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proteek basuParticipant
Alfred Sir,
I have rechecked everything several times and things are just according to the circuit, LCD is in 8 bit mode only, still I am getting errors.
proteek basuParticipantAlfred Sir,
I have wired up the whole thing as per the circuit and rechecked everything several times, in fact there is a minor mistake in the circuit pin 34 is printed for a second time instead of 35 of the microcontroller, still then I am getting the same error.
proteek basuParticipantI have checked the code using Proteus 8 simulator the display goes blank with the backlight only comming on
proteek basuParticipantThe characters displayed on the LCD are as follows:
$Pd1,Hthdht*8 -1st line
4 3 – 2nd line
proteek basuParticipantThe code has been taken from Engineers Garage only under 8051 projects titled:
How to interface Humidity Sensor with 8051 Microcontroller (AT89C51)
// Program to Interface Humidity sensor with 8051 Microcontroller
#include<reg51.h>sfr lcd_data_pin=0x80;//p0 portsbit rs=P3^0;sbit rw=P3^1;sbit en=P3^2;sbit wr= P3^3;sbit rd= P3^4;sbit intr= P3^5;sfr input_port=0x90; //p1 portunsigned int number=0;unsigned char humidity,lcd,key=0;void delay(unsigned char count){unsigned char i;unsigned int j;for(i=0;i<count;i++)for(j=0;j<1275;j++);}void lcd_command(unsigned char comm){lcd_data_pin=comm;en=1;rs=0;rw=0;delay(1);en=0;}void lcd_data(unsigned char disp){lcd_data_pin=disp;en=1;rs=1;rw=0;delay(1);en=0;}lcd_dataa(unsigned char *disp){unsigned char x;for(x=0;disp[x]!=0;x++){lcd_data(disp[x]);}}void lcd_ini(){lcd_command(0x38); // for using 8-bit 2 row LCDdelay(50);lcd_command(0x0F); // for display on cursor blinkingdelay(50);lcd_command(0x0C);delay(50);lcd_command(0x80);delay(50);}void lcd_display(unsigned int val){unsigned char flg=0;lcd_command(0xC7);if(val==0)lcd_data(‘0’);while(val>0){lcd=val%10;val=val/10;lcd_command(0xC7-flg);lcd_data(lcd+’0′);flg++;}}void display(){key++;number=number+input_port;if(key==11){number=number/key;number=number*10;number=number/25;humidity=number-3;lcd_display(humidity);key=0;number=0;}}void adc(){rd=1;wr=0;delay(2);wr=1;while(intr==1);rd=0;display();delay(2);intr=1;}void main(){lcd_ini();lcd_dataa(“%Rel.Humidity:”);while(1){adc();}} -
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