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I am Maneesh PK, India,I am doing a project to display and control water level in a tank using atmega16 micro controller. I am using a pot and arm mechanism to measure the level of water. I am getting 0V corresponding to zero water level and 2.7V for 100% water level. I am using a 16×2 lcd. I need to use the built-in adc with input at PA0, and need to display the water level as percentage. Continuous variation from 0% to 100% is to be displayed. Will you please help me sir..
hi Maneesh,
refer her for AVR inbuilt ADC
http://www.engineersgarage.com/embedded/avr-microcontroller-projects/adc-circuit
to display no on LCD
http://www.engineersgarage.com/microcontroller/8051projects/display-number-LCD-AT89C51-circuit
ok it is fixed….
now it is displaying the level….
i wrote cammand to turn the motor on and of at desired levels
i am using port a for adc
port b for display data
port d for keypad
and c for lcd control and motor control…
C0, C1 and C2 are display control
and C7 as motor control
my program is like
main
{
//port initialisatn
while(1)
{
//read adc and display
//if less than lower level motor on
//if greater then upper level motor off
}
}
i defined PORTC=ctrl
PC7=motor
and wrote
ctrl=(1<<motr); to turn motor on
but when level is low the line for motor is not steady…..
i mean if i connect an led there it is blinking…
please help……
while(1)
{
read adc();
if (adc<lower levl)
{
while(adc<upper level)
{
motor is on;
read adc();
}
motor is off;
}
else
motor is off;
}
the motor is turning on at lower level. but it is not getting off. it is getting stuck inside the while loop…
while(1)
{
adc_init();
adcout=adc_getvalue(0);
_delay_ms(1);
LCD_cmd(0xc0);
char ready[50];
itoa(adcout,ready,10);
LCD_write_string(ready);
LCD_write_string(“% “);
_delay_ms(1);
PORTD=0xF0; //set all the input to one
value=PIND; //get the PORTD value in variable “value”if(value!=0xf0) //if no key is pressed value changed
{
key=’0′;
check1();
check2();
check3();
check4();if (key==’M’)
{
Menu();
}
else if (key==’0′)
{
}
else
{
ctrl=(1<<buzz);
_delay_ms(100);
ctrl=(0<<buzz);
_delay_ms(1);
}}
if (adcout<00001010)
{while (adcout<=00101100)
{
ctrl=(1<<motr)|(1<<led);
_delay_ms(1);
adc_init();
adcout=adc_getvalue(0);
_delay_ms(1);
}
ctrl=(0<<motr)|(0<<led);
}else
{
ctrl=(0<<motr)|(0<<led);
}
}}
if motor is once turned on, i should have to reset to turn it off even after lelev cross higher level
pls help
what is the varible type of adcout???
is that char, uchar, int, uint???
try to use voilatile uint16_t <variable name>;
And in the loops you using
”
if (adcout<00001010)
{while (adcout<=00101100)
{“
is that integer value???
if you are looking for binary value you must write 0b10101010 as same as 0xAA;
let me know till where you have reached
Thanx…..
When i added 0b with the binary value it worked….
I defined adcout as int.
I have variation of 0x00 to 0x32 (0d50).
So i just multiplied adcout by 2 (0b10)
Converted into decimal charactor by itoa()
and desplayed.
Now it is working…
I also have a 4×4 keypad.
And i need to change the limits using it
The keys are like
Menu 1 2 3
Back 4 5 6
Exit 7 8 9
Delete Left 0 Right
So while working if i type 50 for lower limit and 95 for higher limit and set it, after that the motor should turn on when level goes below 50%. and off above 95%.
I was doing like this.
When higher limit option is selected it will call the function higher_limit()
void higher_limit(void){init_LCD();LCD_write_string(“ENTER LIMIT”);LCD_cmd(0xC0);key=0;int i;i=0;while(1){PORTD=0xF0;value=PIND;key=0;_delay_ms(100);if (value!=0xf0){check1();check2();check3();check4();if (key==’M’){init_LCD();LCD_write_string(“LIMIT IS SET”);LCD_cmd(0x0c);LCD_write_string(h_l);LCD_cmd(0xc0);_delay_ms(500);main();}else if (key==’B’){edit_limits();}else if (key==’E’){main();}else if (key==’1′){LCD_write_string(“1”);_delay_us(1);h_l=1;}else if (key==’2′){LCD_write_string(“2”);_delay_us(1);h_l=2;}else if (key==’3′){LCD_write_string(“3”);_delay_us(1);h_l
;}else if (key==’4′){LCD_write_string(“4”);_delay_us(1);h_l=4;}else if (key==’5′){LCD_write_string(“5”);_delay_us(1);h_l=5;}else if (key==’6′){LCD_write_string(“6”);_delay_us(1);h_l=6;}else if (key==’7′){LCD_write_string(“7”);_delay_us(1);h_l=7;}else if (key==’8′){LCD_write_string(“8”);_delay_us(1);h_l=8;}else if (key==’9′){LCD_write_string(“9”);_delay_us(1);h_l=9;}else if (key==’Z’){LCD_write_string(“0”);_delay_us(1);h_l=0;}else if (key==’D’){LCD_cmd(0x10);LCD_write_string(” “);_delay_us(1);LCD_cmd(0x10);i=i-1;}i=i+1;}}}I was planning to convert h_l into some integer value and compare…But it is not working…Also for delete what i have done is thatmove cursor left;print one space;move cursor left;is there any other way for it?…I defined variable h_l as char.char h_l [50];
how can i make it ? ……
this is mt project for
“water level controller usnig two tank”
now we have done to make prograam in programming in C
but we not make in keil software bcz we dont know that
Descripation of project.
” here we have used two tank in
water level controller
now in there we have taked 4 level.
it is
a = lower tank low level
b = lower level high level
c = upper tank low level
d = upper tank high level
here,
condition
1=full tank,
0= empty tank
and we also used to
motor and alarm.
now my program is here
#include<stdio.h>
#include<conio.h>
void main()
{
int a,b,c,d,motor,alarm;
float 1=full, 0=empty;
clrscr();
printf(“/n motor on/off, alarm on/off”);
while
{
switch
case(1);
{
a=1,b=1,c=1,d=1;
motor(off);
alarm(off);
break;
}
case(2);
{
a=1,b=1,c=1,d=0;
motor(off);
alarm(off);
break;
}
case(3);
{
a=1,b=1,c=0,d=0;
motor(on);
alarm(off);
break;
}
case(4);
{
a=1,b=0,c=0,d=0;
motor(on);
alarm(off);
break;
}
case(5);
{
a=0,b=0,c=0,d=0;
motor(off);
alarm(on);
break;
}
default;
}
}
getch();patel pranav v.
gov. polytechnic
rajkot
diploma in e.c.
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