SOLVED How To run DHT11 with U8g

Projects Programming
1

I have a question for the knowledgeable members of the forum , with regards to Temp, Humi, and Press.

Question 1. I have a 12864J display running U8glib, DS3231, DHT11, showing time and date but am having trouble to get the DHT11 to show temp C/F on the display, I have looked at the tutorial on U8g and am having trouble understanding the draw.str function to show temp C/F.
Have includes the program for Q1,

#include "U8glib.h"
#include <DS1307.h>
#include "DHT.h"

U8GLIB_ST7920_128X64_4X u8g(4,3,2); //12864J display
//U8GLIB_ST7920_128X64_1X u8g(10); //12864ZW display
DS1307 rtc(A4, A5);

#define DHTPIN 7
#define DHTTYPE DHT11

 float t=0;
 int a,b;
 int tempC, rh, tempF, tempI;
 byte zero = 0x00;

DHT dht(DHTPIN,DHTTYPE);

void setup() 
{
  // flip screen, if required
   //u8g.setRot180();
   
   // Set the clock to run-mode
  rtc.halt(false);
  
  // The following lines can be commented out to use the values already stored in the DS1307
  //rtc.setDOW(WEDNESDAY);        // Set Day-of-Week to SUNDAY
  //rtc.setTime(12, 0, 0);     // Set the time to 12:00:00 (24hr format)
  //rtc.setDate(3, 10, 2010);   // Set the date to October 3th, 2010

}  
   
void loop() 
{
  /* Start of a picture loop */
  u8g.firstPage();  
  
  /* Keep looping until finished drawing screen */
  do 
  {
    /* Set the font */
    u8g.setFont(u8g_font_courB14);
    u8g.drawStr( 22, 22, rtc.getTimeStr());
    u8g.setFont(u8g_font_6x10);
    u8g.drawStr( 50, 35, rtc.getDateStr());
    u8g.setFont(u8g_font_6x10);
    u8g.drawStr( 23, 35, rtc.getDOWStr(FORMAT_SHORT));
    
    
  // Reading temperature or humidity takes about 250 milliseconds!
  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
  float h = dht.readHumidity();
  float t = dht.readTemperature();
  float f = dht.readTemperature(true);
  float i = dht.computeHeatIndex(f, h); //Heat Index
  tempF = (int)(tempC * 9.0 / 5.0) + 32.0;
  tempC = (int)t;
  tempI = (int)i;
  rh   = (int)h;
    
    
    /* Draw a simple border */
    u8g.drawFrame(3,3,121,58);
    
    u8g.setFont(u8g_font_6x10);
    u8g.drawStr( 15, 45, "Temp");
    //u8g.drawStr( 45, 45, ); //Temp C here
    u8g.setFont(u8g_font_6x10);
    u8g.drawStr( 60, 45, "C");
    
    u8g.setFont(u8g_font_6x10);
    //u8g.drawStr( 70, 45, ); //Temp F here
    u8g.drawStr( 90, 45, "F");
  
  }while(u8g.nextPage());
}

Hope someone can help.
How to part 2 has been re posted

2

Question 2.

Can you maybe make two posts about this? This is all a bit of a mouthful.

3

How can the second question be removed so that it can be re posted.

4

You edit your question. Cut the second question from it (Edit menu in your browser). Then make a new question and paste it in.

5

JQuinn:
Question 2. How can you get a DS3231, BMP180, running at 3.3v to work together on the I2C bus on a graphic display using either GLCD/UTFT/U8g, both work singley on a graphic display but when you add the bmp program to the time display, time is stopped but is still displayed and the bmp still functions normally.
I have a similar setup, running on a 20x4 LCD with the DS and BMP working together.
I have Googled the web and looked on the forum for answers but no information has been found, there is info on DS’s , BMP’s and I2C bus singley but not working together.

Hope someone can help.

There should be no specific issue here. I would first determine if you're able to read the values correctly (eg, writing to serial). I've had spooky problems with BMP180's...