Can anyone explain the BreadBoard layout for this... - Electronic Circuits Projects Diagrams Free

Blueprint · 29th June 2005, 01:42 AM

Ok, the "technical" diagram is here:

http://techref.massmind.org/techref/...pic/bincnt.htm

and I have set up my breadboard, but something's not working. The PIC is all coded up ready to go, its in the centre of my board... but something's not working right

.

I must admit, I don't much understand the right side of the "technical diagram". You can see my version of the breadboard (sorry for the bad image!) at the following URL:

http://www.teamblueprint.com/bb_eg.JPG

Any advice/help would be much appreciated.

Thanks

The Real MicroMan · 29th June 2005, 02:19 AM

looks like your VDD and VSS lines are switched

williB · 29th June 2005, 03:30 AM

i would like to help, what dont you understand about the right side of the diagram??

YAN-1 · 29th June 2005, 04:27 AM

I was looking at the circuit you are supposed to build. Shouldn't the capacitors of the crystal be connected to ground instead of Vdd?

**Nigel Goodwin** · 29th June 2005, 07:59 AM

Quote:

Originally Posted by YAN-1

I was looking at the circuit you are supposed to build. Shouldn't the capacitors of the crystal be connected to ground instead of Vdd?

It makes no difference, Vdd and Vss are at the exact same potential as far as AC is concerned - so it should work fine either way.

Blueprint · 29th June 2005, 09:11 AM

Ok i've tken 6 shots of my breadboard as it is at the moment. Please help, it's not working. Don't worry there are no resistors there yet:

http://www.teamblueprint.com/bb/bb1.jpg
http://www.teamblueprint.com/bb/bb2.jpg
http://www.teamblueprint.com/bb/bb3.jpg
http://www.teamblueprint.com/bb/bb4.jpg
http://www.teamblueprint.com/bb/bb5.jpg
http://www.teamblueprint.com/bb/bb6.jpg

Thanks.

**Jay.slovak** · 29th June 2005, 09:16 AM

Scheme seems fine to me, try to place crystal closer to the PIC and shorten it's leads (not PICs leads, the wires that connect PIC and crystal).

**Nigel Goodwin** · 29th June 2005, 09:42 AM

Quote:

Originally Posted by Jay.slovak

Scheme seems fine to me, try to place crystal closer to the PIC and shorten it's leads (not PICs leads, the wires that connect PIC and crystal).

I agree, the layout is absolutely horrible - personally I don't like (or use) breadboards, and this gives a good example of why not 8)

You should keep leads as short as possible, particularly round the crystal and associated capacitors - check the veroboard layout for the 876 board in my tutorials, you will see how close I place the crystal to the pins!.

williB · 29th June 2005, 10:12 AM

Just a thought, have you got the diodes hooked in correctly..?
also ,you can use the resistors, in place of the wires, going from the outputs to the diodes ..
so from any one output pin you would have a resistor , a diode , and a wire to ground..

**Jay.slovak** · 29th June 2005, 10:15 AM

Quote:

Originally Posted by Nigel Goodwin

Quote:

Originally Posted by Jay.slovak

Scheme seems fine to me, try to place crystal closer to the PIC and shorten it's leads (not PICs leads, the wires that connect PIC and crystal).

I agree, the layout is absolutely horrible - personally I don't like (or use) breadboards, and this gives a good example of why not 8)

You should keep leads as short as possible, particularly round the crystal and associated capacitors - check the veroboard layout for the 876 board in my tutorials, you will see how close I place the crystal to the pins!.

Nigel, I never had a problem with my Breadboard. I know it's not very appropriate for HF stuf (like crystals

) but If you try to make connections short and place it far from any other HF noise, it will work fine. This is a trade-off for simplicity of usage 8)

JFDuval · 29th June 2005, 11:19 AM

Hello!

Is it me or on this schematic, the two quartz capacitors are going to the positive? Shouldn't they go to the GND?

eblc1388 · 29th June 2005, 11:32 AM

Quote:

Originally Posted by JFDuval

Hello! Is it me...... ?

It is you. See posting above by YAN-1 & the answer by Nigel.

Blueprint · 29th June 2005, 11:40 AM

Hi,

I REALLY appreciate all of your advice! I'm at work at the moment, so can't change anything yet, but if you could let me know what I need to change when I get home I'd be most grateful.

So far I see I need to move the crystal closer... shorten the wire lengths. I'm not using any resistors yet either. So yeah, if you could let me know what steps to take when I get home that;d be great. Is the wiring correct?

Ed
Design & Marketing Manager
www.svp.co.uk

**mechie** · 29th June 2005, 11:54 AM

Looking at the original drawing of your layout and the third photo (detailing the crystal circuit area) ...

Do I see a wire from the PIC pin 15 going to the wrong side of a capacitor (ending up connecting to the power rail) ?

(A wire from breadboard column 15 to column 4 (should be column 5) :?:

As far as breadboards are concerned I use them for prototyping, I always try to keep the crystal wires short and away from any source of interference but I have never had any problems (as per Jay's posting).

I think if you move this ONE wire it may just burst into life (you need some LED resistors though!)

Blueprint · 29th June 2005, 12:03 PM

Haha thanks... sod the LED's if they blow, they blow... Im screwed when it comes to choosing resistors, i got a lucky bag from Maplin, but i calculate all of them to be over 100mA which doesn't help seeing as i'm only using 3.5v to start with, all the other electronics and shizzle... I need a low mA resistor. It'll be ok.

(I know that's a bad attitude to have, but i'm desperate to get it working, without using too high-a-resistor giving me the impression it's not working!).

Thanks again. Which I could give something back in return but i'm shocking at this stuff... just learning!

Ed
Design & Marketing Manager
www.svp.co.uk

29th June 2005, 01:42 AM	(permalink)
Blueprint New Member	Can anyone explain the BreadBoard layout for this... Ok, the "technical" diagram is here: http://techref.massmind.org/techref/...pic/bincnt.htm and I have set up my breadboard, but something's not working. The PIC is all coded up ready to go, its in the centre of my board... but something's not working right . I must admit, I don't much understand the right side of the "technical diagram". You can see my version of the breadboard (sorry for the bad image!) at the following URL: http://www.teamblueprint.com/bb_eg.JPG Any advice/help would be much appreciated. Thanks __________________ www.teamblueprint.com expl0ring the r00t 0f y0ur b0x

29th June 2005, 04:27 AM	(permalink)
YAN-1 Experienced Member	I was looking at the circuit you are supposed to build. Shouldn't the capacitors of the crystal be connected to ground instead of Vdd? __________________ World.......behold........YAN is coming

29th June 2005, 09:11 AM	(permalink)
Blueprint New Member	Ok i've tken 6 shots of my breadboard as it is at the moment. Please help, it's not working. Don't worry there are no resistors there yet: http://www.teamblueprint.com/bb/bb1.jpg http://www.teamblueprint.com/bb/bb2.jpg http://www.teamblueprint.com/bb/bb3.jpg http://www.teamblueprint.com/bb/bb4.jpg http://www.teamblueprint.com/bb/bb5.jpg http://www.teamblueprint.com/bb/bb6.jpg Thanks. __________________ www.teamblueprint.com expl0ring the r00t 0f y0ur b0x

29th June 2005, 09:16 AM	(permalink)
Jay.slovak Super Moderator	Scheme seems fine to me, try to place crystal closer to the PIC and shorten it's leads (not PICs leads, the wires that connect PIC and crystal). __________________ "I share, thus I am" Jay.slovak Read this! ICD2 Clone Best PIC/DsPIC Bootloader Read my Inchworm ICD2 review!

29th June 2005, 11:19 AM	(permalink)
JFDuval Experienced Member	Hello! Is it me or on this schematic, the two quartz capacitors are going to the positive? Shouldn't they go to the GND? __________________ JFDuval jfduval --@-- aqra.ca http://www.aqra.ca

29th June 2005, 02:19 AM	(permalink)
The Real MicroMan Experienced Member	looks like your VDD and VSS lines are switched

29th June 2005, 03:30 AM	(permalink)
williB Experienced Member	i would like to help, what dont you understand about the right side of the diagram??

29th June 2005, 10:12 AM	(permalink)
williB Experienced Member	Just a thought, have you got the diodes hooked in correctly..? also ,you can use the resistors, in place of the wires, going from the outputs to the diodes .. so from any one output pin you would have a resistor , a diode , and a wire to ground..

29th June 2005, 11:40 AM	(permalink)
Blueprint New Member	Hi, I REALLY appreciate all of your advice! I'm at work at the moment, so can't change anything yet, but if you could let me know what I need to change when I get home I'd be most grateful. So far I see I need to move the crystal closer... shorten the wire lengths. I'm not using any resistors yet either. So yeah, if you could let me know what steps to take when I get home that;d be great. Is the wiring correct? Ed Design & Marketing Manager www.svp.co.uk __________________ www.teamblueprint.com expl0ring the r00t 0f y0ur b0x

29th June 2005, 11:54 AM	(permalink)
mechie Super Moderator	Deliberate mistake ? Looking at the original drawing of your layout and the third photo (detailing the crystal circuit area) ... Do I see a wire from the PIC pin 15 going to the wrong side of a capacitor (ending up connecting to the power rail) ? (A wire from breadboard column 15 to column 4 (should be column 5) :?: As far as breadboards are concerned I use them for prototyping, I always try to keep the crystal wires short and away from any source of interference but I have never had any problems (as per Jay's posting). I think if you move this ONE wire it may just burst into life (you need some LED resistors though!) __________________ I need a memory upgrade ... My head is full !

29th June 2005, 12:03 PM	(permalink)
Blueprint New Member	Haha thanks... sod the LED's if they blow, they blow... Im screwed when it comes to choosing resistors, i got a lucky bag from Maplin, but i calculate all of them to be over 100mA which doesn't help seeing as i'm only using 3.5v to start with, all the other electronics and shizzle... I need a low mA resistor. It'll be ok. (I know that's a bad attitude to have, but i'm desperate to get it working, without using too high-a-resistor giving me the impression it's not working!). Thanks again. Which I could give something back in return but i'm shocking at this stuff... just learning! Ed Design & Marketing Manager www.svp.co.uk __________________ www.teamblueprint.com expl0ring the r00t 0f y0ur b0x

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