Do you have any idea or suggestion how should I connect my sensor to my 2nd input of my PIC (RD1)?  I am really confused with the three wires, I know positive to brown, negative to blue, but in the circuit shown in the sensor it says that after connecting the black wire to my load, I need to connect the other side of the load to the brown wire again. I am really confuse how should I connect this to the PIC.

Thanks.

Edit, when I have interface the PIC with my relay with LED as output, the circuit works perfectly with the program of my PIC.

But, when I change the output of the relay to motor, when I press the button, the motor would not turn on (the relay did not switch on also), but when I turn on the relay manually by connecting the input of relay to VCC, the motor works perfectly. It seems the input of my relay cannot detect anything from output of PIC when I switch the output of relay to motor, while when with LED it works perfectly.

Any solution to this?

Hi, thanks for your advice. It works now with a micro switch and with a slight change in the code.

Sorry, keep bothering you with a question. Do you have any sample circuit or guide to interface an inductive proximity sensor with the PIC16F877A?

Thank you very much.

Okay, I finally get the program now. Tried it with push button today.

Can you please suggest a way to make the program only loop by one time? Afterwards if I press the push switch again then the program run again, I just want it to only run once, each time is only start by myself but not automatically by the infinite loop.

Your help is really important and appreciated. Thanks.

Hi there, sorry to disturb you again. I have tested the above code with my PIC16F877A, when I have input for RD0, LED 1 turns on (I replace motor with LED first for testing). Then when I have input for RD1, the LED 1 turns off then LED 2 turns on for 5 seconds and turn off, but once it has turned off, LED 2 lights up again, then after 5 seconds it turns off again and this loop keeps on repeating.

I wonder if those code you posted in your website is all on looping? If I just want all the sequence above just to happen once, and then when I press the push button again, the sequence happens again, I don’t want them to be repeating by themselves, shall I just remove the part “do while”?

Or should I use any “return” command for my code in order for them to return to all original state after the sequence finish?

Thank you for your advice. Your quick reply is very much appreciated.

Hi there, below is the code I tried to write according to your tutorials:

void main()
{
  TRISD.F0 = 1; //RD0 as Input PIN 1
  TRISD.F1 = 1; //RD1 as Input PIN 2

  TRISB.F0 = 0; //RB0 as Output PIN 1
  TRISB.F1 = 0; //RB1 as Output PIN 2

  PORTB.F0 = 0; //Motor clockwise direction flow OFF
  PORTB.F1 = 0; //Motor anticlockwise direction flow OFF

  do
  {
    if(PORTD.F0 == 0) //If Switch is presseed
    {
      delay_ms(100); //Provides required delay
      if(PORTD.F0 == 0) //If Switch is still pressed
      {
        PORTB.F0 = 1; //Motor turns in clockwise direction
        if(PORTD.F1 == 1) //If Signal is sent from proximity sensor
        {
          PORTB.F0 = 0;
          PORTB.F1 = 1;
          delay_ms(10000);
          PORTB.F1 = 0; //After 10 seconds the motor is turned off
        }
      }
    }
  }while(1);
}

The part where the proximity sensor sends a signal, if(PORTD.F1 == 1), the input should be 1 right?

Also, do you need a constant flow of current from input, in order for the output to be able to work constantly? Like if I press the switch once, the motor turns clockwise, but if I cut off the current from the switch, will the motor still keep turning or it will stop??

Furthermore, will this code works in MPLAB or Hi-tech? I know the code is almost similar with just a slight modification, just need to know about this, if I want to program them in other software, anything else to add to the code?

One more question, the voltage of the signal sent from my proximity sensor is quite high, which my PIC16F877A couldn’t stand the voltage as the maximum is 5V, so any solution to this to lower down the signal voltage from my proximity sensor? I’ve searched the internet, I found something about opto-isolator, can I use that?

Your help is greatly appreciated as this is a very urgent project, thanks.