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Forum Index : Microcontroller and PC projects : LCD for DM,MM
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Bryan1 Guru  Joined: 22/02/2006 Location: AustraliaPosts: 1344 |
G'day Guy's, Well after fall on sunday night after a few ales while walking down the hill I ended up with 7 stitch's in my leg so pretty immobile for a week or so. Anyway it has been ages since I had a play with my DM and MM boards so today I decided to get them out and try and get my 20x4 lcd working. I got the lcd from Microzed years ago and the sheet that came with it said the lower 4 bits are used in 4 bit mode. Toady I found the LCD Datasheet for it and nowhere does it say anything about 4 bit mode. I did a bit of research on this forum and the work done by James and Ray has taught me a heap about the subject so by going off that said Microzed sheet I went ahead and made a circuitboard to suit the arduino connector on my DM mega. I also have the shield board so I can test it also on my SM1 MM board. I used the lower 4 bits and Jame's library files and no way can I get rid of the box's on line 1 and 3. Now as per the DM instructions I used the pins 13-18 with 10K pullups for the datalines. Now from back in my ASM days all I had to do was invert the bits but now I reckon I'll have to have a go using the upper 4 bits with the hope I can get this lcd working. Edit: on reading the controller DS I have found it is the upper 4 bits and each line starts at 1. 80h, 2. C0h, 3. 94h, 4. D4h so with a bit of tweaking hopefully i can get this lcd working so I can then start on the MOD-GPS. Cheers Bryan |
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MicroBlocks Guru Joined: 12/05/2012 Location: ThailandPosts: 2209 |
Don't forget the delays, start with long ones when you are testing. Microblocks. Build with logic. |
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| Bryan1 Guru Joined: 22/02/2006 Location: AustraliaPosts: 1344 |
G'day guy's, Well tried for a while on both the DM mega and the SM1 board with both the 20x4 and a brandnew 16x2 LCD and still no luck. I even tried Geoff's code on the SM1 with the 16x2 and still no go. So today I'm going to setup the 20x4 on a 8 bit pic (16f887) and get the lcd working. I wote some code in Oshonsoft basic last night and it does sim ok so today I'll breadboard the circuit and go from there. Cheers Bryan |
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