PIC16F887 dual ADC reading example MikroC

In previous post, we show how to program ADC in MikroC. It was a single channel reading. We can read any channel as need by setting a number of ADC input, and selecting a specific channel before reading.

Simulation sample of this program

In this example, program is written to read one of two ADC channels. An additional digital switch used for selecting one of these two channel. Its ten-bit ADC result will display on PORTD and PORTC.

MikroC program:

#define SW PORTA.RA7
 
void PORT_Init() {
     PORTA=0x00;        // Clear PORTA
     PORTC=0x00;        // Clear PORTC
     PORTD=0x00;        // Clear PORTD
     PORTB=0x00;        // Clear PORTB
     PORTA=0x83;        // RA0-RA1-RA7 are INPUT
     ANSEL=0x03;        // RA0 IS ANALOG
     TRISC=0x00;        // PORTC AS OUTPUT
     TRISD=0x00;        // PORTD AS OUTPUT
     }
 
void Analog_Init() {
     ADCON0=0x80;       // Select Fosc/32 AND AN0
     ADCON1=0x80;       // Select Right Justified and VDD-VSS
     ADCON0.ADON=1;     // Enable ADC Module
     }
 
 
void Read_ADC() {
     delay_ms(10);
     if(SW==1)  ADCON0|=0x04;      // select AN1
     else       ADCON0&=0x83;      // select AN0
     ADCON0.GO=1;                  // start of conversion
     while(ADCON0.GO);             // waiting for Conversion's Complete
     PORTC=ADRESL;
     PORTD=ADRESH;
     }
 
void main() {
     PORT_Init();
     OSCCON|=0x70;     // Select Internal 8MHz OSC
     Analog_Init();
     while(1)   Read_ADC();
}

Click here to download this example.

Schematic diagram:

Schematic diagram

PIC16F887 operates at 8MHz from its internal oscillator.