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!

[B0SC0]

I, too, am working on this project and have a problem.

I am using original code, Codevision to compile, AT90S8035-8JI 44 PIN PLCC, 4mhz crystal
20X4 LCD HITACHI COMPATIBLE W/backlight 16 pin connector, SHT11,
PCB that I created.
I have verified all voltages, crystal running at 4 mhz okay.

The problem I am having is the LCD. All character 20x4 are full on blocks. No data. LCD connected to atmel PC0-PC2(lcd pins 4-6) + PC4 - PC7 port(lcd pins 11-14).
In codevision I set the lcd for 20 characters and 4mhz. What other settings do I need to make to at least to get the lcd working right?
I believe hardware is okay, but firmware is not correct.

[korobov_michael]

Well, first of all give me please a couple of your code. 


After startup all LCDs have the first string is filled by black blocks, and the second is empty. So if in your LCD all strings are filled try to check the contrast

[B0SC0]

Well, first of all give me please a couple of your code. 


After startup all LCDs have the first string is filled by black blocks, and the second is empty. So if in your LCD all strings are filled try to check the contrast

The code was posted at the beginning of the thread. It is the original code.

The contrast control is fine. I can dim or max the contrast. It is a 4 line x 20 character lcd that is called for in the original project(also posted at the beginning of the thread).

All four lines are just blocks without any data/characters.

Attached is my schematic.

I am new to atmel and I am not sure if I have the initial settings correct for burning this code.

I know the code has been altered to make the data correct, but right now I just want to get the lcd working right.

Thanks

B0SC0

Прикрепленные файлы

 LCD_TEMP.pdf ( 286.65 килобайт ) Кол-во скачиваний: 123

 

[Andrejka]

The code was posted at the beginning of the thread. It is the original code.

The contrast control is fine. I can dim or max the contrast. It is a 4 line x 20 character lcd that is called for in the original project(also posted at the beginning of the thread).

All four lines are just blocks without any data/characters.

Attached is my schematic.

I am new to atmel and I am not sure if I have the initial settings correct for burning this code.

I know the code has been altered to make the data correct, but right now I just want to get the lcd working right.

Thanks

B0SC0

Just define which MCU port is connected to LCD. In original code this is a PORT A, but LCD connected to PORT C (mistake?).
Change code to:

CODE

// Alphanumeric LCD Module functions
#asm
.equ __lcd_port=0x15 ;PORTC
#endasm
#include <lcd.h>

Regards

[B0SC0]

Just define which MCU port is connected to LCD. In original code this is a PORT A, but LCD connected to PORT C (mistake?).
Change code to:

CODE

// Alphanumeric LCD Module functions
#asm
.equ __lcd_port=0x15 ;PORTC
#endasm
#include <lcd.h>

Regards

Yes, I had already changed that, still no luck.

I also defined in codewizard, lcd,20,4mhz,fast start, no protection, Memory model
Small
External RAM size : 0
Data Stack size : 192


How should I set up codevision c compiler code generator parameters?

I am not sure of all the steps.
I can build all but not sure if all the parameters are right.
Do I need to include math.h,stdio.h,delay.h,along with lcd.h when I build all?

thanks

[Andrejka]

Yes, I had already changed that, still no luck.

I also defined in codewizard, lcd,20,4mhz,fast start, no protection, Memory model
Small
External RAM size : 0
Data Stack size : 192


How should I set up codevision c compiler code generator parameters?

I am not sure of all the steps.
I can build all but not sure if all the parameters are right.
Do I need to include math.h,stdio.h,delay.h,along with lcd.h when I build all?

thanks

First I change "sprintf" function features in CodeVision software from "int, width" to "float, width, precision". Twice I change for Mega8535 "Data Stack Size" upto 256 bytes. All headers listed in original code must be included.

Сообщение отредактировал Andrejka - Jan 25 2009, 17:50