This is simple illustration how to build easy PWM LED control with IQRF TR module and a few other components.

This device is powered from 12V/6A DC power supply and can power up to 5m of LED strip. This device can be controlled via RF, buttons or potentiometer. RF controling is compatible with remote control device RC-04 wih low battery signalizing – fast 3 time LED blinking.

It’s recomended to connect potentiometer via short shield cable.

Schematics:

Code example:

// *********************************************************************
// *                            PWM-LED_B                              *
// *                              v1.01                                *
// *                            DPS v1.02                              *
// *********************************************************************
/*
 press SW2 and SW1 to save actual PWM value from potentiometer to
 EEPROM and next start with SW1 to setting PWM value
 
 User define time to automatic off LEDs - TimeToOff, comment to disable
*/
 // *********************************************************************

#include "../includes/template-basic.h" // System header files

// *********************************************************************
#define TR52D

#define ADC_filter    10       // potentiometer sensitivity - 1-15
                               // 1 ... maximal sensitivity
#define TimeToOff     14400    // 4h define automatic-off time in 
                               // seconds 1 - 65536									
                               // comment to disable
#define SW1    _C6_IN          // button S1 - on
#define SW2    _C7_IN          // button S2 - off
#define PWM    PORTC.6         // PWM output on pin C5
// *********************************************************************
interrupt userIntRoutine(void); 
// *********************************************************************
void InitHW(void);
void RFControl(void);
void Battery(void);
void ADControl(void);
void ButtonControl(void);
void InitPWM(void);
uns8 ReadADC(void);	
void setPWM(uns8 hodnota);
void TimeControl(void);    // auto turn off after user defined time
// *********************************************************************
uns8    i;				
uns8    ADC_value;    // old value of potentiometer
bit     ADC_enable;		
bit     ADC_control;  // 1 ... control via ADC
                      // 0 ... control via other - RF, button
uns8    ADC_actual;   // actual value of potentiometer				
uns8    PWM_value;
uns8    PWM_save;     // saved PWM value to eePROM on position 0
bit     batteryError; // 0 ... battery OK
                      // 1 ... battery error					
uns8    time;         // time counter
uns16   timerOff;	 
bit     TimeControlEnable;
// *********************************************************************
void APPLICATION()                     
{
    InitHW();    // initialization hardware
    InitPWM();   // Initialization PWM output

    pulseLEDG();	
    waitDelay(10);				
	
    ADC_value = ReadADC();    // read position of potentiometer
	
    while (!SW1 && !SW2);    // after reset
    waitDelay(25);	
	
    while(1)
    {
        clrwdt();	
				
        if(checkRF(5)) RFControl();   // control via RF	
        Battery();                    // signalizing battery error	
        ADControl();                  // control via potentiometer
        ButtonControl();              // control via button
		
        // TR-52DA LED control:
        if (CCPR3L == PWM_value && CCPR3L != 0)
            _LEDG = 1;	
        else
            _LEDG = 0;
    }
}

Links:

• Remote controller RC-04
• Modul TR-52D