Hi.
Now when winter is here, i have thought about buiding a indoor garden for my Venus fly trap plants.
so need to have a arduino project that checks the temperature and humidity level and a RTC for the led panels to turn off and turn on! i have plans to extens the project later to grown tropical fruites, for now i am only interessted in my blood thirsty plants.
Is here anyone that have builded a similuar project? i have been looking around on the internet that might have builded the project so i dident have to deal with coding.
Is there anyone on the Arduino forum that likes to share the code with me? or iif you could give me a simple code that i can work up with time.
i own:
1X Arduino uno
1X Arduino sensor shield version 4.0
1X liquidcrystal lcd
1X Real Time Clock
Few 120mm computer chassi fans.
thank you very much
i have tried this code
#include <dht11.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
/-----( Declare objects )-----/
// set the LCD address to 0x27 for a 20 chars 4 line display
// Set the pins on the I2C chip used for LCD connections:
// addr, en,rw,rs,d4,d5,d6,d7,bl,blpol
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); // Set the LCD I2C address
dht11 DHT11;
/-----( Declare Constants, Pin Numbers )-----/
#define DHT11PIN 2
void setup() /----( SETUP: RUNS ONCE )----/
{
Serial.begin(9600); //(Remove all 'Serial' commands if not needed)
lcd.begin(20,4); // initialize the lcd for 20 chars 4 lines, turn on backlight
lcd.backlight();
// Print a message to the LCD.
//lcd.setCursor(0, 1);
lcd.print("DHT11 Temp/Humid");
}/--(end setup )---/
void loop() /----( LOOP: RUNS CONSTANTLY )----/
{
int chk = DHT11.read(DHT11PIN);
Serial.print("Read sensor: ");
switch (chk)
{
case 0: Serial.println("OK"); break;
case -1: Serial.println("Checksum error"); break;
case -2: Serial.println("Time out error"); break;
default: Serial.println("Unknown error"); break;
}
lcd.setCursor(0, 1);
lcd.print("C=");
lcd.print((float)DHT11.temperature, 0);
Serial.print("Temperature (oC): ");
Serial.println((float)DHT11.temperature, 2);
lcd.print(" F=");
lcd.print(Fahrenheit(DHT11.temperature), 0);
Serial.print("Temperature (oF): ");
Serial.println(Fahrenheit(DHT11.temperature), 2);
lcd.print(" H=");
lcd.print((float)DHT11.humidity, 0);
lcd.print("%");
Serial.print("Humidity (%): ");
Serial.println((float)DHT11.humidity, 2);
Serial.print("Temperature (K): ");
Serial.println(Kelvin(DHT11.temperature), 2);
Serial.print("Dew Point (oC): ");
Serial.println(dewPoint(DHT11.temperature, DHT11.humidity));
Serial.print("Dew PointFast (oC): ");
Serial.println(dewPointFast(DHT11.temperature, DHT11.humidity));
delay(2000);
}/* --(end main loop )-- */
/-----( Declare User-written Functions )-----/
//
//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;
}
// dewPoint function NOAA
// reference: Algorithms - Schlatter and Baker
double dewPoint(double celsius, double humidity)
{
double A0= 373.15/(273.15 + celsius);
double SUM = -7.90298 * (A0-1);
SUM += 5.02808 * log10(A0);
SUM += -1.3816e-7 * (pow(10, (11.344*(1-1/A0)))-1) ;
SUM += 8.1328e-3 * (pow(10,(-3.49149*(A0-1)))-1) ;
SUM += log10(1013.246);
double VP = pow(10, SUM-3) * humidity;
double T = log(VP/0.61078); // temp var
return (241.88 * T) / (17.558-T);
}
// delta max = 0.6544 wrt dewPoint()
// 5x faster than dewPoint()
// reference: Dew point - Wikipedia
double dewPointFast(double celsius, double humidity)
{
double a = 17.271;
double b = 237.7;
double temp = (a * celsius) / (b + celsius) + log(humidity/100);
double Td = (b * temp) / (a - temp);
return Td;
}
i get this error.
Arduino: 1.6.6 (Windows 10), Board: "Arduino/Genuino Uno"
sketch_nov28b:9: error: 'POSITIVE' was not declared in this scope
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); // Set the LCD I2C address
^
exit status 1
'POSITIVE' was not declared in this scope
This report would have more information with
"Show verbose output during compilation"
enabled in File > Preferences.
When you don't use code tags, the un-enclosed code can lose things like [ and /, because it interprets the characters as mark-up code.
In addition to making your code more accessible, the code tags also protect it from reformatting or mis-interpretation.
So, placing your (rather long) code in tags should get you more answers.
got it, thank you.
so how do i add the RTC for turn on and off the led panel i soldered?
i need to have it on 16 houers and off 8 houers everyday, simulate the day and night.
i just meet another issue with the code, when i run the Serial monitor with that code i get nothing.
But when i change to exampel code for DHT test it reads.
i have noticed the code i am running has #include <dht11.h> and not #include "DHT.h".