Pages: [1]   Go Down
Author Topic: Got a 4 digit LCD but...  (Read 803 times)
0 Members and 1 Guest are viewing this topic.
Offline Offline
Jr. Member
**
Karma: 0
Posts: 85
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

I had to buy it online as there is no electronics stores where I live.
The site where I bought the display does not show any description, brand or model about it.
So I'm a bit lost and wondering how to wire it  smiley-eek

The display is like this one



...but with 10 pins on each row.

Thanks in advance for any help
Logged

Offline Offline
Edison Member
*
Karma: 116
Posts: 2205
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

They are more difficult to drive than your typical lcds with controllers, as the mcu has to refresh the data constantly.

Your task #1 is to find the coms.
Logged

Global Moderator
Offline Offline
Brattain Member
*****
Karma: 502
Posts: 19080
Lua rocks!
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

I found a data sheet:

http://www.datasheet4u.net/datasheet/T/W/M/TWM259_Shenzhen.pdf.html

Not particularly informative, but it does give the pinouts.
Logged


Johannesburg. UTC+2
Offline Offline
Faraday Member
**
Karma: 105
Posts: 4691
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

@Nick I think OP meant it wasn't actually that model, but a 10-pin-per-side similar one
Logged

The Elders of the Internet know who I am
I'm on LinkedIn: http://www.linkedin.com/in/jimbrownza

Offline Offline
Jr. Member
**
Karma: 0
Posts: 85
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Yes exactly, what Jimbo said.


Your task #1 is to find the coms.

No idea how to do it but I will start googling it.
Thank you.
« Last Edit: January 10, 2013, 03:31:57 pm by Rookie2 » Logged

Global Moderator
Boston area, metrowest
Offline Offline
Brattain Member
*****
Karma: 545
Posts: 27361
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

Check the bottom, sometimes there is enough of a part number embedded to be able to find something.
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.

Global Moderator
Offline Offline
Brattain Member
*****
Karma: 502
Posts: 19080
Lua rocks!
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

@Nick I think OP meant it wasn't actually that model, but a 10-pin-per-side similar one

Oh I see. That picture had 20 pins per side.

Quote
The site where I bought the display does not show any description, brand or model about it.

Doesn't sound like a bargain if you have no idea how to use it.

If you are going to buy online (as I do) I suggest you buy something that has Arduino support. Stuff like the displays from Adafruit, Sparkfun, etc.
Logged


Offline Offline
Edison Member
*
Karma: 116
Posts: 2205
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
No idea how to do it

Use your arduino to generate a (roughly) 100hz signal. Take the GND (or VCC) pin and the signal pin, and apply them to any two pins on the lcd.

As you slide around the signal pin, and see lots of segment liting up, the GND pin is on a com.
Logged

Offline Offline
Jr. Member
**
Karma: 0
Posts: 85
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
No idea how to do it

Use your arduino to generate a (roughly) 100hz signal. Take the GND (or VCC) pin and the signal pin, and apply them to any two pins on the lcd.

As you slide around the signal pin, and see lots of segment liting up, the GND pin is on a com.

Thank you. Luckily I managed to get the datasheet from the store!
Logged

Topsham, Vermont USA
Offline Offline
Edison Member
*
Karma: 33
Posts: 1926
... in The Woods In Vermont
View Profile
WWW
 Bigger Bigger  Smaller Smaller  Reset Reset

Hi,
Let us know how it works out...

If you get to feel it's too much trouble and way too many pins to control, think about only 2 pins on an I2C controlled display like these:
http://arduino-info.wikispaces.com/LCD-Blue-I2C
Logged

Regards, Terry King terry@yourduino.com  - Check great prices, devices and Arduino-related boards at http://YourDuino.com
HOW-TO: http://ArduinoInfo.Info

Offline Offline
Edison Member
*
Karma: 116
Posts: 2205
View Profile
 Bigger Bigger  Smaller Smaller  Reset Reset

Quote
think about only 2 pins on an I2C controlled display like these:

Those are quite different animals.
Logged

Pages: [1]   Go Up
Jump to: