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Author Topic: MAX7219 LED Driver simulation using 8051  (Read 1961 times)
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micropcb
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« on: August 19, 2014, 08:15:46 08:15 »

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.
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metal
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« Reply #1 on: August 19, 2014, 10:57:17 10:57 »

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..
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CocaCola
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« Reply #2 on: August 19, 2014, 12:14:40 12:14 »

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...
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metal
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« Reply #3 on: August 19, 2014, 01:56:37 13:56 »

is there no a direct replacement for MAX7219 at a lower cost?
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pickit2
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« Reply #4 on: August 19, 2014, 02:23:03 14:23 »

They are less than 4 for 10.
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Catcatcat
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« Reply #5 on: August 20, 2014, 04:40:02 04:40 »

I acquired through taobao at $ 1.2 per unit (MAX7219-21)
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metal
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« Reply #6 on: August 20, 2014, 08:56:08 08:56 »

and they work for you?
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Catcatcat
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« Reply #7 on: August 20, 2014, 05:56:52 17:56 »


indication on these panels made ​​of these drivers, in 2011.
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baoshi
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« Reply #8 on: August 23, 2014, 03:58:11 15:58 »

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!
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Catcatcat
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« Reply #9 on: August 23, 2014, 04:59:12 16:59 »

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.
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micropcb
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« Reply #10 on: August 23, 2014, 05:52:00 17:52 »

Hello,

Finally received the MAX7219 board and tested it successfully.

Cheers.

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metal
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« Reply #11 on: August 23, 2014, 09:57:46 21:57 »

what is 7088B?
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str67
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« Reply #12 on: August 23, 2014, 11:10:51 23:10 »

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

(I hope the link works..)
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TucoRamirez
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« Reply #13 on: August 23, 2014, 11:25:34 23:25 »

link "dead" (page in maintenance or my proxy kicks me..) anyway, pdf attached
« Last Edit: August 23, 2014, 11:27:47 23:27 by TucoRamirez » Logged

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biko4710
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« Reply #14 on: August 24, 2014, 01:06:33 01:06 »

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/
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metal
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« Reply #15 on: August 24, 2014, 04:44:15 04:44 »

Hello,

Finally received the MAX7219 board and tested it successfully.

Cheers.



where did you buy it from?
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Catcatcat
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« Reply #16 on: August 24, 2014, 05:44:07 05:44 »




Output Library for information boards on the driver MAX7219, MAX7221

video work
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micropcb
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« Reply #17 on: August 24, 2014, 05:47:53 05:47 »

where did you buy it from?

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
« Last Edit: August 24, 2014, 04:35:02 16:35 by micropcb » Logged
metal
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« Reply #18 on: August 24, 2014, 07:23:22 07:23 »

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

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

thanks
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pickit2
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« Reply #19 on: August 24, 2014, 10:38:55 10:38 »

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

very cheap
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« Reply #20 on: August 24, 2014, 02:36:27 14:36 »

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

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

thanks

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

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biko4710
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« Reply #21 on: August 25, 2014, 05:08:59 17:08 »

where did you buy it from?
And if you're looking for 8x8 matrix MAX7219 boards, 10 pieces ready to go:


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
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metal
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« Reply #22 on: August 25, 2014, 06:01:11 18:01 »

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
« Last Edit: August 25, 2014, 06:46:36 18:46 by metal » Logged

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