觀察筆記

QBoat Sunny provides similar functions to a standard QNAP NAS, and provides outstanding performance for Edge Computing. In this tutorial, we will use Wi-Fi as an application scenario:

 

Diagram



MediaTek LinkIt 7697 development board

 

Use HTTP to request the temperature and humidity readings from the DHT11.

 

Pin connections

 

 

The code is as follows.

 

Please note that you can test the code by connecting a wireless AP router by LWiFi. If successful, then the DHT11 will send the temperature value via HTTP (for example: http://192.168.1.xxx/temp).

 

 

<< MonitorNode.ino >>

 

#include <LWiFi.h>

#include "DHT.h"

#define DHTPIN 3 // what digital pin we’re connected to

#define WARNPIN 13

// Uncomment the type you are using

#define DHTTYPE DHT11 // DHT 11

//#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321

//#define DHTTYPE DHT21 // DHT 21 (AM2301)

DHT dht(DHTPIN, DHTTYPE);

char ssid[] = “LaisanHere”; // your network SSID (name)

char pass[] = “t101419008”; // your network password

int keyIndex = 0; // your network key Index number (needed only for WEP)

int status = WL_IDLE_STATUS;

WiFiServer server(80);

void setup() {

//Initialize serial and wait for the port to open:

Serial.begin(9600);

while (!Serial) {

; // wait for the serial port to connect. Needed for native USB port only

}

// attempt to connect to the Wi-Fi network:

while (status != WL_CONNECTED) {

Serial.print(“Attempting to connect to SSID: “);

Serial.println(ssid);

// Connect to a WPA/WPA2 network. Change this line if using an open or WEP network:

status = WiFi.begin(ssid, pass);

}

server.begin();

// you are now connected, so display the status:

printWifiStatus();

// Activate DHT11

dht.begin();

pinMode(WARNPIN, OUTPUT);

digitalWrite(WARNPIN, LOW);

}

void loop() {

// listen for incoming clients

WiFiClient client = server.available();

if (client) {

Serial.println(“new client”);

String msg;

String param;

// an HTTP request ends with a blank line

if (client.connected()) {

while (client.available()) {

char c = client.read();

msg += String(c);

}

}

Serial.print(msg);

int posi = msg.indexOf(“Referer: “);

if(posi > 0)

{

String sb = msg.substring(posi);

int p = sb.indexOf(“/”);

param = sb.substring(p+2);

p = param.indexOf(“/”);

param = param.substring(p, p+5);

}

else

{

posi = msg.indexOf(“GET”);

param = msg.substring(posi+4, posi+9);

}

Serial.println(param);

// send a standard HTTP response header

client.println(“HTTP/1.1 200 OK”);

client.println(“Content-Type: text/html”);

client.println(“Connection: close”); // the connection will be closed after completion of the response

client.println();

if(param == “/warn”)

{

digitalWrite(WARNPIN, HIGH);

client.println(“WARNING !!”);

}

if(param == “/cler”)

{

digitalWrite(WARNPIN, LOW);

client.println(“CLEAR”);

}

if(param == “/temp”)

{

float t = dht.readTemperature();

client.println(t);

}

if(param == “/humi”)

{

float h = dht.readHumidity();

client.println(h);

}

// close the connection:

client.stop();

Serial.println(“client disonnected”);

}

// give the web browser time to receive the data

delay(100);

}

void printWifiStatus() {

// display the SSID of the network you are connected to:

Serial.print(“SSID: “);

Serial.println(WiFi.SSID());

// display your Wi-Fi IP address:

IPAddress ip = WiFi.localIP();

Serial.print(“IP Address: “);

Serial.println(ip);

// display the received signal strength:

long rssi = WiFi.RSSI();

Serial.print(“signal strength (RSSI):”);

Serial.print(rssi);

Serial.println(” dBm”);

}

 

 

QBoat Sunny:

 

You can drag, drop and make the settings using the Node-RED broker in QIoT Suite Lite. You can use HTTP requests to receive the temperature and humidity status from the DHT11 every 0.5 and 1 minute respectively.