Mission 7- Weather Station

Daniel Alich Member Staff Member

We are trying something a little bit different here. This program requires you to install a "library file" to understand data from the DHT11 (Digital Temperature and Humidity Sensor) so we can make the weather station function.

Included in this .ZIP file is the instructions for installing the library file OR you should be able to run the program directly from the downloaded folder. You will notice the library files are included in the file folder and will open in a separate tab wile opening the .ino file. There are also instructions in the code if you wish to install the library directly on your computer for future reference.

https://drive.google.com/open?id=1Nyu8g-xSiArth5dkIfAGcH24x8nWFMcj

Daniel Alich, 2017-06-27 18:31:10 -04:00
#20
Andy Eades Member

I couldn't get the above sketch to work. Below is the sketch I created that seems to work with the DHT11.zip libraries in the post and wired as shown.

//
//

#include <LiquidCrystal.h>
#include <dht.h>
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

dht DHT;

#define DHT11_PIN 8
#define DHT21_PIN 5
#define DHT22_PIN 6

void setup()
{
Serial.begin(115200);
Serial.println("DHT TEST PROGRAM ");
Serial.print("LIBRARY VERSION: ");
Serial.println(DHT_LIB_VERSION);
Serial.println();
Serial.println("Type,tstatus,tHumidity (%),tTemperature (C)");
lcd.begin(16, 2);
}

void loop()
{

// READ DATA
Serial.print("DHT11, t");
int chk = DHT.read11(DHT11_PIN);
switch (chk)
{
case DHTLIB_OK:
Serial.print("OK,t");
break;
case DHTLIB_ERROR_CHECKSUM:
Serial.print("Checksum error,t");
break;
case DHTLIB_ERROR_TIMEOUT:
Serial.print("Time out error,t");
break;
default:
Serial.print("Unknown error,t");
break;
}
// DISPLAY DATA
Serial.print(DHT.humidity,1);
Serial.print(",t");
float t = DHT.temperature;
float h = DHT.humidity;
t = t* 9/5 + 32;
Serial.println(t,1);
if (isnan(t) || isnan(h)) {
lcd.setCursor(0, 0);
lcd.print("Failed to read from DHT");
//Serial.println("Failed to read from DHT");
} else {
lcd.clear();
lcd.setCursor(0, 0);
lcd.print("Humidity: ");
lcd.print(h);
lcd.print("%");
lcd.setCursor(0, 1);
lcd.print("Temp: ");
lcd.print(t);
lcd.print(" f");
}
delay(1000);
}
//
// END OF FILE
//
Andy Eades, 2018-08-24 20:28:39 -04:00
#99
Noah Member Saint Clair Shores

Hi,
I'm getting an error code for this sketch. It is saying, "Error compiling for board Arduino Nano"
Any advice?
I used both the Sketch that was included on the thumb drive as well as the code above. The code above however was giving me far more complicatede errors than the included sketch.
Noah, 2020-04-13 14:39:47 -04:00
#138
Elisha Wu Member Revesby

IT don't work for aduino nano oldbootloader or new.
Elisha Wu, 2020-06-12 04:32:25 -04:00
#139

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Daniel Alich Member Staff Member

Andy Eades Member

Noah Member Saint Clair Shores

Elisha Wu Member Revesby

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