Can't get blink circuit to work :(

[Techbuilder]

Hi
I was hoping someone can help me with this.

I want to start using pics but I can't even get my blink circuit to work.

I have PIC basic pro
and I use micro code studio.

My programmer is from ebay

I have knowledge in electronics but little knowledge in Micro controllers.

So I have done my board over and over again and nothing no led blinking

I have tried this

@ DEVICE pic16F84, XT_OSC

@ DEVICE pic16F84, WDT_OFF
' Watchdog Timer

@ DEVICE PIC16F84, PWRT_ON
' Power-On Timer

DEFINE OSC 4


TrisB = %00000000 ' Sets all bits portb as outputs

loop:
High PORTB.0 ' Turn on LED connected to PORTB.0
Pause 1500 ' Delay for 1.5 seconds

Low PORTB.0 ' Turn off LED connected to PORTB.0
Pause 1500 ' Delay for 1.5 seconds

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


and this

' Example program to blink an LED connected to PORTB.0 about
' once a second

loop:
High 0 ' Turn on LED connected to PORTB.0
Pause 500 ' Delay for .5 seconds

Low 0 ' Turn off LED connected to PORTB.0
Pause 500 ' Delay for .5 seconds

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


and nothing

I have re done my circuit over and over again and nothing

On my bread board I didn't use any filters on the 78L05
would that really matter and not make it blink?

Ps: the pictures of my programmer software and settings they are on are in the attachments

[Pic_User]

Hi Techbuilder,

1) Do you have a resistor pull-up on PIC MCLR to Vdd (+)?

2) Are you using a PIC16F84 (as written in the code) or a 16F84A (as listed in your programmer jpg)?
There is a big difference between the PIC16F84 and the PIC16F84A to the compiler, software, and programmer.

3) You should have a capacitor at the input to the regulator if the unregulated filter capacitor is over three inches away from it.

4) Do you have a 4 MHz crystal with capacitors to ground or a ceramic resonator with center tap to ground on the osc pins?

-Adam-

[Techbuilder]

Yep I have a resistor there

Yep I have a 16F84A

As for the 78L05 That doesn't have a cap
but can it stop the circuit from working?

I have a 4mhz resonator with the middle going to ground

[Pic_User]

Yep I have a resistor there

Yep I have a 16F84A

As for the 78L05 That doesn't have a cap
but can it stop the circuit from working?

I have a 4mhz resonator with the middle going to ground

The “DEVICE” in your code is listed as a “@ DEVICE pic16F84”

See this thread:
Novice 16F84A BLINK LED program help
http://www.picbasic.co.uk/forum/showthread.php?t=6763

The 78L05 or any three terminal linear regulator needs an “input capacitor”, if it is a distance from the rectifier filter capacitor.
If you don’t have a rectifier filter capacitor, THAT is a problem.

-Adam-

[Techbuilder]

Ohh opps even when I reprogrammed it still nothinghttp://www.picbasic.co.uk/forum/images/icons/icon9.gif
Unhappy

The link you gave me was different from mine.

His at least turned on

mine doesn't even do that

Shouldn't the sample program work from pbp?

[Pic_User]

Ohh opps even when I reprogrammed it still nothinghttp://www.picbasic.co.uk/forum/images/icons/icon9.gif
Unhappy

The link you gave me was different from mine.

His at least turned on

mine doesn't even do that

Shouldn't the sample program work from pbp?

Hi Techbuilder,

You are right, the other poster had a slightly different problem, with the PIC16F84A not blinking correctly, than you have.
But, if you could read some of the parts that MIGHT apply to your general problem, that would save the people trying to help, from repeating the same information.
It is a little easier to read than to type, and it is the reader needing the information not the person helping. This reduces the burden on the people helping, so that they do not get burned out and stop trying to help.
In fact it is considered good forum practice to search diligently, for any answered problem, that could contain a clue, before asking.

Some of the parts that MIGHT apply:

But, you may be trying too hard. Most of the defines are already supplied by the default *.INC file (16F84A.INC).

In Microcode Studio make sure you are using the button for Compile(ing) AND Program(ing), NOT the button for just Compile(ing).

See this microEngineering Labs web page:

Specifying configuration bit settings in PICBASIC PRO programs.
If you add a configuration directive to your program file, you are actually replacing the default configuration that the compiler would otherwise include. The easiest way to determine the correct syntax is to get examples from the compiler and assembler's built-in resource files. To that end, it's best to understand how the compiler determines the config defaults....

....The first thing the compiler looks for is a file in the PBP folder that matches the targeted PIC. If you tell it to compile for a 16F84A, it reads the file "16F84A.INC". The contents of this file are divided into 2 sections, one for each assembler. An internal variable, "PM_USED", tells the compiler which section of the file to use. In the following example, you will see that the top section ("ifdef" to "else") is meant for the PM assembler and the bottom section ("else" to "endif") is meant for the MPASM assembler.

http://www.melabs.com/support/config_defaults.htm

This might mean that if you refer to a different device in your code, compiler or programmer, you may run into trouble.

Let us know if you have tried any of our posted suggestions.

Did you add the capacitor to the 78L05?
Did you change the DEFINES in your code to @ DEVICE pic16F84A

The sample PBP program should work for your project, don’t give up.

-Adam-

[Andy Wood]

Hi Techbuilder,

1) Do you have a resistor pull-up on PIC MCLR to Vdd (+)?

2) Are you using a PIC16F84 (as written in the code) or a 16F84A (as listed in your programmer jpg)?
There is a big difference between the PIC16F84 and the PIC16F84A to the compiler, software, and programmer.

3) You should have a capacitor at the input to the regulator if the unregulated filter capacitor is over three inches away from it.

4) Do you have a 4 MHz crystal with capacitors to ground or a ceramic resonator with center tap to ground on the osc pins?

-Adam-

A capacitor between the output of the regulator and ground is *very* important to stop the device oscillating at high frequency. Try a value of 100nF.

Andy

[Techbuilder]

A capacitor between the output of the regulator and ground is *very* important to stop the device oscillating at high frequency. Try a value of 100nF.

Andy

Would that be necessary though if I used a power supply instead of a voltage regulator?

[sayzer]

Also,

How did you connect your LED to PORTB.0 ?

Usually, people make simple mistakes about it, and connect it WRONG.

___________________________________

[Techbuilder]

Well I connected it the positive side to PortB and connected the other side to ground.

If I didn't use a resistor would that stop the circuit from working just wondering?

[Archangel]

Hi
I was hoping someone can help me with this.

I want to start using pics but I can't even get my blink circuit to work.

I have PIC basic pro
and I use micro code studio.

My programmer is from ebay

Hi Techbuilder,
ebay programmer is not too descriptive, which one, which software are you using. I use the cheapest ebay programmer, a JDM clone with Ponyprog(free). It came bundled with winpc or winpic, I do not remember, only that I couldn't get it to work with that programmer, although it rang all the bells and blew all the whistles . . . my point is , maybe you really are not programming the PIC at all. After programming, read the program back and see if it is there, if not maybe you are not connected to the port your programmer thinks it is.
Now if you are programming, then next check your hardware, use a DVM, VOM or VTVM, an led or any other suitable method to check the pin connection of your PIC to the wires you have pushed into the proto board, I have been tripped up numerous times due to defective proto boards, after taking one apart I understood why, wear and corrosion made the connections bad.
JS

[Techbuilder]

I did read it I found some parts useful

I haven't got the chance to get the capacitors but I used my friends variable power supply and adjusted it to 5 volts and still nothing.

As for my programmer software

It's Micro Pro

I don't know if you had seen the picture attachments of the screen shots I did but that is how it looks.

It's K149-BC

I don't if that matters but that is what model it is

I can't compile and program because It doesn't download the new hex file I created
gary goddard had went through this problem that I had.

The solution is to compile then go into the programmer software and load the hex file.

I believe it's programming though because it's reading from the pic

[Techbuilder]

I got it to work!!!

You guys are the best and females (if there are any)



Cool now I can start some projects

[sayzer]

...and females (if there are any)
...

I know one so far.

[Acetronics2]

Hi, Sayzer

I know one so far.

We suspected it a bit ... AND, Of course it is yours !!!

But do not worry ... we all say "she" 's the one, even under torture !

She also always claim "he" 's the one ... buuuut, never tells who is "he" !!!

Have a nice day ... LOL.

Alain

[nomad]

fried LED?
unfiltered regulator?

curious minds would like to know..
(as well as the next person with the same/similar problem)

[sayzer]

Hi, Sayzer



We suspected it a bit ... AND, Of course it is yours !!!

But do not worry ... we all say "she" 's the one, even under torture !

She also always claim "he" 's the one ... buuuut, never tells who is "he" !!!

Have a nice day ... LOL.

Alain

Alain,

Are you saying what I think you are saying about her?

"She" is actually an imaginary person then, isn't she?


_____________________

[Acetronics2]

Alain,

Are you saying what I think you are saying about her?

"She" is actually an imaginary person then, isn't she?


_____________________

YESSSS, of course ...

All the women we're in love with are imaginary persons .... Thanks to god !!!

re- LOL

Alain