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nodeMCU DHT11 display and wifi server
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#include <LiquidCrystal_I2C.h> | |
#include <Wire.h> | |
#include <ESP8266WiFi.h> | |
#include <WiFiClient.h> | |
#include <ESP8266WebServer.h> | |
#include <ESP8266mDNS.h> | |
#include <limits> | |
#include <DHT.h> | |
#include <DHT_U.h> | |
#ifndef STASSID | |
#define STASSID "foo" | |
#define STAPSK "bar" | |
#endif | |
const char* ssid = STASSID; | |
const char* password = STAPSK; | |
ESP8266WebServer server(80); | |
int D0 = 16; | |
int D1 = 5; | |
int D2 = 4; | |
int D3 = 0; | |
int D4 = 2; | |
int D5 = 14; | |
int D6 = 12; | |
int D7 = 13; | |
int D8 = 15; | |
int RX = 3; | |
LiquidCrystal_I2C lcd(0x27, 16, 2); | |
#define DHTPIN D0 // Pin which is connected to the DHT sensor. | |
#define DHTTYPE DHT11 // DHT 11 | |
//#define DHTTYPE DHT22 // DHT 22 (AM2302) | |
//#define DHTTYPE DHT21 // DHT 21 (AM2301) | |
DHT_Unified dht(DHTPIN, DHTTYPE); | |
static float lastTemperature = std::numeric_limits<float>::infinity(); | |
void setup() { | |
Serial.begin(115200); | |
Wire.begin(D2, D1); | |
dht.begin(); | |
lcd.begin(16, 2); | |
lcd.home(); | |
// Print a message to the LCD. | |
lcd.print("Measuring temp!"); | |
lcd.setCursor(0, 1); | |
lcd.backlight(); | |
WiFi.mode(WIFI_STA); | |
WiFi.begin(ssid, password); | |
lcd.setCursor(0, 1); | |
lcd.print("connecting"); | |
// Wait for connection | |
while (WiFi.status() != WL_CONNECTED) { | |
lcd.print("."); | |
delay(400); | |
} | |
lcd.setCursor(0, 0); | |
String status1 = String("IP:" + WiFi.localIP().toString() + " "); | |
lcd.print(status1); | |
if (MDNS.begin("esp8266")) { | |
lcd.setCursor(0, 1); | |
lcd.print("connected "); | |
} else { | |
lcd.setCursor(0, 1); | |
lcd.print("MDNS failed "); | |
delay(2000); | |
} | |
server.on("/", handleRoot); | |
server.begin(); | |
} | |
void handleRoot() { | |
String tempString = String(lastTemperature, 3); | |
String d = String("It's " + tempString + " C here!"); | |
if (lastTemperature == std::numeric_limits<float>::infinity()) { | |
d = String("no measurements done yet"); | |
} | |
// digitalWrite(led, 1); | |
server.send(200, "text/plain", d); | |
// digitalWrite(led, 0); | |
} | |
// the loop function runs over and over again forever | |
void loop() { | |
// digitalWrite(D4, HIGH); | |
delay(50); | |
// digitalWrite(D4, LOW); | |
delay(50); | |
lcd.setCursor(0, 1); | |
sensors_event_t event; | |
dht.temperature().getEvent(&event); | |
if (isnan(event.temperature) == false) { | |
lastTemperature = event.temperature; | |
String tempString = String(event.temperature, 3); | |
String d = String(tempString + " 'C "); | |
lcd.print(d); | |
} else { | |
lcd.print("temp fail! "); | |
} | |
server.handleClient(); | |
MDNS.update(); | |
} |
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