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Topic: Got a 4 digit LCD but... (Read 965 times) previous topic - next topic

Rookie2

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

dhenry

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.

Nick Gammon

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.
Please post technical questions on the forum, not by personal message. Thanks!

More info:
http://www.gammon.com.au/electronics

JimboZA

@Nick I think OP meant it wasn't actually that model, but a 10-pin-per-side similar one
My hovercraft is full of eels.

No PMs for help please.
DO NOT power servos from Arduino 5V: give them their own power and connect the grounds.

Rookie2

#4
Jan 10, 2013, 09:01 pm Last Edit: Jan 10, 2013, 09:31 pm by Rookie2 Reason: 1
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.

CrossRoads

Check the bottom, sometimes there is enough of a part number embedded to be able to find something.
Designing & building electrical circuits for over 25 years.  Screw Shield for Mega/Due/Uno,  Bobuino with ATMega1284P, & other '328P & '1284P creations & offerings at  my website.

Nick Gammon


@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.
Please post technical questions on the forum, not by personal message. Thanks!

More info:
http://www.gammon.com.au/electronics

dhenry

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.

Rookie2


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!

terryking228

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

dhenry

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


Those are quite different animals.

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