我需要帮助，我是Arduino的新手，并且我在NodeMcu 1.0板上运行DHT11传感器，我发现该传感器的湿度读数主要不准确，这使我提出了问题，我想从HTML页面上显示的传感器中添加/减去一个百分比。有人可以提供帮助吗？
ps我使用。
附加了代码。include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#include "DHT.h"
// Uncomment one of the lines below for whatever DHT sensor type you're using!
#define DHTTYPE DHT11 // DHT 11
//#define DHTTYPE DHT21 // DHT 21 (AM2301)
//#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321
MDNSResponder mdns;
// Replace with your network details
const char* ssid = "Temperature_Server";
const char* password = "vishaworld.com";
ESP8266WebServer server(80);
String webPage = "";
// DHT Sensor
const int DHTPin = 4;
DHT dht(DHTPin, DHTTYPE);
static char celsiusTemp[7];
static char fahrenheitTemp[7];
static char humidityTemp[7];
float h, t, f;
void setup(void) {
IPAddress Ip(10, 10, 10, 10);
IPAddress NMask(255, 255, 255, 0);
WiFi.mode(WIFI_AP);
WiFi.softAPConfig(Ip, Ip, NMask);
WiFi.softAP(ssid, password);
delay(1000);
Serial.begin(9600);
Serial.println("");
// Wait for connection
delay(5000);
Serial.println("");
Serial.print("SoftAP IP address: ");
Serial.println(WiFi.localIP());
dht.begin();
if (mdns.begin("esp8266", WiFi.localIP())) {
Serial.println("MDNS responder started");
}
server.on("/", []() {
webPage = "";
webPage += "<!DOCTYPE HTML>";
webPage += "<html>";
webPage += "<head></head><body><h1>Temperature and Humidity</h1><h3>Temperature in Celsius: ";
webPage += "<meta http-equiv="refresh" content="6">" ;
webPage += celsiusTemp;
webPage += "*C</h3><h3>Temperature in Fahrenheit: ";
webPage += fahrenheitTemp;
webPage += "*F</h3><h3>Humidity: ";
webPage += humidityTemp;
webPage += "%</h3><h3>";
webPage += "</body></html>";
server.send(200, "text/html", webPage);
});
server.begin();
Serial.println("HTTP server started");
}
void loop(void) {
server.handleClient();
// 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("Failed to read from DHT sensor!");
strcpy(celsiusTemp, "Failed");
strcpy(fahrenheitTemp, "Failed");
strcpy(humidityTemp, "Failed");
}
else {
// Computes temperature values in Celsius + Fahrenheit and Humidity
float hic = dht.computeHeatIndex(t, h, false);
dtostrf(hic, 6, 2, celsiusTemp);
float hif = dht.computeHeatIndex(f, h);
dtostrf(hif, 6, 2, fahrenheitTemp);
dtostrf(h, 6, 2, humidityTemp);
}
delay(2000);
}
我可能会在传感器中读取湿度后修改湿度读数。这样
来自您的代码的摘要：
// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
float h = dht.readHumidity();
// modify the humidity reading to provide a correction to the value
h = h + h * humidityCorrectionPercentage;
然后在湿度传感器定义所在的文件顶部附近，我将进行以下更改：
// Uncomment one of the lines below for whatever DHT sensor type you're using!
#define DHTTYPE DHT11 // DHT 11
//#define DHTTYPE DHT21 // DHT 21 (AM2301)
//#define DHTTYPE DHT22 // DHT 22 (AM2302), AM2321
// humidity sensor reading modification to modify the reading to more accurate value
// percentage in decimal form so 10% is 0.10 or 25% is 0.25
// use positive vale to increase the reading and a negative value to decrease the reading.
// specify a value of zero if no modification of the reading is needed.
const float humidityCorrectionPercentage = .10;