Post by thread:Display

87654321 wrote: > > I wanted to get a cheap 20*2 or 20*4 character display....with the hitachi > 44780 chip in it....whats a cheap place to get this....good quality too...i > don't want the thing dieing on me after a while... why the 44780 ? excuse the question but I to have a project needing 20x2 alphanumeric and am as yet totaly unbiased (ignorant) and am just curious. Tony M

Hi Tony, > > I wanted to get a cheap 20*2 or 20*4 character display....with the hitachi > > 44780 chip in it....whats a cheap place to get this....good quality too...i > > don't want the thing dieing on me after a while... > why the 44780 ? excuse the question but I to have a project needing 20x2 > alphanumeric and am as yet totaly unbiased (ignorant) and am just Industry standard. Actually hard to get anything else in Alpha-numeric displays by accident. Use 8 bit or 4 bit to drive and all the code samples on the list and web sites will work (with minor tweaks). Cheers -- Kalle Pihlajasaari .....kalleKILLspam@spam@data.co.za Interface Products Box 15775, Doornfontein, 2028, South Africa +27 (11) 402-7750 Fax: +27 (11) 402-7751

>> I wanted to get a cheap 20*2 or 20*4 character display....with the hitachi >> 44780 chip in it....whats a cheap place to get this....good quality too...i >> don't want the thing dieing on me after a while... > > why the 44780 ? excuse the question but I to have a project needing > 20x2 alphanumeric and am as yet totaly unbiased (ignorant) and am just > curious. Tony M It's about as close to an industry standard as you can get. Build h/w for the '44780 i/f and write s/w for the '44780 command set, and you can plug in almost any small LCD module and expect it to work. ___Bob

>> why the 44780 ? excuse the question but I to have a project needing 20x2 >> alphanumeric and am as yet totaly unbiased (ignorant) and am just > >Industry standard. Actually hard to get anything else in >Alpha-numeric displays by accident. > >Use 8 bit or 4 bit to drive and all the code samples on the >list and web sites will work (with minor tweaks). > Just to reiterate what I said before, get every source you can for LCD displays because there's a lot of confusion and inaccuracies. I have two Hitachi 44780 datasheets at home with different/wrong information. I have found inconsistancies and errors in three "FAQs" out on the Web. I now have four code examples (including the MPC "C" Routines) which have inconsistancies as well. I currently have the Optrex databook on order from Digi-Key. I *think* I have a complete database on what these things do and how to program them in different modes. But, it took several hours at the kitchen table going through all these sources trying to understand what was really going on. The Hitachi datasheets I felt were really inexcusable. They are, however, pretty robust designs and while the four examples I have are for four different devices (PIC, 6800, COP-8, and 8051) and are radically different (one doesn't even reset the device, just allows the natural power up into 8 bit mode), they do demonstrate how robust the 44780 is in terms of interfacing (although I haven't tested each program out). Myke Do you ever feel like an XT Clone caught in the Pentium Pro Zone?

>87654321 wrote: >> >> I wanted to get a cheap 20*2 or 20*4 character display....with the hitachi >> 44780 chip in it....whats a cheap place to get this....good quality too...i >> don't want the thing dieing on me after a while... >why the 44780 ? excuse the question but I to have a project needing 20x2 >alphanumeric and am as yet totaly unbiased (ignorant) and am just >curious. Tony M > > I saw this display heavily used in projects...... its easy to find info on it and people have already made programs for it...so it would be easier for me