Sonsivri

Hi,

MAX7219 LED Driver provides a convenient way for interfacing upto 8 7-segment displays  using multiplexing. It uses a 4 wire interface to communicate with the microcontroller. This allows the controller to make better use of the processing time as the responsibility of generating the multiplexing signals is completely taken over by MAX7219.

Here is a ISIS simulation of the same using AT89C2051 with source code in Keil C.

The original source code was found on the net and was written for Hi-Tech C-51. I have ported it for Keil C.
I have ordered a MAX7219 board from ebay and shall test it in hardware later.

Cheers.

this IC is damn expensive.. though I would rather use another mcu to handle the display rather than using it in case I had critical tasks for the first mcu to handle.. can't we emulate this IC using an mcu, of course we can..

Yeah for some reason Maxim charges a small fortune for their LED drivers...  I sampled some many moons ago for a project I was doing and they certainly did the job but I eventually went with the much more economical and robust HT1632C for that project, and have used it for many other projects since then...  If you need an economical LED driver look at the HT1632C over Maxim parts...

is there no a direct replacement for MAX7219 at a lower cost?

They are less than £4 for 10.

I acquired through taobao at $ 1.2 per unit (MAX7219-21)

and they work for you?

indication on these panels made ​​of these drivers, in 2011.

Hacking a display from a volt meter could be cheaper, like this one
http://hackaday.com/2013/08/25/turning-cheap-voltmeters-into-i2c-displays/
Catcatcat, any more info on the display? Looks awesome!

This project was implemented by the climate control room "Winter Garden." For display on 8x8 LED display used driver MAX7221. This is a photo touch-pad control. This system controls the temperature. humidity and light levels in the room.

Hello,

Finally received the MAX7219 board and tested it successfully.

Cheers.

what is 7088B?

LM7088A/B - 0.70 inch 8x8 Dot Matrix LED Display

http://pdf1.alldatasheet.com/datasheet-pdf/view/574284/LIGHTKEY/LM7088BD/+_54_97VphGHuLHceRT.YHpMP+/datasheet.pdf (http://pdf1.alldatasheet.com/datasheet-pdf/view/574284/LIGHTKEY/LM7088BD/+_54_97VphGHuLHceRT.YHpMP+/datasheet.pdf)

(I hope the link works..)

link "dead" (page in maintenance or my proxy kicks me..) anyway, pdf attached

LM7088A/B is from Lightkey Opto Semiconductors

You can find their 8x8 Dot Matrix LED Displays here: http://www.lightkeyled.com/8x8-led-dot-matrix/ (http://www.lightkeyled.com/8x8-led-dot-matrix/)

where did you buy it from?

(http://catcatcat.d-lan.dp.ua/wp-content/uploads/2013/03/ILLISII-4S-00-secundo_07.png)


Output Library for information boards on the driver MAX7219, MAX7221 (http://catcatcat.d-lan.dp.ua/skachat/biblioteki/biblioteka-vyivoda-informatsii-dlya-plat-na-drayvere-max7221/)

video work (http://youtu.be/h27e45R88e4)

http://www.ebay.in/itm/MAX7219-CWG-8-Digit-I2C-IIC-Serial-Digital-LED-Tube-7-Segment-Display-Module-RED-/221519637806?pt=LH_DefaultDomain_203&hash=item3393996d2e&_uhb=1

Another link from Ebay China
http://www.ebay.com/itm/Red-MAX7219-8-Digit-LED-Display-Module-Digital-Tube-for-arduino-/161308128952?pt=LH_DefaultDomain_0&hash=item258eb6b6b8

catcatcat, correct me if I am wrong plz, I was thinking you used this IC to drive the matrix displays:
give a hint on how you managed the matrix displays using this driver, what controllers you used to build your professional display, PSUs, timing schemes and codes if possible. I am asking too many questions, sorry for that, but I am really interested in these matrix displays, not the 7-segment ones.

Posted on: August 24, 2014, 09:15:26 09:15 - Automerged

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I looked at the video linked to your page, this IC is damn amazing!!

thanks

http://www.ebay.co.uk/itm/130733916831?_trksid=p2059210.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT

very cheap

This chip is designed for seven-segment indicator, but it has a mode where you can record each segment is arbitrary, but in this mode, and it is used to control the LED matrix 8x8

And if you're looking for 8x8 matrix MAX7219 boards, 10 pieces ready to go:
(http://g04.s.alicdn.com/kf/HT1Y9QEFRtXXXagOFbXf/220833420/HT1Y9QEFRtXXXagOFbXf.jpg?size=98284&height=600&width=800&hash=c5af463fb88a1fae3025de9056785818)

AliExpress link: http://www.aliexpress.com/item/Free-shipping-10pcs-lot-MAX7219-dot-matrix-module-microcontroller-module-for-arduino-display-module-finished-goods/1878903274.html (http://www.aliexpress.com/item/Free-shipping-10pcs-lot-MAX7219-dot-matrix-module-microcontroller-module-for-arduino-display-module-finished-goods/1878903274.html)

I found this, it has more words to read than what I found on Catcatcat website:
https://sites.google.com/a/sci.cmb.ac.lk/esl/mini-projects/2012/spi-based-led-display-unit