You can directly connect the output of HM2007 module to input pins of pic microcontroller. Don’t forget to configure those pins as input by writing to TRIS register. It will be easy to program if you use same port for all those input pins. Then you can easily change the output of L293D for each inputs as per your requirements.

There is no track/pad provided in the pcb for that resistor. That pcb is designed for mosfet. You need to adjust it in the circuit.

Please post these doubts in the comments section just below the article.

You can do the program by combining details in these two tutorials : Interfacing DC Motor with PIC Microcontroller and DC Motor Speed Control using PIC Microcontroller PWM. You need to calibrate the value of duty cycle with RPM, there is no other way.

Sorry, I don’t understand your code. You have 3 infinite loops in your program. One in main loop, one in 1 min delay loop and other in 2 min delay loop.

You can try like this :

void main()
{
  unsigned int a, b;
  UART1_Init(9600);               // Initialize UART module at 9600 bps
  Delay_ms(100);                  // Wait for UART module to stabilize
  TRISB = 0x00;

  while (1)
  {
    if (UART1_Data_Ready())
    {     // If data is received,
      uart_rd = UART1_Read();
    }

    if (uart_rd=='A')
    {
      LATB = 0x01;
      a = 100;
    }
    else if (uart_rd == 'B')
    {
      LATB = 0x02;
      b = 200;
    }
    uart_rd ='\0';
    
    if(a > 0)
    {
       Delay_ms(1);
       a--;
    }
    else
      LATB = 0;
    
   if(b > 0)
   {
     Delay_ms(1);
     b--;
   }
   else
     LATB = 0;
  }
}

Hi,

It depends on the required current. You can use 10K, if your target has only the IC. If your target board required more current, you need to change the resistor or even transistor.

Dear George,

You can’t do it using ADC interrupts. ADC interrupt will always generate when the A/D conversion is completed. But you can do it using Comparator Module of PIC Microcontroller.

Hi,

Thanks for asking a good question.

2.7K is the bleeder resistor to discharge capacitors when the programmer is unplugged. It will prevent unintentional “Unrecognized Device” error by ensuring proper Power On Reset when you plug in next time.

Use this link for reference : http://www.microchip.com/forums/m245280.aspx