.println(WiFi.localIP());
}
void reconnect() {
while (!client.connected()) {
Serial.print("Attempting MQTT connection...");
if (client.connect("bcda7c1d-de21-414a-841f-bb8d5285e0b9", mqtt_user, mqtt_password)) {
Serial.println("connected");
} 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();
float temperature = bmp.readTemperature();
float pressure = bmp.readPressure() / 100.0F;
Serial.print("Temperature = ");
Serial.print(temperature);
Serial.println(" *C");
Serial.print("Pressure = ");
Serial.print(pressure);
Serial.println(" hPa");
String payload = "{\"temperature\": " + String(temperature) + ", \"pressure\": " + String(pressure) + "}";
client.publish(mqtt_topic, payload.c_str());
delay(1000);
}
在Arduino IDE刷写代码即可。