PIC16F84 Experiments

BASIC Stamp, Microchip PIC, 8051, and Remote Control Projects

PicBasic Experiments With The PIC16F877

This application shows how to use the PIC16F877 Port D to blink LEDs attached to the port-pins. The LED blink routine is pretty basic, but can be useful if you're a beginner, and it comes in handy to test your PIC programmer.

Figure 1: LED connections for blink experiment.

Figure 1 shows the schematic used for this experiment. The Port D I/O-pins are used in output mode to blink the LEDs attached to each port-pin.

Here is the PicBasic code:

' PicBasic Pro program to blink all the LEDs on PORTD

i       var     byte    ' Define loop variable

LEDS    var     PORTD   ' Alias PORTD to LEDS


TRISD = %00000000       ' Set PORTD to all output

loop:   LEDS = 1        ' First LED on
        Pause 500       ' Delay for .5 seconds

        For i = 1 to 7  ' Go through For..Next loop 7 times

                LEDS = LEDS << 1' Shift on LED one to left
                Pause 500       ' Delay for .5 seconds

        Next i

        Goto loop  ' Go back to loop and blink LED forever
        End

YES -- I know it's simple, but we all started blinking LEDs at some point....;o]

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