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

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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.

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); } } }