显示DHT1306温度数据时如何正确刷新Adafruit 11 OLED?

Question

我的OLED上的温度数据没有更新。 无论如何，温度值保持不变。

我使用的是带有 DHT11 温度/湿度传感器、Adafruit ssd1306 oled 和 2 个按钮的ESP8266。

我的代码在 Web 服务器上显示温度，该温度在页面刷新时工作并更新良好。 现在，如果你按下一个按钮，字符串"Test！"将出现在OLED上。 如果按下另一个按钮，将显示温度。

但是，如果我再次按下按钮或再次按下"测试！"按钮和温度按钮，温度永远不会更新。 因此，它不会刷新当前温度数据。 我不确定这是否只是我的 oled 无法正确清除的问题，或者我的代码是否不允许 buttonpress(( 函数使用新的临时数据进行更新。 或者两者兼而有之？

关于我可以做些什么来让 oled 像 Web 服务器一样使用当前温度数据刷新的任何建议？

// Including the ESP8266 WiFi library
#include <ESP8266WiFi.h>
#include <DHT.h> // temp and humid sensor
// We need to include Wire.h for I2C communication
#include <Wire.h>
#include <SPI.h>
#include <Adafruit_SSD1306.h>
#define OLED_RESET LED_BUILTIN
Adafruit_SSD1306 display(OLED_RESET);

// 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

int pushButton1 = 16;
int pushButton2 = 10;

int buttonState1 = 0;
int buttonState2 = 0;

// Replace with your network details
const char* ssid = "MyUsername";
const char* password = "MyPassword";
// Web Server on port 80
WiFiServer server(80);
// DHT Sensor
const int DHTPin = 2;
// Initialize DHT sensor.
DHT dht(DHTPin, DHTTYPE);
// Temporary variables
static char celsiusTemp[7];
static char fahrenheitTemp[7];
static char humidityTemp[7];
void setup() {
pinMode(pushButton1, INPUT);
pinMode(pushButton2, INPUT);
// Initializing serial port for debugging purposes
Serial.begin(115200);
delay(10);

// by default, we'll generate the high voltage from the 3.3v line internally! (neat!)
display.begin(SSD1306_SWITCHCAPVCC, 0x3D);  // initialize with the I2C addr 0x3D (for the 128x64)
// init done
// Show image buffer on the display hardware.
// Since the buffer is intialized with an Adafruit splashscreen
// internally, this will display the splashscreen.
display.display();
delay(2000);
// Clear the buffer.
display.clearDisplay();

dht.begin();
// Connecting to WiFi network
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
// Starting the web server
server.begin();
Serial.println("Web server running. Waiting for the ESP IP...");
delay(10000);
// Printing the ESP IP address
Serial.println(WiFi.localIP());
}
// runs over and over again
void loop() {
buttonpress();
WiFiClient client = server.available();
if (client) {
Serial.println("New client");
// bolean to locate when the http request ends
boolean blank_line = true;
while (client.connected()) {
if (client.available()) {
char c = client.read();
if (c == 'n' && blank_line) {
// 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);
// You can delete the following Serial.print's, it's just for debugging purposes
Serial.print("Humidity: ");
Serial.print(h);
Serial.print(" %t Temperature: ");
Serial.print(t);
Serial.print(" *C ");
Serial.print(f);
Serial.print(" *Ft Heat index: ");
Serial.print(hic);
Serial.print(" *C ");
Serial.print(hif);
Serial.print(" *F");
Serial.print("Humidity: ");
Serial.print(h);
Serial.print(" %t Temperature: ");
Serial.print(t);
Serial.print(" *C ");
Serial.print(f);
Serial.print(" *Ft Heat index: ");
Serial.print(hic);
Serial.print(" *C ");
Serial.print(hif);
Serial.println(" *F");
}
client.println("HTTP/1.1 200 OK");
client.println("Content-Type: text/html");
client.println("Connection: close");
client.println();
// your actual web page that displays temperature and humidity
client.println("<!DOCTYPE HTML>");
client.println("<html>");
client.println("<head></head><body><h1>ESP8266 - Temperature and Humidity</h1><h3>Temperature in Celsius: ");
client.println(celsiusTemp);
client.println("*C</h3><h3>Temperature in Fahrenheit: ");
client.println(fahrenheitTemp);
client.println("*F</h3><h3>Humidity: ");
client.println(humidityTemp);
client.println("%</h3><h3>");
client.println("</body></html>");     
break;
}
if (c == 'n') {
// when starts reading a new line
blank_line = true;
}
else if (c != 'r') {
// when finds a character on the current line
blank_line = false;
}
}
}  
// closing the client connection
delay(1);
client.stop();
Serial.println("Client disconnected.");
}

}   

void buttonpress() {
// read the state of the pushbutton value:
buttonState1 = digitalRead(pushButton1);
buttonState2 = digitalRead(pushButton2);
// check if the pushbutton is pressed.
// if it is, the buttonState is HIGH:
if (buttonState1 == LOW) {     
// turn LED on:    
Serial.println("Button 1 Pushed");
// text display tests
display.setTextSize(1);
display.setTextColor(WHITE);
display.setCursor(0,0);
display.println("Test!");
display.display();
delay(400);
display.clearDisplay();
}
if (buttonState2 == LOW) {     
// turn LED on:    
Serial.println("Button 2 Pushed");
// text display tests
display.setTextSize(2);
display.setTextColor(WHITE);
display.setCursor(0,0);
float f = dht.readTemperature(true);
display.println(f);
display.display();
delay(400);
display.clearDisplay();
}
}   

Answer 1

尝试将 buttonpress(( 放在 while (client.connected((( 循环中

while (client.connected()) {
buttonpress();
if (client.available()) {
char c = client.read();
etc...

并删除行

delay(400);
display.clearDisplay();

从按钮按下，移动显示.clearDisplay((; 在按钮测试前面：

void buttonpress() {
// read the state of the pushbutton value:
buttonState1 = digitalRead(pushButton1);
buttonState2 = digitalRead(pushButton2);
// check if the pushbutton is pressed.
// if it is, the buttonState is HIGH:
if (buttonState1 == LOW) {     
// turn LED on:    
Serial.println("Button 1 Pushed");
// text display tests

display.clearDisplay();
display.setTextSize(1);
display.setTextColor(WHITE);
display.setCursor(0,0);
display.println("Test!");
display.display();

}
if (buttonState2 == LOW) {     
// turn LED on:    
Serial.println("Button 2 Pushed");
// text display tests
display.clearDisplay();
display.setTextSize(2);
display.setTextColor(WHITE);
display.setCursor(0,0);
float f = dht.readTemperature(true);
display.println(f);
display.display();

}
}   

注意：dht.readTemperature可能需要1秒，因此按第二个按钮可能会影响服务器响应