Hi All,
I am having an issue with data refreshing on an LCD, but the variable is updating on a serial print.
The background of the project:
There are two temperature sensors taking a) the room temp (DHT11) b) the temp of a radiator (DS18B20)
The temperatures are uploaded to a webpage and an LCD screen, also a serial output.
When the radiator is on, temperature rises to above 25 degrees and turns on a fan to blow the hot air round the room.
The LCD will then update to show the fan as running.
when the temp drops below 25 (radiator is off) the fan also goes off
The LCD then show the fan as off.
Except:
when the temperature goes above 25 the LCD stops updating the rad temperature, but the serial print does.
The satus does not show as running.
This is until the temp drops below 25, when it then updates temprature and status shows as off.
The code is below, and i am at a loss as to why this happens.
Any advice would be gratefully recieved as i think i am just missing something silly, and if i have missed information you need i am sorry, and please do let me know
Many thanks
Jon
#include <ESP8266WiFi.h>
#include <WiFiClient.h>
#include <ESP8266WebServer.h>
#include <ESP8266mDNS.h>
#include <OneWire.h>
#include <DallasTemperature.h>
#include <Wire.h>
#include <LCD.h>
#include <LiquidCrystal_I2C.h>
#define I2C_ADDR 0x27 // <<----- Add your address here. Find it from I2C Scanner
#define BACKLIGHT_PIN 3
#define En_pin 2
#define Rw_pin 1
#define Rs_pin 0
#define D4_pin 4
#define D5_pin 5
#define D6_pin 6
#define D7_pin 7
LiquidCrystal_I2C lcd(I2C_ADDR,En_pin,Rw_pin,Rs_pin,D4_pin,D5_pin,D6_pin,D7_pin);
#define motor 5
int hold=10000;
int last_do=0;
int fan=0;
String fanstate;
String statis = "OFF";
///set up temps on DHT11////
//Celsius to Fahrenheit conversion
double Fahrenheit(double celsius)
{
return 1.8 * celsius + 32;
}
//Celsius to Kelvin conversion
double Kelvin(double celsius)
{
return celsius + 273.15;
}
double dewPoint(double celsius, double humidity)
{
// (1) Saturation Vapor Pressure = ESGG(T)
double RATIO = 373.15 / (273.15 + celsius);
double RHS = -7.90298 * (RATIO - 1);
RHS += 5.02808 * log10(RATIO);
RHS += -1.3816e-7 * (pow(10, (11.344 * (1 - 1/RATIO ))) - 1) ;
RHS += 8.1328e-3 * (pow(10, (-3.49149 * (RATIO - 1))) - 1) ;
RHS += log10(1013.246);
// factor -3 is to adjust units - Vapor Pressure SVP * humidity
double VP = pow(10, RHS - 3) * humidity;
// (2) DEWPOINT = F(Vapor Pressure)
double T = log(VP/0.61078); // temp var
return (241.88 * T) / (17.558 - T);
}
double dewPointFast(double celsius, double humidity)
{
double a = 17.271;
double b = 237.7;
double temp = (a * celsius) / (b + celsius) + log(humidity*0.01);
double Td = (b * temp) / (a - temp);
return Td;
}
#include <dht11.h>
dht11 DHT11;
#define DHT11PIN 13
int overide = 0;
/// end temps set up
//start onewire temp setup
#define ONE_WIRE_BUS 12
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature sensors(&oneWire);
//end one wire
///start wifi setup///
MDNSResponder mdns;
ESP8266WebServer server(80);
String webPage;
String webPage1;
const char* ssid = "xxxxxxxx"; //wifi name
const char* password = "xxxxxx"; //wifi password
///end wifi set up///
void setup() {
// set up wifi //
pinMode(motor, OUTPUT); //led pin 16
pinMode(13, OUTPUT); //running
pinMode(15, OUTPUT); //on off
digitalWrite(15, HIGH);
Serial.begin(74880);
delay(100);
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
WiFi.config(IPAddress(192,168,1,18), IPAddress(192,168,1,1), IPAddress(255,255,255,0));
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.println("IP address: ");
Serial.println(WiFi.localIP());
if (mdns.begin("esp8266", WiFi.localIP()))
Serial.println("MDNS responder started");
server.on("/", [](){
server.send(200, "text/html", webPage);
});
server.on("/socket1On", [](){
server.send(200, "text/html", webPage);
// Turn off LED
digitalWrite(motor, HIGH);
delay(1000);
});
server.on("/socket1Off", [](){
server.send(200, "text/html", webPage);
//Turn on LED
digitalWrite(motor, LOW);
overide = 0;
Serial.println("Do low 1 ");
});
server.begin();
Serial.println("HTTP server started");
// end wifi set up
// start temp set up //
Serial.begin(74880);
Serial.println("DHT11 TEST PROGRAM ");
Serial.print("LIBRARY VERSION: ");
Serial.println(DHT11LIB_VERSION);
Serial.println();
// end temo set up //
//one wire
Serial.println("Dallas Temperature IC Control Library Demo");
// Start up the library
sensors.begin();
// end one wire
//set up LCD //
Wire.begin(D4,D5);
lcd.begin (20,4); // <<----- My LCD was 16x2
// Switch on the backlight
lcd.setBacklightPin(BACKLIGHT_PIN,POSITIVE);
lcd.setBacklight(HIGH);
lcd.home (); // go
lcd.setCursor (2,0);
lcd.print("**FAN CONTROL**");
lcd.setCursor (0,1);
lcd.print("Room Temp:");
lcd.setCursor (0,2);
lcd.print("RAD Temp:");
lcd.setCursor (0,3);
lcd.print("Fan Status:");
}
void loop() {
if (millis() - last_do > hold) {
lcd.home ();
readtemp();
onewre();
server.handleClient();
last_do=millis();
}
}
void readtemp(){
Serial.println("\n");
int chk = DHT11.read(DHT11PIN);
Serial.print("Read sensor: ");
switch (chk)
{
case DHTLIB_OK:
Serial.println("OK");
break;
case DHTLIB_ERROR_CHECKSUM:
Serial.println("Checksum error");
break;
case DHTLIB_ERROR_TIMEOUT:
Serial.println("Time out error");
break;
default:
Serial.println("Unknown error");
break;
}
lcd.setCursor (11,1);
lcd.print((float)DHT11.temperature, 2);
lcd.setCursor (16,1);
lcd.print(F("\xDF""C."));
webPage = "<h1>ESP8266 Web Server</h1><p>Fan Over-ride ";
webPage += "<h2>Room Data</h2>";
webPage +="<p>Humidity (%): ";
webPage +=(float)DHT11.humidity, 2;
webPage +="</p><p>";
webPage +="Temperature (°C): ";
webPage +=(float)DHT11.temperature, 2;
webPage +="</p><p>";
webPage +="Temperature (°F): ";
webPage +=Fahrenheit(DHT11.temperature), 2;
webPage +="</p><p>";
webPage +="Temperature (°K): ";
webPage +=Kelvin(DHT11.temperature), 2;
webPage +="</p><p>";
webPage +="Dew Point (°C): ";
webPage +=dewPoint(DHT11.temperature, DHT11.humidity);
webPage +="</p><p>";
webPage +="Dew PointFast (°C): ";
webPage +=dewPointFast(DHT11.temperature, DHT11.humidity);
webPage +="</p>";
}
void onewre(){
// call sensors.requestTemperatures() to issue a global temperature
// request to all devices on the bus
/********************************************************************/
Serial.print(" Requesting temperatures...");
sensors.requestTemperatures(); // Send the command to get temperature readings
Serial.println("DONE");
/********************************************************************/
float temp = sensors.getTempCByIndex(0);
lcd.setCursor (11,2);
lcd.print(temp);
lcd.setCursor (16,2);
lcd.print(F("\xDF""C."));
Serial.print("Temperature is: ");
Serial.print(temp);
webPage += "<h2>Room Data</h2>";
webPage += "Radiator temperature is: ";
webPage += (temp);
webPage += "°C";
if ((temp > 25) and fan == 0) {
digitalWrite(motor, HIGH);
Serial.println("Do high 2 ");
//digitalWrite(13, HIGH);
fan=1;
statis = "Running";
} else if ((temp < 26) and fan == 1){
digitalWrite(motor, LOW);
Serial.println("Do low 2 ");
//digitalWrite(13, LOW);
fan=0;
statis = "OFF";
}
Serial.println(statis);
lcd.setCursor (11,3);
lcd.print(statis);
}
thanks, i will move that!!