Comments on: LED Calculator Prototyped with LCD

By: Jin

Jin — Sun, 23 Nov 2008 04:50:09 +0000

Did you ever finish your LCD module library? Or find a suitable LCD display module? I’m just starting to play around with an Arduino for a project I had in mind, and I’m looking around at various display and casing options. What were you thinking of using for a case?

By: Keith Neufeld

Keith Neufeld — Wed, 15 Oct 2008 15:24:39 +0000

Henry, what would be my motivation in doing that?

By: bateeze henry

bateeze henry — Wed, 15 Oct 2008 15:14:02 +0000

help me how to design a random flasher display unit of acalculater. thanks

By: Keith Neufeld

Keith Neufeld — Tue, 16 Sep 2008 12:15:11 +0000

Halida, are you asking me to help you cheat on a school assignment? Are you aware that:

I work at a university.
My server logs show that you're at Universiti Teknologi MARA in Malaysia.
I could probably contact your school administrators and get you placed on academic probation for soliciting someone to do your assignment.

Please, think very hard about doing your own homework. If you don't enjoy electronics and software development enough to write your own homework programs, is it really what you want to make a lifetime doing?

By: HALIDA

HALIDA — Tue, 16 Sep 2008 03:32:48 +0000

hi..i want u to help me..i have to do a project about simple calculator using Motorola 68K(Easy 68K Assembly/Editor)..I have 2 weeks more to finish my project..the input for my project is by using switch in arithmetic operations which are add,subtract and multiply..I hope that u can help me..thank u very2 much..

By: Josh Kropf

Josh Kropf — Thu, 06 Mar 2008 16:33:04 +0000

Keith,

I’ve put together a comprehensive LCD library for these hitachi based screens. It supports both 4 and 8 wire mode and all pin mappings are customizable without modifying the library code. It even supports defining custom bitmap characters in the LCD’s character ram.

For now the code lives on my site, but one of these days I should move it over to the arduino playground.

http://www.slashdev.ca/arduino-lcd-library/

By: Keith Neufeld

Keith Neufeld — Sun, 02 Mar 2008 18:04:36 +0000

George, I’ve looked into 3 1/2 digit LCDs a little, and as far as I can tell the LCD driver is always integrated into a monolithic chip performing the device’s main function (meter, clock, etc.). That makes it not at all easy to swap out the LCD for LEDs. Sorry.

By: George Onsen

George Onsen — Sun, 02 Mar 2008 17:50:41 +0000

Hi …I have a clock/thermometer with 3 1/2 LCD displey and I would like to know how to change the displey with 3 1/2 LED.Could you help me with these project.
Thank you George

By: Keith Neufeld

Keith Neufeld — Fri, 08 Feb 2008 18:58:50 +0000

Nick, I had looked through All Electronics’s offerings, and they don’t have anything small enough to fit across the short end of a deck of cards, my target size. I may not be able to get quite that small, but there’s an LCD screen close to that at Digi-Key for only $5.88 that I plan to try.

I like your alarm clock, by the way. Looks like fun!

By: nickjohnson

nickjohnson — Fri, 08 Feb 2008 18:21:06 +0000

If you’re still looking for a small, text-based LCD module, you might try all electronics: http://www.allelectronics.com/cgi-bin/category/365/LCDs_(Liquid_Crystal_Displays).html

They have a good variety of surplus HD44780-compatible LCDs at the best prices I’ve found. I even used their “lcd-107″ on this project: http://cheaphack.blogspot.com/2008/01/turing-alarm-clock.html

Nick