Dewpointer Опции

[Andrejka]

Hi, I found a schematic of simple temperature, huminidity and dewpoint measuring cicruit. Originally device uses: Sht11 sensor, AT90S8535 MCU, and HD44780 like 20x4 LCD. In my project I replace Sht11 with Sht15 (from Sparkfun), At90s8535 is replaced with newer Atmega8535 (Atmel datasheets say - this is a at90s8535 direct repalcement). But this device working incorrectly, so I have only "Sht11 Monitor" label on LCD, without sensor readings. If possible please help me with source code.

Source project:







URL:
Source project - http://www.embedtronics.com/sht11/sht11.html
Source code - http://www.embedtronics.com/sht11/shtdemo1.c
Schematic - http://www.embedtronics.com/sht11/SHT11Sch.pdf


My device show only this label:



I tried to simulate device in Proteus simulator but this program show the same screen, without sensor readings, only label.


Thank You!

[Andrejka]

Thanks for reply! Maybe I just simple attach a watch 32768 Hz crystal to TOSC1 ant TOSC2 pins, to run clock correctly? And I solve the "T:1fC H:1f%" readings problem, so I change "sprintf" function features in CodeVision software from "int, width" to "long, width, precision".




But some issue remain in th source code, because with sensor i give this LCd screen:




and without sensor like this (time, and readings are in correct format, but these no data from sensor):




Moddeling in Proteus give the same results. Maybe problem is in this block of code, because its like disabled (I am not programer)...



Thanks!!!

[korobov_michael]

Maybe problem is in this block of code, because its like disabled

Hardly. Such piece of code is present some lower in file.
Tell me please did you change Fuses? As I understand you generated code for 4MHz quartz, but really work with 1MHz internal oscillator (this is important for functions delay_ms, delay_us etc).