How to Deliver Data of Sensor to the Cloud Platform(LinkNode D1)

About: Let's play together! All about pcDuino,Arduino,Raspberry pi and technology. My facebook :Sherry Wu

DHT22 module applies specific digital blocks collection technology and temperature and humidity sensing technology to ensure that products with high reliability and excellent long-term stability. Sensor comprises a capacitive humidity sensing element and a high-precision temperature component, and with a high-performance 8-bit microcontroller connected. Therefore, the product has excellent quality, fast response, anti-interference ability, high cost and so on. Measurable temperature range of the module: -40-80 ℃ ± 0.5 ℃, humidity range: 20-90% RH ± 2% RH. The module is widely used in temperature and humidity regulator, weather station, and other relevant temperature and humidity detection control.

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

Step 1:

Material preparation
LinkNode D1 x 1DHT22 x 1DuPont lineArduino IDE Steps

1. Login ,record the “Device ID” and “API key” ( If there is no account, please sign up. )

1. My Profile -> API key

Step 2:

2. My device->Create DIY Device
Enter Device Name,Device Type , Group Name , the device number is 03, device name and device grouping can be any.

Step 3:

Note: Device Type must be selected 03(Custom device type) .
Click the device you created and record the “Device ID”.

Step 4:

2. Edit and run the code
Modify the “apikey” and “deviceID” with content acquired before

Compile the code and upload.

Step 5:

3. Results
1. Serial Monitor

Step 6:

2. LinkSprite IO

Step 7: Code

#include #include #include #include #include "DHT.h" #define DHTPIN D0 // what pin we're connected to #define DHTTYPE DHT22 // DHT 22 (AM2302) char *tem=""; String apikey = "162d15b0-2c6d-4d44-b288-10f28a527f96"; const char* deviceID="030000000f"; const char* server = ""; WiFiClient client; DHT dht(DHTPIN, DHTTYPE); void setup() { Serial.begin(9600); WiFiManager wifiManager; wifiManager.setAPStaticIPConfig(IPAddress(10,0,1,1), IPAddress(10,0,1,1), IPAddress(255,255,255,0)); wifiManager.autoConnect("LinkNodeAP"); Serial.print("WiFi Connected ...\n"); Serial.println("WiFi connected"); Serial.println("DHTxx test!"); dht.begin(); } void loop() { delay(2000); float h = dht.readHumidity(); float t = dht.readTemperature(); // Read temperature as Celsius (the default) float f = dht.readTemperature(true); // Read temperature as Fahrenheit (isFahrenheit = true) // Check if any reads failed and exit early (to try again). if (isnan(h) || isnan(t) || isnan(f)) { Serial.println("Failed to read from DHT sensor!"); return; } float hif = dht.computeHeatIndex(f, h); // Compute heat index in Fahrenheit (the default) float hic = dht.computeHeatIndex(t, h, false);// Compute heat index in Celsius (isFahreheit = false) Serial.print("Humidity: "); Serial.print(h); Serial.print(" %\t"); Serial.print("Temperature: "); Serial.print(t); Serial.print(" *C "); Serial.print(f); Serial.print(" *F\t"); Serial.print("Heat index: "); Serial.print(hic); Serial.print(" *C "); Serial.print(hif); Serial.println(" *F"); if (client.connect(server,80)) { String postStr ="{"; postStr +="\"action\":\"update\","; postStr +="\"apikey\":\""; postStr += apikey; postStr +="\","; postStr +="\"deviceid\":\""; postStr += deviceID; postStr +="\","; postStr +="\"params\":"; postStr +="{"; postStr +="\"temperature\":\""; itoa(t,tem,10); postStr +=tem; postStr +="\","; postStr +="\"humidity\":\""; itoa(h,tem,10); postStr +=tem; postStr +="\"\r\n"; postStr +="}"; postStr +="}"; client.print("POST /api/http HTTP/1.1\n"); client.print("Host: "); client.print(server); client.print("\nContent-Type: application/json\n"); client.print("Content-Length: "); client.print(postStr.length()); client.print("\n\n"); client.print(postStr); String request = ""; delay(1000); while (client.available()) { char c =; request +=c; } if (request!= NULL) { int index1 = request.indexOf(":{"); int index2 = request.indexOf("},"); String param = request.substring(index1, index2 + 1); String data="\0" ; Serial.print("The param is "); Serial.println(param); client.stop(); Serial.println("waiting ..."); delay(1000); } } }

Be the First to Share


    • Made with Math Contest

      Made with Math Contest
    • Multi-Discipline Contest

      Multi-Discipline Contest
    • Robotics Contest

      Robotics Contest