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Forum Index : Microcontroller and PC projects : LCD display via SPI

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boss

Senior Member

Joined: 19/08/2011
Location: Canada
Posts: 268
Posted: 04:22pm 11 Apr 2012
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Good morning,

to save precious Maximite pins in my aplication I connected LCD (or VFD) display via SPI (3 wire connection)

2012-04-12_022125_LCD.zip

Regards
boss
 
Geoffg

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Joined: 06/06/2011
Location: Australia
Posts: 3194
Posted: 08:43pm 11 Apr 2012
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That is so neat... only 3 pins to control a lot of output.

Geoff
Geoff Graham - http://geoffg.net
 
boss

Senior Member

Joined: 19/08/2011
Location: Canada
Posts: 268
Posted: 08:55pm 11 Apr 2012
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Thank you Geoff,

and you can concatenate these chips to get as much pins as needed for price 30c/chip include shipping on eBay.

boss
 
plasma
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Joined: 08/04/2012
Location: Germany
Posts: 437
Posted: 11:14pm 11 Apr 2012
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where can i get this display module ?
 
djuqa

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Joined: 23/11/2011
Location: Australia
Posts: 447
Posted: 12:10am 12 Apr 2012
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Noritake-ITron VFD modules are available at
Element 14 (Farnell) although they are a lot more expensive ($70usd or greater)than
the LCD character displays (From $3Usd) or LCD Panels/Displays (from $20).

Boss,
Great idea using those chips.

Edited by djuqa 2012-04-13
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ernie
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Joined: 18/03/2012
Location: Australia
Posts: 14
Posted: 02:36am 12 Apr 2012
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  plasma said   where can i get this display module ?


Just do a search on eBay for "LCD SPI" there are heaps. Be careful not to get the touch screen ones, they use the SPI for the touch co-ordinates, and parallel for the actual LCD display data.

 
djuqa

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Joined: 23/11/2011
Location: Australia
Posts: 447
Posted: 02:39am 12 Apr 2012
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  ernie said  
  plasma said   where can i get this display module ?

Just do a search on eBay for "LCD SPI" there are heaps. Be careful not to get the touch screen ones, they use the SPI for the touch co-ordinates, and parallel for the actual LCD display data.
Yes , but I think OP was asking about the VFD modules in photos.
Plus using those chips + std LCD modules are cheapier solution.
Edited by djuqa 2012-04-13
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boss

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Joined: 19/08/2011
Location: Canada
Posts: 268
Posted: 02:45am 12 Apr 2012
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From time to time these displays are on eBay. And sometimes for very reasonable price. Personally I liked VFD much more than LCD.
 
djuqa

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Joined: 23/11/2011
Location: Australia
Posts: 447
Posted: 02:48am 12 Apr 2012
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  boss said   From time to time these displays are on eBay. And sometimes for very reasonable price. Personally I liked VFD much more than LCD.
cheapest I have seen is $50 for 16x2 each , unlike lcd which I get for 30usd posted for 10Edited by djuqa 2012-04-13
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boss

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Joined: 19/08/2011
Location: Canada
Posts: 268
Posted: 03:05am 12 Apr 2012
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You have to search and You will find:

the best deal is 2pcs VFD 20x4 for ~50$

http://www.ebay.ca/sch/Electrical-Test-Equipment-/92074/i.ht ml?_trkparms=65%253A12%257C66%253A2%257C39%253A1%257C72%253A 6098&rt=nc&_nkw=vfd%20display&_dmpt=BI_Electrical_Equipment_ Tools&_trksid=p3286.c0.m14.l1513&_pgn=2

http://www.ebay.ca/itm/20X2-Serial-SAMSUNG-VFD-LCD-Module-Di splay-20T202DA2JA-/190409174276?pt=LH_DefaultDomain_0&hash=i tem2c55456d04

20x4 is here
http://www.ebay.ca/itm/Noritake-Itron-CU20045SCPB-VFD-Displa y-/250963413638?pt=LH_DefaultDomain_0&hash=item3a6e95ca86

boss
 
djuqa

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Joined: 23/11/2011
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Posts: 447
Posted: 03:09am 12 Apr 2012
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I did search and do search on eBAy daily


http://www.ebay.ca/itm/Noritake-Itron-CU20045SCPB-VFD-Displa y-/250963413638?pt=LH_DefaultDomain_0&hash=item3a6e95ca86
that last one $66 USD posted to Aussie
For that I can buy a DuinoMite , 20x4 LCD plus 4.5inch lcd composite (rear view monitor) screen. Edited by djuqa 2012-04-13
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boss

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Joined: 19/08/2011
Location: Canada
Posts: 268
Posted: 03:21am 12 Apr 2012
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You are right, I'm living close to the US border a I have the shipping address in US as well. So I can purchase those from US Ebay for US price and shipping (~15$/pc).
LCDs are good enough and much less expensive.

boss
 
djuqa

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Joined: 23/11/2011
Location: Australia
Posts: 447
Posted: 03:57am 12 Apr 2012
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No worries
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plasma
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Joined: 08/04/2012
Location: Germany
Posts: 437
Posted: 03:59am 12 Apr 2012
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ok fine thx for all comments.
its to expensive , so i bought a rear view monitor on ebay .
 
paceman
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Joined: 07/10/2011
Location: Australia
Posts: 1329
Posted: 11:16am 12 Apr 2012
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There are two very good tutorials on how to use serial in, parallel out shift registers (74HC595's) for these applications. One at the Arduino site which also has several good examples.

http://www.arduino.cc/en/Tutorial/ShiftOut

The other one is at BILDR blog:

http://bildr.org/2011/02/74hc595/

Greg

 
LG046
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Joined: 02/08/2012
Location: Netherlands
Posts: 12
Posted: 07:00am 15 Aug 2012
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  boss said   You are right, I'm living close to the US border a I have the shipping address in US as well. So I can purchase those from US Ebay for US price and shipping (~15$/pc).
LCDs are good enough and much less expensive.

boss
on dealextreme there are also SPI LCD serial connection only these have more then 3 connectors?
youi only need volts to power 1 data and 1 ground right?
so where are these other connections for

is mmbasic alreadt compatible with these screens? like al the code and stuff in it?

here is a example what i did find on DX

http://www.dealextreme.com/p/arduino-iic-i2c-serial-2-6-lcd- 1602-module-display-142567?item=10
 
BobD

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Joined: 07/12/2011
Location: Australia
Posts: 935
Posted: 07:57am 15 Aug 2012
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  LG046 said   on dealextreme there are also SPI LCD serial connection only these have more then 3 connectors?
youi only need volts to power 1 data and 1 ground right?
so where are these other connections for

is mmbasic alreadt compatible with these screens? like al the code and stuff in it?

here is a example what i did find on DX

http://www.dealextreme.com/p/arduino-iic-i2c-serial-2-6-lcd- 1602-module-display-142567?item=10

The particular board you mention is not SPI but I2C . I2C needs 4 connections. See the lower image on the page which shows the connections on the daughterboard.

I2C support is included in MMBasic on the Maximite however you need to write your own driver (in MMBasic) for each display module. You may even find someone has already done that.
 
MicroBlocks

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Joined: 12/05/2012
Location: Thailand
Posts: 2209
Posted: 09:32am 15 Aug 2012
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I have the ubw32 with colourmm controlling a 2x40 LCD and/or a 2x16 OLED.
It uses 1 serial port for each, actually only the TX so the RX is still free for other things, like a GPS for instance.
The serial to parallel is done by a picaxe. Very easy stuff and by using the com ports in mm you just print the characters.
I have a small subroutine that adds some delays otherwise some data is lost.
The ubw32 has lots of gpio but using them for accessing an lcd parallel which can be done of course will cause some internal pic32 devices to not be available anymore.
Using the serial uses only 1 pin.

Microblocks. Build with logic.
 
LG046
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Joined: 02/08/2012
Location: Netherlands
Posts: 12
Posted: 05:23am 16 Aug 2012
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  TZAdvantage said   I have the ubw32 with colourmm controlling a 2x40 LCD and/or a 2x16 OLED.
It uses 1 serial port for each, actually only the TX so the RX is still free for other things, like a GPS for instance.
The serial to parallel is done by a picaxe. Very easy stuff and by using the com ports in mm you just print the characters.
I have a small subroutine that adds some delays otherwise some data is lost.
The ubw32 has lots of gpio but using them for accessing an lcd parallel which can be done of course will cause some internal pic32 devices to not be available anymore.
Using the serial uses only 1 pin.

then you have SPI? or are you working with I2C just not the rx connected??Edited by LG046 2012-08-17
 
MicroBlocks

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Joined: 12/05/2012
Location: Thailand
Posts: 2209
Posted: 07:06am 16 Aug 2012
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No just from mmbasic using a com port.
That is just a rs-232 (ttl levels).
The picaxe is equivelent to this: Oled
(This OLED is very nice, even readable under extreme angles.)
The pixace that controls the oled has some software that accepts command via a serial port. The same picaxe can also use a 2x40 or any other lcd.
You can even change the firmware and add functionality as the pic has some free pins available that can be used for buttons or other things.


Microblocks. Build with logic.
 
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