8-Digit Numeric LED Display 2015-07-09

[Val Gretchev]

Val Gretchev submitted a new article:

8-Digit Numeric LED Display - A display driver module for 8 digits with only 9 lines.

Sometime you just need a numeric 7-segment LED display in your project. Here is one that is suitable for up to 8 display modules and uses only nine lines to interface to the display. The driver module is connected to the microcontroller with only 3 signal lines. Just add +3.3V and ground and a few external components and you are ready to go. The software to drive the circuit will have to wait for another day.

Read more about this article...

 

[Tony Stewart]

Bad links

How about serial interface?

The chip you will use is a MAX7219 serially interfaced 8-Digit LED display driver chip

 

[Val Gretchev]

I forgot to post the Bill of Materials. It's posted now.

 

[Tony Stewart]

I forgot to post the Bill of Materials. It's posted now.

Still bad **broken link removed**

 

[Val Gretchev]

That is a well known bug. Ask ETO.

 

[Tony Stewart]

That is a well known bug. Ask ETO.

Try another method, I have no problem and i am just down the road... Use a hyperlink to google drive or MS share or Dropbox

 

[Val Gretchev]

See **broken link removed**
I have nothing else to post at this time. However, your suggestion of using a link to Dropbox is a good one. I'll keep that in mind for the future.

 

[Mike - K8LH]

Did you build this display or is it simply a design?

Regards, Mike

 

[Val Gretchev]

Hi Mike
I had the boards manufactured in Beijing by PCBWay. They are on their way to me. When I receive them, I will put them together with the components I bought already from Digi-Key. I already have written most of the code but want to debug it with actual hardware before I publish the whole thing. It should be a week or two at the most.
Val

 

[Val Gretchev]

The code is finished and published. Let me know if it was useful.

 

[jomaliens]

Hello
I am going to be installing about 25 low power (.2W) LED's around deck for accent lighting.

I would like to power them off a single 20W mean well outdoor transformer.
**broken link removed**

I have a lot of older style X10 modules, appliance modules (AM466), motion sensors and the X10 sundowner (SD533) that I usually use for Christmas lighting

I would like to use the sundowner to control the AM466 which the transformer would be plugged into.

Has anyone done this or have any suggestions. I'm on a budget and would like to use what I have but would appreciate feedback before I purchase the transformer.

thanks in advance.
-Jomal

 

[Tony Stewart]

I use a surplus laptop charger and match power LED string to voltage and distribute with AWG 16 or 18 wire.
Charger is powered by a cheap programmable timer box.

With 65W avail at 18 or so, I may lose 1 or 2 V after a long path ( AWG 16 better) around the fence, garden and house exterior. This becomes the current limiting resistor

Here I used a 12.0V SMPS with AWG18 along the eaves and AWG 30 to the MCPCB with 4x Cree LEDs each in plastic spray coated cheap $2 Chinese Lanterns all in parallel with no series R.