#include"lcd.h" #include "adc.h" #include "delay.h" double volt_read_disply(); int main(void) { int adc_value1=0; LCD_SetUp(PB_0,PB_1,PB_2,P_NC,P_NC,P_NC,P_NC,PB_4,PB_5,PB_6,PB_7); LCD_Init(2,16); adc_init(); LCD_Clear(); LCD_GoToXY(0,0); LCD_DisplayString(" g-Electron"); _delay_ms(1000); while(1) { adc_value1 = volt_read_disply(); LCD_GoToLine(1); LCD_DisplayString(" Volt : "); LCD_DisplayNumber(10,adc_value1,3); LCD_DisplayString("V"); _delay_ms(1300); } } double volt_read_disply() { int i,adc_value[40]={0}; int temp =0; adc_init(); for(i=0; i<40;i++) // samples taking from 41 times 9.4milli second taken about on complte half cycle { adc_value[i] = read_adc(0); // reading voltage } temp = adc_value[0]; for(i=0; i<40; i++) { if(temp<adc_value[i]) temp=adc_value[i]; } return ((double)temp*0.224828935); // int to double casting }
Design of Digital Voltmeter By using Micro-controller Part 2
By
Transformer Configuration in Proteus
By
Setting up A Transformer in Proteus
The calculation Formula is L1/L2 = (V1/V2)^2
For Example: Design for 6 Volt input ,230volt 50Hz Not considered wattage just for simulation.
Assign L1 = 1H (but 1henry expectable for a 10 or 20 kW transformer)
Then L2 = 1/(230/6)^2
= 680.5293micro Henry
Transformer Configuration in Proteus
By
Setting up A Transformer in Proteus
The calculation Formula is L1/L2 = (V1/V2)^2
For Example: Design for 6 Volt input ,230volt 50Hz Not considered wattage just for simulation.
Assign L1 = 1H (but 1henry expectable for a 10 or 20 kW transformer)
Then L2 = 1/(230/6)^2
= 680.5293micro Henry
Design of Digital Voltmeter By using Microcontroller
By
Tutorial for Atmeag8 /AVR based Voltmeter
It measures the Ac voltage and shows readings in RMS value.
Basics Of AC signal
The AC signal ,its amplitude varying in accordance with time. In india AC frequency is 50Hz.
Then the Time period one full cycle ,
T = 1/frequency
T = 1/50Hz = .002second
= 20milli Second
= 10 Milli second for Half Cycle
There are a lot of methods for measuring AC volt digitally
we could find the RMS value by multipliying the Peak Voltage with 0.707.
Vrms = Peak Voltage * 0.707 .
Approximatly Indian Line AC Peak volatge is 325v.
Example :
325v *0.707 = 229.775Volt .(appro = 230Vrms).
But Microcontroller could only sense up to 5 volt as well as it couldnt sense negative values
so we cannot give 230 volt directly to It .
It can be rectify by using a Stepdown transformer ,which has an advantage of safety.
Ac voltage can be reduce by using transformer to comfortable range . (ie 0 to 5volt DC)
make the calculation as ,
The voltage Divider would give a 5 volt when the Vrms 230v. [will be more give details on the way ].
The full wave rectifier output will give to ADC of micro controller . Then do corresponding coding.
Microcontroller Section we need to mesure only one half cycles repeatedly because the waves same are repeating Basics
I selected , the F_cpu frequency is the internal RC Oscillator 8MHz.Atmega8 ADC uses Prescalar [frequency reducer or divider by 2th,4th etc]Atmega ADC Prescale Frequency is in between 50Khz to 200KzADC conversion time is in between 13 to 260 micro second.
ADC frequency = F_cpu / Prescaler
= 800,000HZ / 8 = 62.5KHz
At high frequency ADC conversion would be fast while at lower frequency the conversion will be more accuracy.
ADC conversion time Calculation
Conversion Time = 1/ADC frequency
= 1/62500 = 0.000016 Second = 0.016 Milli Second = 16 Micro Second. [At 62.500KHz]
So 16 mirco second would taken for one cycle of conversion.with 62,5KHz.
13 ADC cycles required for one conversion
ie, 13 * 16Micro Second = 230 Micro Second [approximately] = 230us.
The Half wave has 10milli second time duration.[100000microsecond].
There the available conversion times is
= Total time period for a half cycle /one ADC conversion time = 10000 micro second / 230 micro second = 43.4 samples [ for one half cycleie 10 milli second]
Image Shows only 7 Samples per half cycles .in our case it is 43
And again reduced the sampling to 40 .
calculation of Vpeak
Takes the largest Vpeak from the 40 samples.
Vrms = Vpeak * .707
*****************************************************************************
Atmega8 ADC StepSize Calculation
Atmega8 uses successive approximation adc ,
The Atmega8 ADC is a 10 Bit /[ie the Maximum high value is 1023 =1111111111] at which the ADC will give fullscale Value .
The ADC require a clock as well as a reference voltage .
The resolution of ADC output decide the Step size.
ADC o/p = Vin * 1024 / Vref
Examples;
Vin =5volt , Vref =5volt
ADC o/p = 5 * 1023 /5 = 1023 [ADC highest Value]
Step Size voltage = Vref / 1023 = 0.004887 volt =4.88millivolt
One binary digit changes when 4.88volt changes takes place
Image's Step Size is 1.25 volt
*******************************************************************************************************
Design of Digital Voltmeter By using Microcontroller
By
Tutorial for Atmeag8 /AVR based Voltmeter
It measures the Ac voltage and shows readings in RMS value.
Basics Of AC signal
The AC signal ,its amplitude varying in accordance with time. In india AC frequency is 50Hz.
Then the Time period one full cycle ,
T = 1/frequency
T = 1/50Hz = .002second
= 20milli Second
= 10 Milli second for Half Cycle
There are a lot of methods for measuring AC volt digitally
we could find the RMS value by multipliying the Peak Voltage with 0.707.
Vrms = Peak Voltage * 0.707 .
Approximatly Indian Line AC Peak volatge is 325v.
Example :
325v *0.707 = 229.775Volt .(appro = 230Vrms).
But Microcontroller could only sense up to 5 volt as well as it couldnt sense negative values
so we cannot give 230 volt directly to It .
It can be rectify by using a Stepdown transformer ,which has an advantage of safety.
Ac voltage can be reduce by using transformer to comfortable range . (ie 0 to 5volt DC)
make the calculation as ,
The voltage Divider would give a 5 volt when the Vrms 230v. [will be more give details on the way ].
The full wave rectifier output will give to ADC of micro controller . Then do corresponding coding.
Microcontroller Section
we need to mesure only one half cycles repeatedly because the waves same are repeating
Basics
I selected , the F_cpu frequency is the internal RC Oscillator 8MHz.
Atmega8 ADC uses Prescalar [frequency reducer or divider by 2th,4th etc]
Atmega ADC Prescale Frequency is in between 50Khz to 200Kz
ADC conversion time is in between 13 to 260 micro second.
ADC frequency = F_cpu / Prescaler
= 800,000HZ / 8
= 62.5KHz
At high frequency ADC conversion would be fast while at lower frequency the conversion will be more accuracy.
ADC conversion time Calculation
Conversion Time = 1/ADC frequency
= 1/62500
= 0.000016 Second
= 0.016 Milli Second
= 16 Micro Second. [At 62.500KHz]
So 16 mirco second would taken for one cycle of conversion.with 62,5KHz.
13 ADC cycles required for one conversion
ie,
13 * 16Micro Second = 230 Micro Second [approximately]
= 230us.
The Half wave has 10milli second time duration.[100000microsecond].
There the available conversion times is
= Total time period for a half cycle /one ADC conversion time
= 10000 micro second / 230 micro second
= 43.4 samples [ for one half cycleie 10 milli second]
Image Shows only 7 Samples per half cycles .in our case it is 43
And again reduced the sampling to 40 .
calculation of Vpeak
Takes the largest Vpeak from the 40 samples.
Vrms = Vpeak * .707
*****************************************************************************
Atmega8 ADC StepSize Calculation
Atmega8 uses successive approximation adc ,
The Atmega8 ADC is a 10 Bit /[ie the Maximum high value is 1023 =1111111111] at which the ADC will give fullscale Value .
The ADC require a clock as well as a reference voltage .
The resolution of ADC output decide the Step size.
ADC o/p = Vin * 1024 / Vref
Examples;
Vin =5volt , Vref =5volt
ADC o/p = 5 * 1023 /5 = 1023 [ADC highest Value]
Step Size voltage = Vref / 1023 = 0.004887 volt =4.88millivolt
One binary digit changes when 4.88volt changes takes place
Image's Step Size is 1.25 volt
*******************************************************************************************************
Atmega-based-Menu-building-lcd-16x2
By
A menu system Applicable for various microcntroller projects ,Not fully completed only for learning the full code and proteus are available below to download for learning purpose thanking you
/*
* push_button__lcdMenu.c
*
* Created: 7/30/2017 11:48:27 AM
* Author: Krishna
*/
#include
#include "lcd.h"
#include "delay.h"
#include "button_key.h"
# define F_CPU 1000000UL
struct menu s1= {0}; //s1.menu_up-key =1;
int main(void)
{ int a;
struct menu s1= {0}; //s1.menu_up-key =1;
const char *menu_display[10];
menu_display[0] = " Select Menu";
menu_display[1] = " Set Time";
menu_display[2] = " Set Date";
menu_display[3] = " Set Alaram";
menu_display[4] = " Set Alaram ";
//sub menu
menu_display[5] = " Enter Time ";
menu_display[6] = " Enter Date ";
menu_display[7] = " Enter Alarm ";
menu_display[8] = " Enter Alarm";
LCD_SetUp(PB_0,PB_1,PB_2,P_NC,P_NC,P_NC,P_NC,PB_4,PB_5,PB_6,PB_7);
LCD_Init(2,16);
LCD_GoToLine(0);
DELAY_ms(100);
//LCD_Clear();
while(1)
{
// key_display( key_value);
menu_key_display (s1,menu_display);
LCD_Clear();
for(a=0; a<5 a="" d="" lcd_printf="" pre="" s1.time="">
5>
/*https://youtu.be/bNwrHuY4Kxk
* button_key.c
*
* Created: 7/30/2017 12:02:39 PM
* Author: Krishna
*/ #include
#include "delay.h"
#include "button_key.h"
#include "lcd.h"
void menu_key_display(struct menu s1,const char *menu_display[]);
void UP_Down_Keyvalue(struct menu s1,int i,int j);
/* Function Key Value For get key */
int Key_pressed(void)
{
while(1){
if (LEFT_S) { while(LEFT_S);return 1; }
if (RIGHT_S){ while(RIGHT_S);return 2; }
if (UP_S) { while(UP_S); return 3; }
if (DOWN_S) { while(DOWN_S);return 4 ; }
if (OK_S) { while(OK_S);return 5 ; }
}
}
/* Function Key Value For Up Key & Enter*/
void menu_key_display(struct menu s1,const char *menu_display[])
{
int ch;
int a;
int menu_position =0;
LCD_DisplayString(menu_display[menu_position]);
do{
repat:
ch = Key_pressed();
if(ch==1||ch==2)
{
if(ch==2)
{ if(ch==2)
{ if(s1.menu_side_key==4)
s1.menu_side_key = 0;
LCD_Clear();
LCD_GoToLine(0);
LCD_DisplayString(*((++s1.menu_side_key)+menu_display));
menu_position=1;
}
}
else if(ch==1)
{
if(ch==1)
{if(s1.menu_side_key==1 ||s1.menu_side_key==0)
{
s1.menu_side_key=5;
}
LCD_Clear();
LCD_DisplayString(*((--s1.menu_side_key)+menu_display));
menu_position=1;
}
}
}
if(menu_position==0)
goto repat;
}while(ch!=5);
a = s1.menu_side_key;
switch(a)
{
case 1: // set time
{
LCD_Clear();
LCD_GoToLine(0);
LCD_DisplayString(menu_display[5]);
LCD_GoToLine(1);
LCD_DisplayString(" HH:MM:SS:PM/AM");
UP_Down_Keyvalue(s1,2,4);
break;
}
case 2: // Set date
{
LCD_Clear();
LCD_GoToLine(0);
LCD_DisplayString(menu_display[6]);
LCD_GoToLine(1);
LCD_DisplayString(" DD:MM:YY");
UP_Down_Keyvalue(s1,2,3);
break;
}
case 3: // set alarm
{
LCD_Clear();
LCD_GoToLine(0);
LCD_DisplayString(menu_display[7]);
LCD_GoToLine(1);
LCD_DisplayString(" HH:MM:SS:AM/PM");
UP_Down_Keyvalue(s1,2,4);
break;
}
case 4: // set alarm
{
LCD_Clear();
LCD_GoToLine(0);
LCD_DisplayString(menu_display[8]);
LCD_GoToLine(1);
LCD_DisplayString(" HH:MM:SS:PM/AM");
UP_Down_Keyvalue(s1,2,4);
break;
}
}
while(Key_pressed()!=5);
}
/* Function Key Value For UP_Down Key */
void UP_Down_Keyvalue(struct menu s1,int i,int j)
{
int ch,lower,upper;
do{
if(j==4)
{
if(i==2)upper=1;
if(i==3)upper=9;
if(i==5)upper=5;
if(i==8)upper =5;
if(i==9)upper =9;
}
if(UP_S)
{
while(UP_S);
if(s1.menu_up_key==upper)
s1.menu_up_key = lower-1;
LCD_GoToXY(1,i);
LCD_Printf("%d",++s1.menu_up_key);
s1.time[i-2]=s1.menu_up_key;
}
else if(DOWN_S) // down
{ while(DOWN_S);
if (s1.menu_up_key==lower)
s1.menu_up_key = upper+1;
LCD_GoToXY(1,i);
LCD_Printf("%d",--s1.menu_up_key);
s1.time[i-2]=s1.menu_up_key;
}
if(RIGHT_S)
{ while(RIGHT_S);
s1.menu_up_key=0;
if(i==9) goto exit1;
if(i==3||i==6)
++i;
i++;
}
exit1:
if (LEFT_S)
{ while(LEFT_S);
s1.menu_up_key=0;
if(i==2) goto exit2;
if(i==5||i==8)
--i;
i--;
}
exit2:continue;
} while (ch!=5); // if Okay key exit loop
}
Atmega-based-Menu-building-lcd-16x2
By
A menu system Applicable for various microcntroller projects ,Not fully completed only for learning the full code and proteus are available below to download for learning purpose thanking you
/* * push_button__lcdMenu.c * * Created: 7/30/2017 11:48:27 AM * Author: Krishna */ #include#include "lcd.h" #include "delay.h" #include "button_key.h" # define F_CPU 1000000UL struct menu s1= {0}; //s1.menu_up-key =1; int main(void) { int a; struct menu s1= {0}; //s1.menu_up-key =1; const char *menu_display[10]; menu_display[0] = " Select Menu"; menu_display[1] = " Set Time"; menu_display[2] = " Set Date"; menu_display[3] = " Set Alaram"; menu_display[4] = " Set Alaram "; //sub menu menu_display[5] = " Enter Time "; menu_display[6] = " Enter Date "; menu_display[7] = " Enter Alarm "; menu_display[8] = " Enter Alarm"; LCD_SetUp(PB_0,PB_1,PB_2,P_NC,P_NC,P_NC,P_NC,PB_4,PB_5,PB_6,PB_7); LCD_Init(2,16); LCD_GoToLine(0); DELAY_ms(100); //LCD_Clear(); while(1) { // key_display( key_value); menu_key_display (s1,menu_display); LCD_Clear(); for(a=0; a<5 a="" d="" lcd_printf="" pre="" s1.time=""> 5>
/* * button_key.c * * Created: 7/30/2017 12:02:39 PM * Author: Krishna */ #include#include "delay.h" #include "button_key.h" #include "lcd.h" void menu_key_display(struct menu s1,const char *menu_display[]); void UP_Down_Keyvalue(struct menu s1,int i,int j); /* Function Key Value For get key */ int Key_pressed(void) { while(1){ if (LEFT_S) { while(LEFT_S);return 1; } if (RIGHT_S){ while(RIGHT_S);return 2; } if (UP_S) { while(UP_S); return 3; } if (DOWN_S) { while(DOWN_S);return 4 ; } if (OK_S) { while(OK_S);return 5 ; } } } /* Function Key Value For Up Key & Enter*/ void menu_key_display(struct menu s1,const char *menu_display[]) { int ch; int a; int menu_position =0; LCD_DisplayString(menu_display[menu_position]); do{ repat: ch = Key_pressed(); if(ch==1||ch==2) { if(ch==2) { if(ch==2) { if(s1.menu_side_key==4) s1.menu_side_key = 0; LCD_Clear(); LCD_GoToLine(0); LCD_DisplayString(*((++s1.menu_side_key)+menu_display)); menu_position=1; } } else if(ch==1) { if(ch==1) {if(s1.menu_side_key==1 ||s1.menu_side_key==0) { s1.menu_side_key=5; } LCD_Clear(); LCD_DisplayString(*((--s1.menu_side_key)+menu_display)); menu_position=1; } } } if(menu_position==0) goto repat; }while(ch!=5); a = s1.menu_side_key; switch(a) { case 1: // set time { LCD_Clear(); LCD_GoToLine(0); LCD_DisplayString(menu_display[5]); LCD_GoToLine(1); LCD_DisplayString(" HH:MM:SS:PM/AM"); UP_Down_Keyvalue(s1,2,4); break; } case 2: // Set date { LCD_Clear(); LCD_GoToLine(0); LCD_DisplayString(menu_display[6]); LCD_GoToLine(1); LCD_DisplayString(" DD:MM:YY"); UP_Down_Keyvalue(s1,2,3); break; } case 3: // set alarm { LCD_Clear(); LCD_GoToLine(0); LCD_DisplayString(menu_display[7]); LCD_GoToLine(1); LCD_DisplayString(" HH:MM:SS:AM/PM"); UP_Down_Keyvalue(s1,2,4); break; } case 4: // set alarm { LCD_Clear(); LCD_GoToLine(0); LCD_DisplayString(menu_display[8]); LCD_GoToLine(1); LCD_DisplayString(" HH:MM:SS:PM/AM"); UP_Down_Keyvalue(s1,2,4); break; } } while(Key_pressed()!=5); } /* Function Key Value For UP_Down Key */ void UP_Down_Keyvalue(struct menu s1,int i,int j) { int ch,lower,upper; do{ if(j==4) { if(i==2)upper=1; if(i==3)upper=9; if(i==5)upper=5; if(i==8)upper =5; if(i==9)upper =9; } if(UP_S) { while(UP_S); if(s1.menu_up_key==upper) s1.menu_up_key = lower-1; LCD_GoToXY(1,i); LCD_Printf("%d",++s1.menu_up_key); s1.time[i-2]=s1.menu_up_key; } else if(DOWN_S) // down { while(DOWN_S); if (s1.menu_up_key==lower) s1.menu_up_key = upper+1; LCD_GoToXY(1,i); LCD_Printf("%d",--s1.menu_up_key); s1.time[i-2]=s1.menu_up_key; } if(RIGHT_S) { while(RIGHT_S); s1.menu_up_key=0; if(i==9) goto exit1; if(i==3||i==6) ++i; i++; } exit1: if (LEFT_S) { while(LEFT_S); s1.menu_up_key=0; if(i==2) goto exit2; if(i==5||i==8) --i; i--; } exit2:continue; } while (ch!=5); // if Okay key exit loop }
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Speed – Distance – Time Calculator
Standard Resistor Closest Value
Step Motor Basics
Subwoofer Box Enclosure Tuning Frequency Calculators
Subwoofer Vent Length Calculators
Subwoofer Vent Minimum Port Diameter Calculators
Tee Attenuator Calculator
Thermodynamic Basics
Trace Width Calculator
Velocity of Sound Calculator
Vented Ported Subwoofer Box Calculators
Voltage Current Resistance Power Calculator
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Voltage Drop Calculator
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Electronics -Notes
By
Good electronics Book Notes Tutorials
- Power Electronics Notes by ArunKumar
- ECE-VII-OPTICAL FIBER COMMUNICATION [10EC72]
- ECE-VII-EMBEDDED SYSTEM DESIGN 10EC74 -NOTES_1450341942484_1450360316731
- ECE-VII-DSP ALGORITHMS ARCHITECTURE 10EC751 -NOTES
- ece-vi-satellite-communications-10ec662-notes
- ECE-VI-OPERATING SYSTEMS 10EC65 -NOTES
- ece-vi-antennas-and-propagation-10ec64-notes
- ECE-VI-ANTENNAS AND PROPAGATION 10EC64 -NOTES
- EC2353 notesDigital Communication
- Antennas and Radiowave Propagation -Collin
- Prentice.The.Intel.Microprocessors.8th.Edition.0135026458
- advanced_communication_lab-1
- microprocessor-8086-lab-mannual
- CSE-IV-MICROPROCESSORS 10CS45 -NOTES(2)
- ORGANISING & STAFFING
- MANAGEMENT & ENTREPRENEURSHIP
- AN INTRODUCTION TO RADAR
- MANAGEMENT & ENTREPRENEURSHIP
- Microwave Devices and Circuits (samuel Liao)
- editable_Digital_Signal_Processing_Principles_Algorithms_and_Applications_T
- ECE-V-INFORMATION THEORY & CODING [10EC55]-NOTES
- ece-v-fundamentals-of-cmos-vlsi-10ec56-notes
- Communication-Systems—4ed—Haykin
- Signals_And_Systems__Schaum_
- CMOS-VLSI-designSignals and Systems 2Ed – Haykin – Solutions Manual
- Fourier Representation for four Signal Classes
- Fourier Representation for four Signal Classes (2)
- ECE-IV-SIGNALS & SYSTEMS [10EC44]-NOTES (2)
- Analog Communication-Prabhakar Kapula
- Microcontroller (www.citystudentsgroup.blogspot.com)
- Analog Communication (www.citystudentsgroup.blogspot.com)
- LInear Integrated Circuits Notes Arunkumar PDF apKART.COM
- EEE-III-NETWORK ANALYSIS [10ES34]-NOTES(1)
- ECE-IV-LINEAR ICS & APPLICATIONS [10EC46]-NOTES
- EEE-III-ANALOG ELECTRONIC CKTS [10ES32]-NOTES
- amplifiers-module-05
- VHDL
- STATE GRAPHS FOR CONTROL NETWORKS
- PROGRAMMABLE ARRAY LOGIC
- PROGRAMMABLE LOGIC DEVICES-2
- ECE-IV-CONTROL SYSTEMS [10ES43]-NOTES
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