The Code
//
// AUTHOR: Rob Tillaart, Terry King, David Loveridge
// VERSION:
// PURPOSE: DHT, RTC and LCD display Arduino
// URL:
// Three examples brought together to create a temp / humidity and time display on a 20/4 LCD.
// RTC and LCD use i2c port (i2c Gnd 5V and pins a4 sda, a5 scl) DHT-11 BRICK unit uses Gnd 5V and pin 2
// Released to the public domain
//
/*-----( Import needed libraries )-----*/
#include <Wire.h> // In standard library
#include <dht.h> // https://arduino-info.wikispaces.com/TemperatureHumidity
#include <LiquidCrystal_I2C.h> // https://arduino-info.wikispaces.com/LCD-Blue-I2C
#include "RTClib.h" // https://arduino-info.wikispaces.com/DS1307_RealTime_Clock_Brick
/*-----( Declare Constants )-----*/
/*-----( Declare objects )-----*/
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); // Set the LCD I2C address Ox3F (Check yours)
RTC_DS1307 rtc; // Create a RealTimeClock object (I set the time in another sketch)
/*-----( Declare Variables )-----*/
dht DHT;
#define DHT11_PIN 4 // use pin 2 on UNO to sample data from DHT module
const int relay1 = 2; //Digital pin that the Relay is connected
const int relay2 = 5; //Digital pin that the Relay is connected
const int relay3 = 6; //Digital pin that the Relay is connected
const int OnHour1 = 10;
const int OnMin1 = 23;
const int OffHour1 = 10;
const int OffMin1 = 24;
const int OnHour2 = 10;
const int OnMin2 = 23;
const int OffHour2 = 10;
const int OffMin2 = 24;
const int OnHour3 = 10;
const int OnMin3 = 23;
const int OffHour3 = 10;
const int OffMin3 = 24;
void setup()
{
Serial.begin(9600);
Serial.println("DHT TEST PROGRAM ");
Serial.print("DHT LIBRARY VERSION: ");
Serial.println(DHT_LIB_VERSION);
Serial.println();
Serial.println("Humidity % \tTemperature (C) \tTime \tDate");
lcd.begin(20, 4); // defines it is a 20 character four line display
rtc.begin(); // Start the RTC library code
}
void loop()
{
// READ DATA
DateTime now = rtc.now();
int chk = DHT.read11(DHT11_PIN);
Serial.print(DHT.humidity, 1);
Serial.print(",\t");
Serial.print("\t");
Serial.print(DHT.temperature, 1);
Serial.print(",\t");
Serial.print("\t");
Serial.print("\t");
Serial.print(now.hour(), DEC);
Serial.print(':');
Serial.print(now.minute(), DEC);
Serial.print(':');
Serial.print(now.second(), DEC);
Serial.print(' ');
Serial.print(now.day(), DEC);
Serial.print('/');
Serial.print(now.month(), DEC);
Serial.print('/');
Serial.println(now.year(), DEC);
lcd.setCursor(0, 0); // start postion of Humidity text on LCD
lcd.print(DHT.humidity, 0); // 0 creates whole number, 1 two decimal
lcd.print("% Humidity ");
lcd.setCursor(14, 0); // start postion of temperature text on LCD
lcd.print(DHT.temperature * 1.8 + 32, 0); //Farhenheit conversion
lcd.setCursor(17, 0);
[b]//lcd.print(”F“);
//lcd.print(DHT.temperature, 0);
//lcd.print(" C");[/b]
lcd.setCursor(0, 1); // start postion of time text on LCD
lcd.print(now.hour(), DEC);
lcd.print(':');
lcd.print(now.minute(), DEC);
lcd.print('.');
lcd.print(now.second(), DEC);
lcd.print('.');
lcd.print(now.year(), DEC);
lcd.print('/');
lcd.print(now.month(), DEC);
lcd.print('/');
lcd.print(now.day(), DEC);
lcd.print(' ');
lcd.setCursor(0, 2); // start postion of time text on LCD
lcd.print("ZONE-1 " "ZONE-2 " "ZONE-3");
//lcd.print(now.second(), DEC);
// You can display in lcd by changing Serial to lcd I have only used time above not date
//lcd.print(now.year(), DEC);
//lcd.print('/');
//lcd.print(now.month(), DEC);
//lcd.print('/');
//lcd.print(now.day(), DEC);
//lcd.print(' ');
//lcd.print(now.hour(), DEC);
//lcd.print(':');
//lcd.print(now.minute(), DEC);
//lcd.print(':');
//lcd.print(now.second(), DEC);
//lcd.println();
delay(1000); // screen - sample & LCD refresh time 1 second although DHT say min 2 seconds but works ok.
if ((now.hour() == OnHour1) && (now.minute() == OnMin1)) {
digitalWrite (relay1, LOW);
}
else if ((now.hour() == OffHour1) && (now.minute() == OffMin1)) {
digitalWrite (relay1, HIGH);
}
if ((now.hour() == OnHour2) && (now.minute() == OnMin2)) {
digitalWrite (relay2, LOW);
}
else if ((now.hour() == OffHour2) && (now.minute() == OffMin2)) {
digitalWrite (relay2, HIGH);
}
if ((now.hour() == OnHour3) && (now.minute() == OnMin3)) {
digitalWrite (relay2, LOW);
}
else if ((now.hour() == OffHour3) && (now.minute() == OffMin3)) {
digitalWrite (relay2, HIGH);
}
}
//
// END OF FILE
//
I have try to get rid of the (c) and change it to (F) with no luck writing to my lcd. When I do change it to read (F) I get the following error. Why can I not print a (F) on my lcd. “UGH”
Arduino: 1.8.5 (Windows 10), Board: “Arduino/Genuino Uno”
Build options changed, rebuilding all
plant_water:83: error: stray ‘\342’ in program
lcd.print(�F“);
^
plant_water:83: error: stray ‘\200’ in program
plant_water:83: error: stray ‘\235’ in program
plant_water:83: error: stray ‘\342’ in program
plant_water:83: error: stray ‘\200’ in program
plant_water:83: error: stray ‘\234’ in program
C:\Users\Documents\Arduino\plant_water\plant_water.ino: In function ‘void loop()’:
plant_water:83: error: ‘F’ was not declared in this scope
lcd.print(�F“);
^
exit status 1
stray ‘\342’ in program
This report would have more information with
“Show verbose output during compilation”
option enabled in File → Preferences.
