Sometimes, you need to measure analog signal and then switch something on or off according to the result. This short example shows, how to do it. Everything you need is DDC-SE-01 module as a sensor module and DDC-RE-01 as relay module. Of course you need DK-EVAL-04 or CK-USB-04 for both of them as a master module.

This example originates from IQRF contest Example 12. It was simplified and changed for TR-52D module.

Relay module source code

// *********************************************************************
#include "includes/template-basic.h"
// *********************************************************************
#define RE1_TRIS    TRISC.5    // C8/SDO pin connected to the RE1
#define RE1_IO      PORTC.5

#define RE2_TRIS    TRISC.2    // C2/IO2 pin connected to the RE2
#define RE2_IO      PORTC.2

// *********************************************************************

void APPLICATION()
{
    RE1_IO = 0;
    RE1_TRIS = 0;    // Pin as output
    RE2_IO = 0;
    RE2_TRIS = 0;    // Pin as output
	
    pulseLEDG();    // Reset indication
    waitDelay(10);

    while (1)
    {
        clrwdt();
		
        if (RFRXpacket())
        {
		
            if (bufferRF[0] == 'S')		
            {
                switch (bufferRF[1])
                {
                    case '1':			
                    RE1_IO = 1;		
                    break;
						
                    case '2':			
                    RE1_IO = 0;		
                    break;	
					
                    case '3':			
                    RE2_IO = 1;		
                    break;
						
                    case '4':			
                    RE2_IO = 0;		
                    break;	
                }
            }
        }
    }
}

Source code is very simple. Relays are switched on or off acording to received char.

Sensor module source code

// *********************************************************************
#include "includes/template-basic.h"
// *********************************************************************
#define TRESHOLD_PTM    15    // Means 1.5V from full range 0 - 3.0 V
// *********************************************************************

void InitADC(void);
void ReadAnalogInput(void);

// *********************************************************************
uns16 ADC_result, voltage;
// *********************************************************************

void APPLICATION()                  
{
    TRISA.5 = 1;    // Potentiometer pins C5 (AN4) as input 
    TRISC.6 = 1;
    TRISB.4 = 1;
    TRISA.0 = 1;	
    InitADC();
    pulseLEDG();	
    waitDelay(10);
	
    while(1)
    {	
        //clrwdt();
        waitDelay(5);    // Read AN input every 50 ms
        ReadAnalogInput();		
        voltage = ADC_result * 30;	
        voltage /= 1024;
			
        bufferRF[0] = 'S';
        if(voltage > TRESHOLD_PTM)
            bufferRF[1] = '1';
        else
            bufferRF[1] = '2';
			
        PIN  = 0;
        DLEN = 2;
        RFTXpacket(); 
    }	
}
// *********************************************************************

void InitADC(void)    // ADC init (for more info see PIC datasheet)
{
    ANSELA.5 = 1;            // pin C5 (AN4) as analog input 
    ADCON0  = 0b00010001;    // ADC setting (AN4 channel)
    ADCON1  = 0b10010000;    // ADC result - right justified, Fosc/8
}
//----------------------------------------------------------------------

void ReadAnalogInput(void)
{
    GO = 1;        // start ADC
    while(GO);     // wait for ADC finish
	
    ADC_result.high8 = ADRESH & 0x03;    // 10b result is stored
    ADC_result.low8  = ADRESL;    // in ADRESH and ADRESL
}
//----------------------------------------------------------------------

Analog input C5 (AN4) is readed every 50ms. Resolution is 0.1V. So if you want get full scale value, you have to multiply ADC result by 30.

Tested on TR-52D, OS version 3.03.

Enjoy.