Pages: [1]   Go Down
Author Topic: Hardware for a 24*11 led matrix  (Read 396 times)
0 Members and 1 Guest are viewing this topic.
Brussels, BE
Offline Offline
Jr. Member
**
Karma: 1
Posts: 62
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Hi,

I want to build a led matrix which would display a plot of a variable (say, temperature) over time. It will look like the attached file "plot.png" (for example-- this one show that three hours ago, the temperature was 3° higher than it is now).

I'm new to led matrix designs, so I'd like some advice for choosing the hardware. My initial idea for to use three 74HC4017 counters to loop though the columns and two 74HC595 to control what to display for each columns (i.e. row control). The circuit diagram will be quite similar to this one except that it will have three counters and two shift registers.

My question are : is it possible to wire theses three counters (which count up to 10) together to emulate a counter that counts up to 24? Can I actually displays these "bars" mentionned earlier with these shift registers?

Thanks.


PS: I'm sorry if these questions look newbish ; things will become clearer to me once I'll be able to actually fiddle with these ICs, hence asking you for confirmation before ordering them. Actually, I don't even have more than a vague idea of what the Arduino program will look like, but this is for later.


* plot.png (1.33 KB, 573x251 - viewed 17 times.)
« Last Edit: August 20, 2013, 04:31:35 pm by Mad physicist » Logged


Massachusetts, USA
Offline Offline
Tesla Member
***
Karma: 212
Posts: 8933
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Yes, it looks like you can cascade three 74HC4017 decade counters to get your 24 column selectors.  After 23 clocks you can pull the Master Reset line to get back  to 0.
Logged

Send Bitcoin tips to: 1L3CTDoTgrXNA5WyF77uWqt4gUdye9mezN
Send Litecoin tips to : LVtpaq6JgJAZwvnVq3ftVeHafWkcpmuR1e

Global Moderator
Boston area, metrowest
Offline Offline
Brattain Member
*****
Karma: 545
Posts: 27352
Author of "Arduino for Teens". Available for Design & Build services. Now with Unlimited Eagle board sizes!
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Two 20mA capable output shift registers to drive parallel anodes across the screen,
http://www.digikey.com/product-detail/en/CD74AC164E/296-4235-5-ND/375630
and the TPIC6A595 shift registers to sink 220mA from the cathode rows.
http://www.digikey.com/product-detail/en/TPIC6A595NE/296-9007-5-ND/378481
Logged

Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

Brussels, BE
Offline Offline
Jr. Member
**
Karma: 1
Posts: 62
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Thank you for your replies.
Logged


Pages: [1]   Go Up
Jump to: