https://www.jianshu.com/p/cb0274d612b5

https://timgsa.baidu.com/timg?image&quality=80&size=b9999_10000&sec=1572896567081&di=850e6d2014877a76396298eb9eef2b2b&imgtype=0&src=http%3A%2F%2Flearning.grobotronics.com%2Fwp-content%2Fuploads%2F2013%2F07%2Furl_uploaded_file_135884635050fe598fa6c4e.gif

其他内容再补充，太晚啦。

#include
#include
#include "DHT.h"
#include
#include

#ifdef U8X8_HAVE_HW_SPI
#include
#endif
#ifdef U8X8_HAVE_HW_I2C
#include
#endif
#define SCL 5
#define SDA 4
#define DHTPIN 13
#define DHTTYPE DHT11 // DHT 11

#ifndef STASSID
#define STASSID "******"
#define STAPSK "******"
#endif

const char* ssid = STASSID;
const char* password = STAPSK;

const char* host = "192.168.31.203";
const int httpsPort = 5001;

U8G2_SSD1306_128X32_UNIVISION_1_SW_I2C u8g2(U8G2_R0, /* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ U8X8_PIN_NONE); // Adafruit Feather ESP8266/32u4 Boards + FeatherWing OLED
//U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, /* clock=*/ SCL, /* data=*/ SDA, /* reset=*/ U8X8_PIN_NONE); // All Boards without Reset of the Display

DHT dht(DHTPIN, DHTTYPE);

void setup() {
// put your setup code here, to run once:
u8g2.begin();
u8g2.enableUTF8Print();
Serial.begin(115200);
Serial.println(F("DHTxx test!"));

dht.begin();

Serial.print("connecting to ");
Serial.println(ssid);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
}

uint8_t m = 24;

void loop() {

delay(2000);

// Reading temperature or humidity takes about 250 milliseconds!
// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
float h = dht.readHumidity();
// Read temperature as Celsius (the default)
float t = dht.readTemperature();
// Read temperature as Fahrenheit (isFahrenheit = true)
float f = dht.readTemperature(true);

// Check if any reads failed and exit early (to try again).
if (isnan(h) || isnan(t) || isnan(f)) {
Serial.println(F("Failed to read from DHT sensor!"));
return;
}

// Compute heat index in Fahrenheit (the default)
float hif = dht.computeHeatIndex(f, h);
// Compute heat index in Celsius (isFahreheit = false)
float hic = dht.computeHeatIndex(t, h, false);

Serial.print(F("Humidity: "));
Serial.print(h);
Serial.print(F("% Temperature: "));
Serial.print(t);
Serial.print(F("°C "));
Serial.print(f);
Serial.print(F("°F Heat index: "));
Serial.print(hic);
Serial.print(F("°C "));
Serial.print(hif);
Serial.println(F("°F"));

//u8g2.setFont(u8g2_font_unifont_t_chinese1); // use chinese2 for all the glyphs of "你好世界"
u8g2.setFont(u8g2_font_wqy16_t_gb2312b);
//u8g2.setFont(u8g2_font_6x13_tn);
u8g2.firstPage();
do {
u8g2.setFontDirection(0);
u8g2.clearBuffer();
u8g2.setCursor(10, 13);
u8g2.print("-温度"+(String)t+"C" );
u8g2.setCursor(10, 30);
u8g2.print("-湿度"+(String)h+"%"); // Chinese "Hello World"
u8g2.sendBuffer();

//u8g2.drawStr(0,15,"Hello World!");
}while(u8g2.nextPage());
delay(1000);

WiFiClient client;
Serial.print("connecting to ");
Serial.println(host);

if (!client.connect(host, httpsPort)) {
Serial.println("connection failed");
return;
}

// Wait a few seconds between measurements.
delay(1000);

String url = "/";
Serial.print("requesting URL: ");
Serial.println(url);

// 组拼HTTPS请求的Header
String jsonStr = String("") +
"{\"Humidity\":"+h+","+
"\"Temperature\":"+t+"}";
/*
"{'datastreams':[{" +
"'id':'" + dataId + "'" +
",'datapoints':[{" +
"'value':" + data +
"}]}]}";
*/
Serial.println(jsonStr);
String getStr = String("POST ") + url + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"User-Agent: arduino\r\n" +
"Connection: close\r\n";

client.print(getStr); // 发送Headers头
client.print(String("") + "Content-Length:" + jsonStr.length() + "\r\n\r\n"); // 发送Header头-数据内容长度(注意:\r\n\r\n是结尾)
client.print(jsonStr); // 发送json数据

Serial.println("request sent");

Serial.println("==========");
Serial.println("send was:");
Serial.println(jsonStr); // 打印发送的请求数据
Serial.println("reply was:");
String line = "";
while (client.connected() || client.available())
{
if (client.available())
{
line = client.readStringUntil('\n');

}
}
Serial.println(line);
Serial.println("==========");

}