7 Segment LED mystery - Electronic Circuits Projects Diagrams Free

birdman0_o · 2nd September 2009, 04:42 AM

Ok so I am multiplexing four 7 segment LED displays. The problem is some kind of shadow from one display into the next display. For example on one it says 4 then on the one next to it (always on the left and the display scans from right to left ), it combines the number 1 with a dim 4.

I do not understand where it is coming from, the code is simple so I don't think it needs to be posted. They are all separate seven segment displays multiplexed and then connected to a 74HC595.

The delay is 3.144mS or 318 Hz, should I slow this down?

blueroomelectronics · 2nd September 2009, 04:58 AM

It's probably the code. You should turn all segments off just before the mux.

AtomSoft · 2nd September 2009, 07:14 AM

Like Bill stated try turning them all of then setting 1 on . Also do this real slow as a test like 50-100ms this way you can see if its the speed or something else. Then just speed it up little by little

Gayan Soyza · 2nd September 2009, 08:52 AM

You must clear the previous PORT value (display value) before you switch to the next display.

pcbheaven.com · 2nd September 2009, 12:50 PM

This will help:
PIC Tutorial - Interface Multiple 7seg Digits - PCB Heaven

PIC Tutorial - A 3-digits Decimal Counter - PCB Heaven

AtomSoft · 2nd September 2009, 01:30 PM

Nice links dude! hey just noticed your name and signature! Your site! so good job!

pcbheaven.com · 2nd September 2009, 02:01 PM

Thank you! I have work SO hard for this site.

AtomSoft · 2nd September 2009, 04:46 PM

dude im not even joking i just re-visited your site and omg there is so much info there. Someone should add this to the sticky :

Newcomers, please read! (PIC regarded) Upd. 0xD

Please a mod visit his site and you can confirm this. On the left hand navigation menu is lots of usefull info as well as the other top menu.

AtomSoft · 2nd September 2009, 05:23 PM

dude just a note. You have a typo in style.css in your site...

the font: "MS sans seriff" should be "MS sans serif" it wont let users print unlessed changed. You can print but it will look garbled.

pcbheaven.com · 2nd September 2009, 05:52 PM

Thanks AtomSoft, thanks a lot. As i told you, i have work very hard for this site. I am fan of free knowledge distribution and that's what i do.

And thanks a lot for noticing those mistakes i've done. You see, i try to upload a lot of quality work and i only have a few hours (if i am lucky) afternoons. I have notice many mistakes and also, my english are.... well... not so good after all... Sorry in advance for such mistakes.

AtomSoft · 2nd September 2009, 08:15 PM

the site works fine thats the main point

i tried printing using Bullzip PDF printer. It lets me turn sites into PDFs this way i can save them and print as needed.

The mistake was shown in the printing. For the amount of time you put in its awesome. and let me be the one to tell you thanks for such great info.

a_wabz_hue · 14th September 2009, 02:48 PM

hi! i'm new here. my bf is kinda bz so im looking after his li'l research.. can somebody help about the wiring diagram on 7 segment of the clock..thanks plz help me

birdman0_o · 14th September 2009, 03:39 PM

What clock?

rajbex · 11th October 2009, 04:46 AM

I have done multiplexing to interface 4 Seven-Segment Displays to a PIC16F628A using mikroC compiler. Check here: Experiments with PIC16F628A: Experiment No. 5: Multiplexed Seven Segment Displays

Raj
Experiments with PIC16F628A

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2nd September 2009, 04:42 AM	#1
birdman0_o	7 Segment LED mystery Ok so I am multiplexing four 7 segment LED displays. The problem is some kind of shadow from one display into the next display. For example on one it says 4 then on the one next to it (always on the left and the display scans from right to left ), it combines the number 1 with a dim 4. I do not understand where it is coming from, the code is simple so I don't think it needs to be posted. They are all separate seven segment displays multiplexed and then connected to a 74HC595. The delay is 3.144mS or 318 Hz, should I slow this down? __________________ Mike My website: www.ElectroBird.net

2nd September 2009, 04:58 AM	#2
blueroomelectronics	It's probably the code. You should turn all segments off just before the mux. __________________ Bill Smart Kits build Smart People http://www.blueroomelectronics.com/

2nd September 2009, 07:14 AM	#3
AtomSoft	Like Bill stated try turning them all of then setting 1 on . Also do this real slow as a test like 50-100ms this way you can see if its the speed or something else. Then just speed it up little by little __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF Nokia 6100 Driver/Software My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics

2nd September 2009, 08:52 AM	#4
Gayan Soyza	You must clear the previous PORT value (display value) before you switch to the next display. __________________ Gayan My Website http://gsmicro.blogspot.com/

2nd September 2009, 12:50 PM	#5
pcbheaven.com	This will help: PIC Tutorial - Interface Multiple 7seg Digits - PCB Heaven PIC Tutorial - A 3-digits Decimal Counter - PCB Heaven __________________ And on the eighth day God said, "Okay, Murphy, you're in charge!" www.pcbheaven.com

2nd September 2009, 01:30 PM	#6
AtomSoft	Nice links dude! hey just noticed your name and signature! Your site! so good job! __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF Nokia 6100 Driver/Software My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics

2nd September 2009, 02:01 PM	#7
pcbheaven.com	Thank you! I have work SO hard for this site. __________________ And on the eighth day God said, "Okay, Murphy, you're in charge!" www.pcbheaven.com

2nd September 2009, 04:46 PM	#8
AtomSoft	dude im not even joking i just re-visited your site and omg there is so much info there. Someone should add this to the sticky : Newcomers, please read! (PIC regarded) Upd. 0xD Please a mod visit his site and you can confirm this. On the left hand navigation menu is lots of usefull info as well as the other top menu. __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF Nokia 6100 Driver/Software My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics

2nd September 2009, 05:23 PM	#9
AtomSoft	dude just a note. You have a typo in style.css in your site... the font: "MS sans seriff" should be "MS sans serif" it wont let users print unlessed changed. You can print but it will look garbled. __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF Nokia 6100 Driver/Software My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics

2nd September 2009, 05:52 PM	#10
pcbheaven.com	Thanks AtomSoft, thanks a lot. As i told you, i have work very hard for this site. I am fan of free knowledge distribution and that's what i do. And thanks a lot for noticing those mistakes i've done. You see, i try to upload a lot of quality work and i only have a few hours (if i am lucky) afternoons. I have notice many mistakes and also, my english are.... well... not so good after all... Sorry in advance for such mistakes. __________________ And on the eighth day God said, "Okay, Murphy, you're in charge!" www.pcbheaven.com

2nd September 2009, 08:15 PM	#11
AtomSoft	the site works fine thats the main point i tried printing using Bullzip PDF printer. It lets me turn sites into PDFs this way i can save them and print as needed. The mistake was shown in the printing. For the amount of time you put in its awesome. and let me be the one to tell you thanks for such great info. __________________ AtomSofts eBay Store AtomSoftTech: C18 TIPS & TRICKS v9 PDF Nokia 6100 Driver/Software My Name: Jason Lopez http://atomsofttech.info/ \| My YouTube Videos! My Favorite Store: dipmicro Electronics

14th September 2009, 02:48 PM	#12
a_wabz_hue	hi hi! i'm new here. my bf is kinda bz so im looking after his li'l research.. can somebody help about the wiring diagram on 7 segment of the clock..thanks plz help me

14th September 2009, 03:39 PM	#13
birdman0_o	What clock? __________________ Mike My website: www.ElectroBird.net

11th October 2009, 04:46 AM	#14
rajbex	I have done multiplexing to interface 4 Seven-Segment Displays to a PIC16F628A using mikroC compiler. Check here: Experiments with PIC16F628A: Experiment No. 5: Multiplexed Seven Segment Displays Raj Experiments with PIC16F628A