ADC0808 channel selection and interferance between channels problem.

[Qaisar Azeemi]

hi friends,

i am getting 3 analog signals at the inputs of ADC0808 and i am displaying it on LCD. they are voltage current and temperature signals. the problem is that when i vary one of the analog input it also effects the data from other inputs. that is if i vary voltage it resutls in the variation of voltage data, current data and temprature data on tha Screen of LCD. i tried my best to isolate it from each other by putting delays and clearing the arrays and data memory locations but the problem is as it is... please help me to rectify my problem...

following is my code:

#include <reg52.h>


 #define select P3
 #define Port P2  // control port
 #define adc_input P1
 #define data_port P0  // data from microcontroller to LCD
 #define sec 50
 #define scan 10

 sbit ADC_A=Port^0;	//ADC
 sbit ADC_B=Port^1;	//ADC
 sbit RS=Port^7;  		//LCD
 sbit E=Port^5;		   //LCD
 sbit ctl=Port^6;		  //LCD
 sbit SC=Port^4;   //ADC
 sbit CLK=Port^3;  //ADC
 sbit ALE=Port^2;  //ADC

 sbit v28=select^4; // carger 28v selected
 sbit v14=select^5;
 sbit v7=select^6;
 sbit off=select^7;
 sbit intr=select^2;
 sbit c28=select^0;
 sbit c14=select^1;
 sbit c7=select^3;
 
unsigned int test_intermediate3=0, test_final=0, select_mem=0, x=0;
unsigned int test_intermediate1[scan], test_intermediate2[3]={0,0,0};
unsigned char temp[]={"Temp:  "}, vna[]={" Volt:    Amp:  "},  hnm[]={"  hr   min     %"}, bnc[]={"Backup:  %Charge"};


		 //------------------- . --------------------------

		void delay(unsigned int msec)
		{
			int i,j;
			for(i=0; i==msec; i++)
				for(j=0; j==1275; j++);

		}

	//...........;;;;;;;;;;..........................	
		
		void long_delay(unsigned int second)
		{
		   int i,j;
		   for (j=0; j<second ; j++)
		  		 for (i=0; i<0xffff; i++);
		}




		//---------------- timer 0 interrupt----------------

		void timer0() interrupt 1
		{
		   		
					CLK=~CLK;		// Toggle port bit p3.5
					TR0=0;         // stop timer
					TH0=0xff;	    // 500hz clock for adc
					TL0=0xff;
					TR0=1;			// start timer
		}

	   	//;;;;;;;;;;;;;;;;;;;;;;;;;;;

		 void switch2(void)
 	{
  		if (v7==1 & v14==0 & v28==0)
			{
				c7=1; c14=0; c28=0;
			}

		else
		if(v14==1 & v7==0 & v28==0)
			{
				c14=1; c7=0; c28=0;
			}
		else
		if (v28==1 & v7==0 & v14==0)
			{
				c28=1; c14=0; c7=0;
			}						  	

	

	}
	  
	   //---------------- External 0 interrupt----------------

		void switching() interrupt 0
		   {
						 
				     intr=1;
					 delay(sec*4);
		   		   select = select_mem;
					  intr=1;
					   delay(sec*4);
						
		   	//	...............---------........................


					   	if(v28==0 & v14==0 & v7==0 & off==1)
				  				{ off=0; v7=1; v28=0; v14=0; }
					
				    else
                        if(v28==0 & v14==0 & v7==1 & off==0)		//e1
                                { v7=0; v14=1; v28=0; off=0; }
					
					else
						if(v28==0 & v14==1 & v7==0 & off==0)		 //e2
						        { v14=0; v28=1; v7=0;  off=0; }
					
					else
						if(v28==1 & v14==0 & v7==0 & off==0)		 //e3
					   			{ v28=0; v14=0; v7=0; off=1; }
															
															 
				
				delay(sec*4);  					 
				intr=1;
				c7=0; c14=0; c28=0;
				delay(sec*4);
			   	select_mem = select;	
			
	
				long_delay(10);
				 switch2(); 

  }

 


		//.................. LCD .................


		void lcd_cmd( unsigned int item )
		{
			data_port=item;  //command on data port p0 of lcd
			RS=0;            // selecting command register of lcd
		//	RW=0;
			E=1;
			delay(1);
			E=0;
		                       
		}




		void lcd_data( unsigned int item )
		{
			data_port=item;  //data on data port p0 of lcd
			RS=1;            // selecting data register of lcd
		//	RW=0;
			E=1;
			delay(1);
			E=0;
		
		}










	  //----------- custom character Generation for Degree symbol-----------

	  void shape()
	  {
	  		
			lcd_cmd(64); 		// first location in CGRAM
			delay(sec);
			lcd_data(2);
			delay(sec);
			lcd_data(5);
			delay(sec);
			lcd_data(2);
			delay(sec);
			lcd_data(0);
			delay(sec);
			lcd_data(0);
			delay(sec);
			lcd_data(0);
			delay(sec);
			lcd_data(0);
			delay(sec);
			lcd_data(0);
			delay(sec);

		
	  }


	  //-------------------- for volt symbol-----------------

	   void shape2()
	  {
	  		
			lcd_cmd(72); 		// second location in CGRAM
			delay(sec);
			lcd_data(0);
			delay(sec);
			lcd_data(0);
			delay(sec);
			lcd_data(17);
			delay(sec);
			lcd_data(17);
			delay(sec);
			lcd_data(17);
			delay(sec);
			lcd_data(10);
			delay(sec);
			lcd_data(4);
			delay(sec);
			lcd_data(0);
			delay(sec);

	
	  }

	 //---------------------- for current symbol-------------------

	  void shape3()
	  {
	  		
			lcd_cmd(80); 		// Third location in CGRAM
			delay(sec);
			lcd_data(0);
			delay(sec);
			lcd_data(0);
			delay(sec);
			lcd_data(4);
			delay(sec);
			lcd_data(10);
			delay(sec);
			lcd_data(17);
			delay(sec);
			lcd_data(31);
			delay(sec);
			lcd_data(17);
			delay(sec);
			lcd_data(0);
			delay(sec);

	
	  }
								





	  //..... Converting binary value of ADC to ASCII value of LCD for Temprature........




	  void convert()
	  {
	  		int s;
					 
			test_final=(((9*test_intermediate3)/5)+32);			 // Farenhite conversion
			
			s=test_final/100;
			test_final=test_final%100;

			lcd_cmd(0xc5);
			delay(sec);
			if (s!=0)
				{
				lcd_data(s+48);	//c5
				delay(sec);
				}
			else
				{
				lcd_cmd(0x06);
				delay(sec);
				}


		  s=test_final/10;
		  test_final=test_final%10;

		  lcd_data(s+48);	   //c6
		  delay(sec);
		  lcd_data(test_final+48);	//c7
		  delay(sec);
		  lcd_data(0);				 // space for degree symbol
		  delay(sec);
		  lcd_data('F');
		  delay(sec);
		  lcd_data(' ');
		  delay(sec);


		//------------------- for Celcius scale----------------

		  test_final=test_intermediate3;



		  s=test_final/100;
			test_final=test_final%100;

			lcd_cmd(0xcB);
			delay(sec);
			if (s!=0)
				{
				  lcd_data(s+48);	// 1st digit MS
					delay(sec);
				}
			else
				{
				  lcd_cmd(0x06);
					delay(sec);
				}



		  s=test_final/10;			 // 2nd digit
		  test_final=test_final%10;	 // 3rd digit LS

		  lcd_data(s+48);  //89
		  delay(sec);
		  lcd_data(test_final+48);	 //88
		  delay(sec);
		  lcd_data(0);		   // space for degree symbol
		  delay(sec);
		  lcd_data('C');
		  delay(sec);
		   lcd_data(' ');
		  delay(sec);
	
		 }







		 // Converting binary value of ADC to ASCII value of LCD for volts


		 void  Convert2()
		 {
		 	int s;
	 //.................... Voltage conversion ............................

					 
		 test_final=test_intermediate3/5;
			
			s=test_final/100;
			test_final=test_final%100;

			 lcd_cmd(0x85);
			delay(sec);
			if (s!=0)
				{
				lcd_data(s+48);
				delay(sec);
				}
			else
				{
				lcd_cmd(0x06);
				delay(sec);
				}


		  s=test_final/10;
		  test_final=test_final%10;

		  lcd_data(s+48);	   
		  delay(sec);
		  lcd_data(test_final+48);	
		  delay(sec);
		  lcd_data(1);
		  delay(sec);
		   lcd_data(' ');
		  delay(sec);
		 }

		//-------------------..................-------------------

		 void  Convert3()
		 {
		 	int s;
	//.................... current conversion ............................

					 
		 test_final=test_intermediate3;
			
			s=test_final/100;
			test_final=test_final%100;

			  lcd_cmd(0x8D);
			delay(sec);
			if (s!=0)
				{
				lcd_data(s+48);
				delay(sec);
				}
			else
				{
				lcd_cmd(0x06);
				delay(sec);
				}


		  s=test_final/10;
		  test_final=test_final%10;

		  lcd_data(s+48);	   
		  delay(sec);
		  lcd_data(test_final+48);
		  delay(sec);
		  lcd_data(2);
		  delay(sec);
	
		 }

	  
	  
	  
	  
	  
	  
	  
	  //.........--------.......Main Program.......-------........

		

		   void main()
		   {

		   		int i,j,k,l,m,n;
				adc_input=0xff; // making p1 as input port
				TMOD=0x01;	   // timer 0,  mode 1
				TH0=0xff;	    // 500hz clock for adc
				TL0=0xff;
				TR0=1;         // timer start

				IE=0x83;		// interrupt enable ; timer interrupt, external interrupt and globle interrupt.
				
			v28=0; v14=0; v7=0; off=1;  // intializing charger selection to 0V
			c28=0; c14=0; c7=0;
			intr=1;

			  select_mem = select;
			  delay(sec);
			   	   
		
				lcd_cmd(0x38);		// initializing LCD module
				delay(sec);

				lcd_cmd(0x0c);
				delay(sec);

				lcd_cmd(0x01);
				 delay(sec);

				lcd_cmd(0x06);
				delay(sec);

									  
				
	//;;;;;;;;;;;;;;-----------;;;;;;;;;;;;;;;
	//......... volt and ampere display........

	       lcd_cmd(0x80);																		    
		   	delay(sec);
		   	 													 
			for(i=0; vna[i]!='\0'; i++)
				{
					lcd_data(vna[i]);
					delay(sec);
				}
	   
	//;;;;;;;;;;;;-----------------------;;;;;;;;;;;;;;;;;
	//..........- Back up and %Charge display ----........

				lcd_cmd(0x90);
			    delay(sec);

			for(i=0; bnc[i]!='\0' ; i++)
				{
					lcd_data(bnc[i]);
					delay(sec);
				}							

									

		//;;;;;;;;;;;;;;-----------;;;;;;;;;;;;;;;
	    //......... ----Temp: display-----........

			lcd_cmd(0xc0);
		 	delay(sec);
		   
			for(i=0; temp[i]!='\0' ; i++)
				{
					lcd_data(temp[i]);
					delay(sec);
				}	


	//;;;;;;;;;;;;;;-------------------------;;;;;;;;;;;;;;;;;
	//.............- hour and minute display ------...........

		    lcd_cmd(0xD0);									   
		   	delay(sec);
		  	
			for(i=0; hnm[i]!='\0'; i++)
				{
					lcd_data(hnm[i]);
					delay(sec);
				}
									
//;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;



				while(1)
				{

				//;;;;;;;;;;;;;;;;;;;;;;;;;;;;;Temprature samples;;;;;;;;;;;;;;;;;;;;;;
					  
					   test_intermediate3=0;
							test_final=0;
						test_intermediate2[0]=0;
						test_intermediate2[1]=0;
						test_intermediate2[2]=0;
						
					
						for(j=0;j<3;j++)
						{
							for(i=0;i<scan;i++)
							{	   ctl=0;
								     delay(10);
								   ADC_A=0;
								   ADC_B=0; // channel 0 is selected   ; pin 26 of ADC

									delay(200);
								
									ALE=0;
									SC=0;
									delay(1);

									 ALE=1;
									 delay(1);
									 SC=1;
									 delay(1);

									 ALE=0;
									 delay(1);
									 SC=0; 
									
									 delay(200);
																		 
									 test_intermediate1[i]=adc_input/scan;
								
								
							}


							for(i=0;i<scan;i++)
							test_intermediate2[j]+=test_intermediate1[i];
						}


						test_intermediate2[0]=test_intermediate2[0]/3;
						test_intermediate2[1]=test_intermediate2[1]/3;
						test_intermediate2[2]=test_intermediate2[2]/3;

						test_intermediate3=test_intermediate2[0] + test_intermediate2[1] + test_intermediate2[2];
					
					

						convert();
						shape();

					long_delay(1);
					ctl=1;
					delay(10);
					  ADC_A=1;
					 ADC_B=0; // channel 1 is selected for voltage

			 //;;;;;;;;;;;;;;;;;  Voltage samples;;;;;;;;;;;;;;;;;;;;;;;;;

				   test_intermediate3=0;
				   test_final=0;
                       	test_intermediate2[0]=0;
						test_intermediate2[1]=0;
						test_intermediate2[2]=0;
					

					  	for( k=0;k<3;k++)
						{
							for(l=0;l<scan;l++)
							{	 
									delay(10);
								   ADC_A=1;
								   ADC_B=0; // channel 1 is selected

									delay(200);
								

									ALE=0;
									SC=0;
									delay(1);

									 ALE=1;
									 delay(1);
									 SC=1;
									 delay(1);

									 ALE=0;
									 delay(1);
									 SC=0; 

									 delay(200);
																		 
									 test_intermediate1[l]=adc_input/scan;
								
								
							}


							for(i=0;i<scan;i++)
							test_intermediate2[k]+=test_intermediate1[i];
						}


						test_intermediate2[0]=test_intermediate2[0]/3;
						test_intermediate2[1]=test_intermediate2[1]/3;
						test_intermediate2[2]=test_intermediate2[2]/3;

						test_intermediate3=test_intermediate2[0] + test_intermediate2[1] + test_intermediate2[2];
					
						
						 Convert2();
						 	shape2();
			
						long_delay(1);
					  ADC_A=0;
					 ADC_B=1; // channel 2 is selected for	current

		//;;;;;;;;;;;;;;;;;  Current samples;;;;;;;;;;;;;;;;;;;;;;;;;

						    test_intermediate3=0;
							test_final=0;
						test_intermediate2[0]=0;
						test_intermediate2[1]=0;
						test_intermediate2[2]=0;
                  

					  	for( m=0;m<3;m++)
						{
							for( n=0;n<scan;n++)
							{	   
									delay(10);
								   ADC_A=0;
								   ADC_B=1; // channel 2 is selected

									delay(200);
								

									ALE=0;
									SC=0;
									delay(1);

									 ALE=1;
									 delay(1);
									 SC=1;
									 delay(1);

									 ALE=0;
									 delay(1);
									 SC=0;
								
									 delay(200);
									 									 
									 test_intermediate1[n]=adc_input/scan;

								
							}



							for(i=0;i<scan;i++)
							test_intermediate2[m]+=test_intermediate1[i];
						}


						test_intermediate2[0]=test_intermediate2[0]/3;
						test_intermediate2[1]=test_intermediate2[1]/3;
						test_intermediate2[2]=test_intermediate2[2]/3;

						test_intermediate3=test_intermediate2[0] + test_intermediate2[1] + test_intermediate2[2];
					
						 Convert3();
						 	shape3();
						long_delay(1);
						
				}
		   }

and here is my circuit diagram..

View attachment 62590

thanking you in anticipation.

regards
Qaisar azeemi.

 

[Ian Rogers]

I've done a simulation..... You can't just clock the clock pin on the ADC when you want data.. It needs a constant clock. If you place a digital clock source on the clock pin It works fine
(apart from the horrendous mapping)

 

[Qaisar Azeemi]

i cant understand fully...
you mean to say i should use a 555timer IC to get a continuous clock??? i think i am using a continuous clock as i am generating it using timer 0 interrupt... ?????

 

[Ian Rogers]

What speed is your OSC..... Maybe I had that wrong..... If I connect the clk to an external source the ADC works fine..... I was assuming 12mhz.

 

[Qaisar Azeemi]

OSC is 12MH crystal.

and i am providing ADC clock of 500khz from microcontroller.

 

[Ian Rogers]

I can check it out tomorrow... I have converted your code to SDCC and its at home, but I'm off to Liverpool tonight so I wont get a chance to see it.

 

[Qaisar Azeemi]

Thank you very much mr rogers. what is SDCC??

 

[Qaisar Azeemi]

my above problem is solved Mr Rogers.

it was due to the previously converted data added to the the new scan. i just write an extra() function to put 00000000 to the output port of ADC0808; and call extra on next channel scan; thus to erase the previously converted data and prevent it to be added to the data of next channel hence the co-channel logical interference is eleminated...


now i fall in to another Logical problem ... that the analog data for voltage on pin 27 channel 1 of ADC is not converted to its true value to be displayed at the output... please see the convert 2 function in my code. . . the conversion is not linear... updated code is tagged below......

#include <reg52.h>


 #define select P3
 #define Port P2  // control port
 #define adc_input P1
 #define data_port P0  // data from microcontroller to LCD
 #define sec 50
 #define scan 10

 sbit ADC_A=Port^0;	//ADC
 sbit ADC_B=Port^1;	//ADC
 sbit RS=Port^7;  		//LCD
 sbit E=Port^5;		   //LCD
 sbit ctl=Port^6;		  //LCD
 sbit SC=Port^4;   //ADC
 sbit CLK=Port^3;  //ADC
 sbit ALE=Port^2;  //ADC

 sbit v28=select^4; // carger 28v selected
 sbit v14=select^5;
 sbit v7=select^6;
 sbit off=select^7;
 sbit intr=select^2;
 sbit c28=select^0;
 sbit c14=select^1;
 sbit c7=select^3;
 
unsigned int test_intermediate3=0, test_final=0, select_mem=0, x=0;
unsigned int test_intermediate1[scan], test_intermediate2[3]={0,0,0};
unsigned char temp[]={"Temp:  "}, vna[]={" Volt:    Amp:  "},  hnm[]={"  hr   min     %"}, bnc[]={"Backup:  %Charge"};


		 //------------------- . --------------------------

		void delay(unsigned int msec)
		{
			int i,j;
			for(i=0; i==msec; i++)
				for(j=0; j==1275; j++);

		}

	//...........;;;;;;;;;;..........................	
		
		void long_delay(unsigned int second)
		{
		   int i,j;
		   for (j=0; j<second ; j++)
		  		 for (i=0; i<0xffff; i++);
		}

 


		//---------------- timer 0 interrupt----------------

		void timer0() interrupt 1
		{
		   		
					CLK=~CLK;		// Toggle port bit p3.5
					TR0=0;         // stop timer
					TH0=0xff;	    // 500hz clock for adc
					TL0=0xff;
					TR0=1;			// start timer
		}

	   	//;;;;;;;;;;;;;;;;;;;;;;;;;;;

		 void switch2(void)
 	{
  		if (v7==1 & v14==0 & v28==0)
			{
				c7=1; c14=0; c28=0;
			}

		else
		if(v14==1 & v7==0 & v28==0)
			{
				c14=1; c7=0; c28=0;
			}
		else
		if (v28==1 & v7==0 & v14==0)
			{
				c28=1; c14=0; c7=0;
			}						  	

	

	}
	  
	   //---------------- External 0 interrupt----------------

		void switching() interrupt 0
		   {
						 
				     intr=1;
					 delay(sec*4);
		   		   select = select_mem;
					  intr=1;
					   delay(sec*4);
						
		   	//	...............---------........................


					   	if(v28==0 & v14==0 & v7==0 & off==1)
				  				{ off=0; v7=1; v28=0; v14=0; }
					
				    else
                        if(v28==0 & v14==0 & v7==1 & off==0)		//e1
                                { v7=0; v14=1; v28=0; off=0; }
					
					else
						if(v28==0 & v14==1 & v7==0 & off==0)		 //e2
						        { v14=0; v28=1; v7=0;  off=0; }
					
					else
						if(v28==1 & v14==0 & v7==0 & off==0)		 //e3
					   			{ v28=0; v14=0; v7=0; off=1; }
															
															 
				
				delay(sec*4);  					 
				intr=1;
				c7=0; c14=0; c28=0;
				delay(sec*4);
			   	select_mem = select;	
			
			//	delay(1000);
				long_delay(10);
				 switch2(); 

  }

 


		//.................. LCD .................


		void lcd_cmd( unsigned int item )
		{
			data_port=item;  //command on data port p0 of lcd
			RS=0;            // selecting command register of lcd
		//	RW=0;
			E=1;
			delay(1);
			E=0;
		                       
		}




		void lcd_data( unsigned int item )
		{
			data_port=item;  //data on data port p0 of lcd
			RS=1;            // selecting data register of lcd
		//	RW=0;
			E=1;
			delay(1);
			E=0;
		
		}










	  //----------- custom character Generation for Degree symbol-----------

	  void shape()
	  {
	  		
			lcd_cmd(64); 		// first location in CGRAM
			delay(sec);
			lcd_data(2);
			delay(sec);
			lcd_data(5);
			delay(sec);
			lcd_data(2);
			delay(sec);
			lcd_data(0);
			delay(sec);
			lcd_data(0);
			delay(sec);
			lcd_data(0);
			delay(sec);
			lcd_data(0);
			delay(sec);
			lcd_data(0);
			delay(sec);

		
	  }


	  //-------------------- for volt symbol-----------------

	   void shape2()
	  {
	  		
			lcd_cmd(72); 		// second location in CGRAM
			delay(sec);
			lcd_data(0);
			delay(sec);
			lcd_data(0);
			delay(sec);
			lcd_data(17);
			delay(sec);
			lcd_data(17);
			delay(sec);
			lcd_data(17);
			delay(sec);
			lcd_data(10);
			delay(sec);
			lcd_data(4);
			delay(sec);
			lcd_data(0);
			delay(sec);

	
	  }

	 //---------------------- for current symbol-------------------

	  void shape3()
	  {
	  		
			lcd_cmd(80); 		// Third location in CGRAM
			delay(sec);
			lcd_data(0);
			delay(sec);
			lcd_data(0);
			delay(sec);
			lcd_data(4);
			delay(sec);
			lcd_data(10);
			delay(sec);
			lcd_data(17);
			delay(sec);
			lcd_data(31);
			delay(sec);
			lcd_data(17);
			delay(sec);
			lcd_data(0);
			delay(sec);

	
	  }
								





	  //..... Converting binary value of ADC to ASCII value of LCD for Temprature........




	  void convert()
	  {
	  		int s;
					 
			test_final=(((9*test_intermediate3)/5)+32);			 // Farenhite conversion
			
			s=test_final/100;
			test_final=test_final%100;

			lcd_cmd(0xc5);
			delay(sec);
			if (s!=0)
				{
				lcd_data(s+48);	//c5
				delay(sec);
				}
			else
				{
				lcd_cmd(0x06);
				delay(sec);
				}


		  s=test_final/10;
		  test_final=test_final%10;

		  lcd_data(s+48);	   //c6
		  delay(sec);
		  lcd_data(test_final+48);	//c7
		  delay(sec);
		  lcd_data(0);				 // space for degree symbol
		  delay(sec);
		  lcd_data('F');
		  delay(sec);
		  lcd_data(' ');
		  delay(sec);


		//------------------- for Celcius scale----------------

		  test_final=test_intermediate3;



		  s=test_final/100;
			test_final=test_final%100;

			lcd_cmd(0xcB);
			delay(sec);
			if (s!=0)
				{
				  lcd_data(s+48);	// 1st digit MS
					delay(sec);
				}
			else
				{
				  lcd_cmd(0x06);
					delay(sec);
				}



		  s=test_final/10;			 // 2nd digit
		  test_final=test_final%10;	 // 3rd digit LS

		  lcd_data(s+48);  //89
		  delay(sec);
		  lcd_data(test_final+48);	 //88
		  delay(sec);
		  lcd_data(0);		   // space for degree symbol
		  delay(sec);
		  lcd_data('C');
		  delay(sec);
		   lcd_data(' ');
		  delay(sec);
	
		 }







		 // Converting binary value of ADC to ASCII value of LCD for volts


		 void  Convert2()
		 {
		 	int s;
	 //.................... Voltage conversion ............................

					 
		 test_final=test_intermediate3/8;
			
			s=test_final/100;
			test_final=test_final%100;

			 lcd_cmd(0x85);
			delay(sec);
			if (s!=0)
				{
				lcd_data(s+48);
				delay(sec);
				}
			else
				{
				lcd_cmd(0x06);
				delay(sec);
				}


		  s=test_final/10;
		  test_final=test_final%10;

		  lcd_data(s+48);	   
		  delay(sec);
		  lcd_data(test_final+48);	   
		  delay(sec);
		  lcd_data(1);
		  delay(sec);
		 
		 }

		//-------------------..................-------------------

		 void  Convert3()
		 {
		 	int s;
	//.................... current conversion ............................

					 
		 test_final=test_intermediate3/2;
			
			s=test_final/100;
			test_final=test_final%100;

			  lcd_cmd(0x8D);
			delay(sec);
			if (s!=0)
				{
				lcd_data(s+48);
				delay(sec);
				}
			else
				{
				lcd_cmd(0x06);
				delay(sec);
				}


		  s=test_final/10;
		  test_final=test_final%10;

		  lcd_data(s+48);	   
		  delay(sec);
		  lcd_data(test_final+48);
		  delay(sec);
		  lcd_data(2);
		  delay(sec);
	
		 }

	  //,,,,,,,,,,,,,,,,,,,---cleanzing---,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

	  void extra()
	  {
		 int m,n,o;
	  					for( m=0;m<3;m++)
						{
							for( n=0;n<scan;n++)
							{	   
									delay(10);
								   ADC_A=1;
								   ADC_B=1; // channel 4 is selected

									delay(200);
								

									ALE=0;
									SC=0;
									delay(1);

									 ALE=1;
									 delay(1);
									 SC=1;
									 delay(1);

									 ALE=0;
									 delay(1);
									 SC=0;
								
									 delay(200);
									 									 
									 test_intermediate1[n]=adc_input/scan;

								
							}



							for(o=1;o<scan;o++)
							test_intermediate2[m]+=test_intermediate1[o];
						}


						test_intermediate2[0]=test_intermediate2[0]/3;
						test_intermediate2[1]=test_intermediate2[1]/3;
						test_intermediate2[2]=test_intermediate2[2]/3;

						test_intermediate3=test_intermediate2[0] + test_intermediate2[1] + test_intermediate2[2];
						test_final=0;
	  				
	  		 }
	  
	  
	  
	  
	  //.........--------.......Main Program.......-------........

		

		   void main()
		   {

		   		int i,j;
				adc_input=0xff; // making p1 as input port
				TMOD=0x01;	   // timer 0,  mode 1
				TH0=0xff;	    // 500hz clock for adc
				TL0=0xff;
				TR0=1;         // timer start

				IE=0x83;		// interrupt enable ; timer interrupt, external interrupt and globle interrupt.
				
			v28=0; v14=0; v7=0; off=1;  // intializing charger selection to 0V
			c28=0; c14=0; c7=0;
			intr=1;

			  select_mem = select;
			  delay(sec);
			   	   
		
				lcd_cmd(0x38);		// initializing LCD module
				delay(sec);

				lcd_cmd(0x0c);
				delay(sec);

				lcd_cmd(0x01);
				 delay(sec);

				lcd_cmd(0x06);
				delay(sec);

									  
				
	//;;;;;;;;;;;;;;-----------;;;;;;;;;;;;;;;
	//......... volt and ampere display........

	       lcd_cmd(0x80);																		    
		   	delay(sec);
		   	 													 
			for(i=0; vna[i]!='\0'; i++)
				{
					lcd_data(vna[i]);
					delay(sec);
				}
	   
	//;;;;;;;;;;;;-----------------------;;;;;;;;;;;;;;;;;
	//..........- Back up and %Charge display ----........

				lcd_cmd(0x90);
			    delay(sec);

			for(i=0; bnc[i]!='\0' ; i++)
				{
					lcd_data(bnc[i]);
					delay(sec);
				}							

									

		//;;;;;;;;;;;;;;-----------;;;;;;;;;;;;;;;
	    //......... ----Temp: display-----........

			lcd_cmd(0xc0);
		 	delay(sec);
		   
			for(i=0; temp[i]!='\0' ; i++)
				{
					lcd_data(temp[i]);
					delay(sec);
				}	


	//;;;;;;;;;;;;;;-------------------------;;;;;;;;;;;;;;;;;
	//.............- hour and minute display ------...........

		    lcd_cmd(0xD0);									   
		   	delay(sec);
		  	
			for(i=0; hnm[i]!='\0'; i++)
				{
					lcd_data(hnm[i]);
					delay(sec);
				}
									
//;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;



				while(1)
				{

				//;;;;;;;;;;;;;;;;;;;;;; Temprature samples ;;;;;;;;;;;;;;;;;;;;;;
					   //extra();
					   test_intermediate3=0;
							test_final=0;
						test_intermediate2[0]=0;
						test_intermediate2[1]=0;
						test_intermediate2[2]=0;
						ADC_A=0;
						ADC_B=0; // channel 0 is selected   ; pin 26 of ADC

					
						for(j=0;j<3;j++)
						{
							for(i=0;i<scan;i++)
							{	   ctl=0;
								   delay(10);
								   ADC_A=0;
								   ADC_B=0; // channel 0 is selected   ; pin 26 of ADC

									delay(200);
								
									ALE=0;
									SC=0;
									delay(1);

									 ALE=1;
									 delay(1);
									 SC=1;
									 delay(1);

									 ALE=0;
									 delay(1);
									 SC=0; 
									
									 delay(200);
																		 
									 test_intermediate1[i]=adc_input/scan;
								
								
							}


							for(i=1;i<scan;i++)
							test_intermediate2[j]+=test_intermediate1[i];
						}


						test_intermediate2[0]=test_intermediate2[0]/3;
						test_intermediate2[1]=test_intermediate2[1]/3;
						test_intermediate2[2]=test_intermediate2[2]/3;

						test_intermediate3=test_intermediate2[0] + test_intermediate2[1] + test_intermediate2[2];
					
					

						convert();
						shape();
					   
					   
		 //;;;;;;;;;;;;;;;;;  Voltage samples;;;;;;;;;;;;;;;;;;;;;;;;;
					   
					   extra();
					 delay(10000);

					 ADC_A=1;
					 ADC_B=0; // channel 1 is selected

		

			  		 test_intermediate3=0;
				  		 test_final=0;
                       	test_intermediate2[0]=0;
						test_intermediate2[1]=0;
						test_intermediate2[2]=0;
					

					  	for( j=0;j<3;j++)
						{
							for(i=0;i<scan;i++)
							{	 
								   delay(10);
								   ADC_A=1;
								   ADC_B=0; // channel 1 is selected

									delay(200);
								

									ALE=0;
									SC=0;
									delay(1);

									 ALE=1;
									 delay(1);
									 SC=1;
									 delay(1);

									 ALE=0;
									 delay(1);
									 SC=0; 

									 delay(200);
																		 
									 test_intermediate1[i]=adc_input/scan;
								
								
							}


							for(i=1;i<scan;i++)
							test_intermediate2[j]+=test_intermediate1[i];
						}


						test_intermediate2[0]=test_intermediate2[0]/3;
						test_intermediate2[1]=test_intermediate2[1]/3;
						test_intermediate2[2]=test_intermediate2[2]/3;

						test_intermediate3=test_intermediate2[0] + test_intermediate2[1] + test_intermediate2[2];
					
						
						 Convert2();
						 shape2();
						
	
	
		//;;;;;;;;;;;;;;;;;  Current samples;;;;;;;;;;;;;;;;;;;;;;;;;					
						
						
						 extra();
						 delay(10000);

					//	long_delay(1);
					
					  ADC_A=0;
					  ADC_B=1; // channel 2 is selected for	current	 

						test_intermediate3=0;
						test_final=0;
						test_intermediate2[0]=0;
						test_intermediate2[1]=0;
						test_intermediate2[2]=0;
                  

					  	for( j=0;j<3;j++)
						{
							for( i=0;i<scan;i++)
							{	   
									delay(10);
								   ADC_A=0;
								   ADC_B=1; // channel 2 is selected

									delay(200);
								

									ALE=0;
									SC=0;
									delay(1);

									 ALE=1;
									 delay(1);
									 SC=1;
									 delay(1);

									 ALE=0;
									 delay(1);
									 SC=0;
								
									 delay(200);
									 									 
									 test_intermediate1[i]=adc_input/scan;

								
							}



							for(i=1;i<scan;i++)
							test_intermediate2[j]+=test_intermediate1[i];
						}


						test_intermediate2[0]=test_intermediate2[0]/3;
						test_intermediate2[1]=test_intermediate2[1]/3;
						test_intermediate2[2]=test_intermediate2[2]/3;

						test_intermediate3=test_intermediate2[0] + test_intermediate2[1] + test_intermediate2[2];
					
						 Convert3();
						 	shape3();
							extra();
					//	long_delay(1);
						delay(10000);

				}
		   }

 

[Ian Rogers]

Thank you very much mr rogers. what is SDCC??

SDCC is a free C compiler for small devices.. I like it, even though its a little harder to learn.

I found out why the clock wasn't working.... Even if you set the count to 0xFFFF... It was counting once

Instead of 500khz it was only 34khz... So the timer cant be used

I worked out that we have a 14uS maximum we need 2uS.