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tieungu13
Joined: 03 Mar 2010
Posts: 6
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| one question about SHT71 |
 Posted: Thu Jul 08, 2010 11:26 am |
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I used Sht71. Driver of sht71 I got on this website, and example I get on this website too. But I get value of Temp = -39.9 and hump = -4.6% all the time. Pin of sht71 PIN_1 (PC0 - clock), 2 (VCC pull 10K), 3 (Ground), 4 (Data and pull 10k -PIN C1). Like on datasheet of SHT7X. I see on the topic about SHT71 this website someone had a problem like me, but they haven't solved this problem. Help me. I'm from VietNam.
| Code: |
//////////////////////////////////////main C /////////////////////////
#include "C:\Users\Thanh Hai\Desktop\test71\main.h"
#fuses HS,NOWDT,PUT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#include <SHT71.c>
#include <lcd_lib_4bit.c>
void main()
{
float restemp, truehumid;
set_tris_c(0xff);
lcd_init();
sht_init();
output_low(PIN_C0);///
output_high(PIN_C1);
while(1)
{
restart_wdt();
sht_rd (restemp, truehumid);
LCD_SetPosition(0);
printf(LCD_putchar, "Temp : %3.1f C ",restemp);
LCD_SetPosition(40);
printf(LCD_putchar, "\nRH : %3.1f %% ", truehumid);
delay_ms(50); //delay 500 ms between reading to prevent self heating of sensor
}
}
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| Code: |
//////////////////////////////SHT71////////////////////////////////
///////////////////////////////////////////////////////////////////////////////
// //
// Driver file for SHT75 Temperature & Humidity Sensor //
// //
// ***** To initialise SHT75 sensor upon power up ***** //
// //
// Function : sht_init() //
// Return : none //
// //
// //
// ***** To measure and caluculate SHT75 temp & real RH ***** //
// //
// Function : sht_rd (temp, truehumid) //
// Return : temperature & true humidity in float values //
// //
///////////////////////////////////////////////////////////////////////////////
#define sht_data_pin PIN_C1
#define sht_clk_pin PIN_C0
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SHT71 Driver:
http://www.ccsinfo.com/forum/viewtopic.php?t=28564 |
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asmallri
Joined: 12 Aug 2004
Posts: 1635
Location: Perth, Australia
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| Posted: Mon Jul 12, 2010 1:09 am |
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Sounds like you may have connected it up wrongly and then killed it. Been there, done that.
_________________
Regards, Andrew
http://www.brushelectronics.com/software
Home of Ethernet, SD card and Encrypted Serial Bootloaders for PICs!! |
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