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mojo
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Joined: 01 Oct 2011
Posts: 2404
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 Posted: 08/01/2012 16:53 Post subject: LM35 Tepm. read. with Codevision AVR LCD viewer |
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LM35 TEMPERATURE READINGS APPLICATIONS BY USING codevision AVR LCD viewer
Application temperature readings (temperature monitoring), using an LM35 sensor is a temperature sensor with a relatively cheap price and its output is a voltage that is linear.
According to the LM35 datasheet, to rise 1 degree Celsius will result in changes to the output voltage is 10mV. Where when the temperature is 0 ° Celsius sensor has an offset voltage of 0 V. To get the LM35 datasheet, please download here .
Here I will make temperature readings in units of degrees Celsius with a measurement range of 0 ° -100 ° Celsius. So that the output voltage of the LM35 is 0-1 V.
The output voltage can already be read by the microcontroller through ADC without the need for a voltage amplifier. I have made this application in the form of real (true) and I also simulated using Proteus. Schematic LM35 which is then displayed on the LCD can be viewed above.
As for the program using CodeVision AVR, the following is a complete program listing.
| Code: | int TEMPERATURE;
char temp [8];
suhu_celcius float;
# Conține <mega16>
# Include <stdlib>
# Include <lcd>
# Include <delay>
/ / Alphanumeric LCD Module functions
# Asm
. Equ __lcd_port = 0x15; PORTC
# Endasm
0x40 # define ADC_VREF_TYPE
/ / Read the AD conversion result
read_adc unsigned int (unsigned char adc_input)
{
ADMUX = adc_input | (ADC_VREF_TYPE & 0xff);
/ / Delay needed for the stabilization of the ADC input voltage
delay_us (10);
/ / Start the AD conversion
ADCSRA | = 0x40;
/ / Wait for the AD conversion to complete
while ((ADCSRA & 0x10) == 0);
ADCSRA | = 0x10;
ADCW return;
}
void main (void)
{
/ / Analog Comparator initialization
/ / Analog Comparator: Off
/ / Analog Comparator Input Capture by Timer / Counter 1: Off
ACSR = 0x80;
SFIOR = 0x00;
/ / ADC initialization
/ / ADC Clock frequency: 750.000 kHz
/ / ADC Voltage Reference: AVCC pin
/ / ADC Auto Trigger Source: None
ADMUX = ADC_VREF_TYPE & 0xff;
ADCSRA = 0x84;
/ / LCD module initialization
lcd_init (16);
lcd_clear ();
lcd_gotoxy (0.0);
lcd_putsf ("Electro-control");
lcd_gotoxy (0.1);
lcd_putsf ("LM35 TEMPERATURE SENSOR");
Delay_ms (1000);
while (1)
{
lcd_clear ();
TEMPERATURE = read_adc (0);
suhu_celcius = (float) TEMPERATURE * 500/1023; / / formula to convert Celsius into degrees
lcd_gotoxy (0.0);
lcd_putsf ("Electro-control");
ftoa (suhu_celcius, 1, temp); / / change the data type to data type float array that will be displayed on the LCD
lcd_gotoxy (0.1);
lcd_puts (temp);
lcd_gotoxy (5.1);
lcd_putchar (0xdf); / / display the character degrees
lcd_putsf ("C");
Delay_ms (500);
};
} |
If you want to get the program files in the form of AVR and simulation proteus CodeVision please download the link below.
http://downloads.ziddu.com/downloadfile/15512283/lm35_V2.rar.html |
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