16f877 led program

If you think this will work , you are in for a surprise. Posted by Arun Vijay at AM. Labels: how to tutorial's? Newer Post Older Post Home. Subscribe to: Post Comments Atom. Google me Enter your search terms Web roboticsforyou Submit search form.

HOME Mechdesign. PIC Program. But you should select the device according to your brightness requirement. Last but not the least, this section lists all details on how to interface an LED with a pic microcontroller.

But you can always find a peak forward current value from the datasheet. We can easily calculate the current limiting resistor value R1 by using this equation:. You must be thinking why do we need to use a resistor while interfacing an LED with Pic microcontroller? According to the PIC18F microcontroller datasheet, the maximum current a single pin can provide up to 25mA.

Another reseason is because of the peak forward current of the light-emitting device. Each pin can be used both as a digital input or a digital output. As its name suggests, this 7-bit register is used to set the direction of data. In other words, it defines the nature of pin either as a digital input or a digital output. Note: RC4 and RC5 pins can be used only as digital input pins only.

This code blinks an LED with a delay of one second. This section describes a LED sequencer circuit designed using a pic microcontroller. The sequencer circuit generates a blinking pattern sequence with a specified pattern. As you can see in this circuit, it blinks alternate LEDs with a sequence of one, two and three respectively. In this section, we explain how to interface an LED with a pic microcontroller and programming using MikroC Pro for pic compiler.

The circuit diagram and the simulation will be done in Proteus. A resistor is used as a current limiting resistor. Because the maximum current a single pin can provide to LED is 5mA. To simulate the circuit as per our desired function i. The while loop will execute infinite times. This process is repeated until the program is aborted.

This causes the blinking of the LED. The speed of the Blinking LED can be increased or decreased by varying the delay value. Super Member. Hi prime Dear Mr. MPASM as a few utility built-in macros One of them is " banksel " that takes care of handling the RAM bank selection And for handling program flash memory paging exists " pagesel ". Best regards Jorge. Hi After a quick look, your code doesn't look too bad, but - You forgot the explicitly indicate the destination F or W on a number of instructions.

I supose you have them defined in the IDE, but I would suggest to have them defined in your source file or a working project can fail in the day you move it to another computer. Or is the PIC stalled due to lack of clock? Thanks a lot Jorge. Can you help me with an example on which kind of instructions i have to explicitly define the destination and how the operand should looks like?

So i downloaded another file where the code is written in C and this code is blinking the LED and taking interrupts to allow change of delay time. And this C program select oscillator as 'HS' in the configuration bits , so i too select this in my initial project and change 'XT' to 'HS'.

Here i attached the c code for your reference. I even tried to measure the output signal of the pin with an oscilloscope for my program and the output has not signal at all when i turn on the pic.

Hi David, I as well added in some comments as you suggested. Thanks in advance. Attachment s led blinking. Yep, "F" and "W" are already defined in the header files, so you can use them as destination instead of ,1 and ,0. Hi Take a look at the contents of the "P16FA. Dario already noted that even the "F" and "W" equates for the destination operand are there.

Yes, the missing destination is the "decfsz" instructions, and yes, the deafult is "File", but I allways recomend not trusting in defaults.