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Driver For SHT75 Temperature & Humidity Sensor
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delene



Joined: 13 Oct 2003
Posts: 32

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PostPosted: Mon Jul 21, 2008 1:17 pm     Reply with quote

My code also returns -4.6 and -39.9... :(

I have tried the suggestions above and still no joy
Any other suggestions???
tony-montana



Joined: 12 Jan 2009
Posts: 1

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help
PostPosted: Mon Jan 12, 2009 11:12 am     Reply with quote

hello. I have a problem with the sensor sht1xx and I'm using the same program that I was going to sht75 temperature and gives me a very rare. Can you help me thanks.
Code:
void sensor ()
(
sht_rd (restemp, truehumid) / / measure and calculate
lcd_gotoxy (1.1) / / write in 1.1
printf (lcd_putc, "Temp:% 3.1f% cC" restemp, 223); / / sensor
printf (lcd_putc, "\ nRH:%%% 3.1f" truehumid); / / sensor
)
Pol



Joined: 07 Sep 2006
Posts: 1

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Driver For SHT75 Temperature & Humidity Sensor
PostPosted: Wed Jan 21, 2009 4:29 am     Reply with quote

Hello, i have a problem with this driver , i use 18f1320 @ 8mhz : i don't have answer from sensor, but if tune up the pic-clock (to 16mhz) the sensor start to answer me.... where is the clock-dependent sub of this cod ??? Thanks...
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asmallri



Joined: 12 Aug 2004
Posts: 1558
Location: Perth, Australia

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Re: Driver For SHT75 Temperature & Humidity Sensor
PostPosted: Wed Jan 21, 2009 8:09 am     Reply with quote

Pol wrote:
Hello, i have a problem with this driver , i use 18f1320 @ 8mhz : i don't have answer from sensor, but if tune up the pic-clock (to 16mhz) the sensor start to answer me.... where is the clock-dependent sub of this cod ??? Thanks...


Sound like you might be missing the pull up resistors.
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Diego Oliveira



Joined: 10 Aug 2008
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PostPosted: Fri Jan 23, 2009 12:26 pm     Reply with quote

Someone has a library of SHT75 to PIC18F, I have already commented on the changes in the forum but none solved.

Grateful for the attention.
asmallri



Joined: 12 Aug 2004
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PostPosted: Fri Jan 23, 2009 12:39 pm     Reply with quote

Diego Oliveira wrote:
Someone has a library of SHT75 to PIC18F, I have already commented on the changes in the forum but none solved.

Grateful for the attention.


I sell a driver for the SHT75 - if interested check out: http://www.brushelectronics.com/index.php?page=software#SENSIRION
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crocu



Joined: 02 Nov 2009
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PostPosted: Mon Nov 02, 2009 4:49 am     Reply with quote

Well, some of you you say that read temperature is too high.

Can someone confirm that sht75 code works fine ?

Can you post a sht75 code that works well with any PIC familly ?
+ electronic schematic ?

( Hex file would be also much appreciated )

I would like to display on a LCD, temperature and humidity.

Many thanks for your help.
Nun



Joined: 19 Nov 2009
Posts: 1

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PostPosted: Thu Nov 19, 2009 5:57 am     Reply with quote

Hi!

Mi sht71 sensor is giving me this temperature and humidity results. Can it be a problem of constants when it calculates the real temp &humid? or is it another problem?

T=-11.930000 & H=79.984183
T=592.229974 & H=-1185.778036
T=103.270001 & H=286.722098
T=195.430003 & H=300.089928
T=-11.930000 & H=79.984183
T=592.229974 & H=-1185.778036
T=103.270001 & H=286.722098
T=195.430003 & H=300.089928

I used the library at the beggining of the topic, just changing the values of this function according the datasheet I downloaded from sensirion's web page


Code:
void calculate_data (int16 temp, int16 humid, float & tc, float & rhlin, float & rhtrue)
{
 float truehumid1, rh;

 //calculate temperature reading
 tc = ((float) temp * 0.04) - 40.1;

 //calculate Real RH reading
 rh = (float) humid;

 rhlin = (rh * 0.0367) - (rh * rh * 0.0000015955) - 2.0468;

 //calculate True RH reading
 rhtrue = ((tc - 25.0) * (0.01 + (0.00008 * rh))) + rhlin;
}
kizuc



Joined: 25 Aug 2009
Posts: 6

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LCD to use
PostPosted: Wed Nov 25, 2009 8:38 pm     Reply with quote

Thanks for the driver because I have been able to use it with 18f4550. But I have a problem with the display. Kindly recommend an LCD that can work well with this setup. Or how can I use a 7 segment display for this code ? Especially getting the driver for the 7 segment display.

Thanks
jecottrell



Joined: 16 Jan 2005
Posts: 559
Location: Tucson, AZ

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PostPosted: Sun Feb 28, 2010 1:48 pm     Reply with quote

delene wrote:
My code also returns -4.6 and -39.9... :(

I have tried the suggestions above and still no joy
Any other suggestions???



I know this is an old topic, but I thought I'd post for future readers...

I had a similar problem after laying out a new board and accidentally swapping the data and clock lines. Got them squared away and it works fine.

So, double check your pin defines in the driver file.
n_barroca



Joined: 13 Jul 2010
Posts: 2

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Re: Driver For SHT75 Temperature & Humidity Sensor
PostPosted: Tue Jul 13, 2010 8:07 am     Reply with quote

Hello can you send me the code you use to LCD?
Thanks.
stijn023



Joined: 28 Sep 2010
Posts: 49

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program
PostPosted: Tue Sep 28, 2010 4:45 am     Reply with quote

Hi,
I'm using one of these sensors you used.
But my question is which c program do you used to program it?

Thanks in advance
pisisik44



Joined: 01 Nov 2010
Posts: 1

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PostPosted: Mon Nov 01, 2010 6:42 am     Reply with quote

Hi. If I use 16F84A at 32 KHz or 4 MHz, does it occur any problem?

Thanks for help.
atai21



Joined: 30 Dec 2010
Posts: 31

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PostPosted: Tue Mar 01, 2011 8:50 pm     Reply with quote

Code:
#include <18F4550.h>

#fuses HS,NOWDT,PUT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_B0,stream=ser)
#use rs232(baud=9600, xmit=PIN_B1,stream=ser1)


#include<lcd.c>
#include<sht75.c>

#byte PORTB = 0xf81
#byte PORTC = 0xf82

#define      fanA      PIN_C2
#define      fanB      PIN_C5
#define      buzzer    PIN_C6
#define      nozzle    PIN_C7

void main()
{
 float tempC, humidRH;
 lcd_init();
 sht_init();
printf(lcd_putc, "\b~WELCOME~ ",);
printf(lcd_putc, "\bTEMP&RH READER  ",);

 while(1)
 {
  sht_rd (tempC, humidRH);
  lcd_gotoxy(1,1);
  printf(lcd_putc, "Temp : %3.1f %cC   ", tempC, 223);
  printf(lcd_putc, "\nRH   : %3.1f %%   ", humidRH);
output_high(fanA);
}
 if (tempC>25)
{
output_high(fanA);
output_high(fanB);
}
else if (tempC>35 && humidRH<=50)
{
output_high(fanA);
output_high(fanB);
}

else if (tempC>90 && humidRH<=15)
{

output_high(fanA);
output_high(fanB);
output_high(nozzle);
output_high(buzzer);
printf(lcd_putc, "WARNING!!! ",);
delay_ms(500);        //delay 500 ms between reading to prevent self heating of sensor
}
{

}


}




Hi all,
i use this code for 18f4550 and sht75.the problem is my LCD did not display anything.may i know what is wrong?
microman



Joined: 11 Apr 2011
Posts: 1

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pic16f877a sht75
PostPosted: Mon Apr 11, 2011 9:55 am     Reply with quote

Hey the code works initially but the temperature never increases or decreases. I checked the clock signal and there is no clock signal. I am really struggling can anybody help please.

n.b. I am using a 4mhz crystal.

The code is exactly the same as previously just changed the pin definition.
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