Tech News World, Contacts Samsung Galaxy, Windows 8, Nokia Lumia, Quad Core Smart Phones, HTC smartphone, Google Nexus, MacBook, PayPal

Monday, September 24, 2012

ANALOG TO DIGITAL CONVERTION using PIC16F877A and MPLABX

ANALOG TO DIGITAL CONVERTION using PIC16F877A and MPLABX - Although I work in the office and a lot of work that makes me tired but still I make a blog Tech News World and still will update it for you because this is part of my hobby who likes the world of technology, especially about the gadget, now we will discuss first about ANALOG TO DIGITAL CONVERTION using PIC16F877A and MPLABX because it is the topic that you are now looking for, please refer to the information I provide in the guarantee for you,

Articles : ANALOG TO DIGITAL CONVERTION using PIC16F877A and MPLABX
full Link : ANALOG TO DIGITAL CONVERTION using PIC16F877A and MPLABX

You can also see our article on:


ANALOG TO DIGITAL CONVERTION using PIC16F877A and MPLABX


Many electrical signals around us are Analog in nature. That means a quantity varies directly with some other quantity. The first quantity is mostly voltage while that second quantity can be anything like temperature, pressure, light, force or acceleration.

The PIC16F877A has a built-in Analogue to Digital converter. What ADC does is basically convert an analogue voltage ranging from -Vref to +Vref (usually 0V to 5V) and converts it to a binary value. The ADC on the PIC16F877A has 10-bit resolution and this provides 1024 steps (2^10=1024) which is more than enough for normal applications.



Programming ADC in HI-TECH C for MPLAB

ADC is connect to the PIC CPU by 3 control register and 2 data register. The control registers are used to setup and give commands to the ADC. They also provides the status of ADC. The two data registers holds the 10 bit of converted data. Since each resister in PIC18 is of 8 bits therefore 2 registers are required to hold the 10bit data.
We will develop two functions to support ADC in our projects. One will help initialize the module and other will help us select any of the 13 channels and start the conversion. After the conversion is done it will return us the results.
I am not giving here the description of the control and data registers as they are very clearly explained in PIC18F4520's datasheet on page 223 to 225. I request you to download the datasheet and read the description so that you will have an Idea of what every bit in the registers do. As I told before, ADC is connected to the CPU via three control register and two data registers. The three control registers are :-
  • ADCON0 - Used to select analog input channel,start the conversion, check if the conversion is done and to switch on/off the module.(We use this in ADCRead() function.)

  • ADCON1 - Used to Select Voltage reference, and to configure ports as Analog of digital. (We leave these to defaults)

  • ADCON2 - Used to select ADC data format, Set acquisition time, ADC clock setup (We setup these in ADCInit() function)

First we configure the ADC to our needs in the ADCInit() function.
//Function to Initialise the ADC Module
void ADCInit()
{
//We use default value for +/- Vref

//VCFG0=0,VCFG1=0
//That means +Vref = Vdd (5v) and -Vref=GEN

//Port Configuration
//We also use default value here too
//All ANx channels are Analog

/*
ADCON2

*ADC Result Right Justified.
*Acquisition Time = 2TAD
*Conversion Clock = 32 Tosc
*/

ADCON2=0b10001010;
}



ADCRead function ...


//Function to Read given ADC channel (0-13)
unsigned int ADCRead(unsigned char ch)
{
if(ch>13) return 0; //Invalid Channel

ADCON0=0x00;

ADCON0=(ch<<2); //Select ADC Channel

ADON=1; //switch on the adc module

GODONE=1; //Start conversion

while(GODONE); //wait for the conversion to finish

ADON=0; //switch off adc

return ADRES;
}




THE PROGRAM IS AVAILABLE ON GITHUB : https://github.com/ebine/



so much information about ANALOG TO DIGITAL CONVERTION using PIC16F877A and MPLABX

hopefully information ANALOG TO DIGITAL CONVERTION using PIC16F877A and MPLABX can provide useful knowledge for you in getting information about the latest gadgets,

just finished your reading article about ANALOG TO DIGITAL CONVERTION using PIC16F877A and MPLABX if you feel this article useful for you please bookmark or share using link http://aziin5teens.blogspot.com/2012/09/analog-to-digital-convertion-using.html for more people know

Tag :
Share on Facebook
Share on Twitter
Share on Google+
Tags :

Related : ANALOG TO DIGITAL CONVERTION using PIC16F877A and MPLABX

0 comments:

Post a Comment