Just wondering which model PIC should I use. Thanks >From: Bob Ammerman >Reply-To: pic microcontroller discussion list >To: PICLIST@MITVMA.MIT.EDU >Subject: Re: [pic] LED dot matix dsiplay >Date: Tue, 14 Nov 2000 02:58:01 -0500 > >BG Micro (www.bgmicro.com) has another option. Their ACS1076, which is a HP >HDSP-2303. > >This is also a 4-digit 5x7 dot matrix 0.2" LED display. This one, however, >is much smaller. The 14-pin package is the same size as a DIP16. The >characters are 0.2" on center, and they are end-to-end stackable. > >They are supposed to be quite bright (readable in direct sunlight!), but >they suck major current (as much as 500ma when fully lit) > >The price is quite a bit lower: $1.19 for 1-9, $.89 at 10+. > >These are no where near as smart as the others, however. > >Basically, they contain a 28 bit shift register to define the current input >for the 7 rows of each of the four digits. There are 5 separate column >inputs that must be driven in sequence. > >The basic operation: > >1: Load the 28 bit shift register with the pixels for column 1 of each >character. > >2: Enable the first column driver. > >3: Delay > >4: Disable the first column driver. > >repeat steps 1 through 4 for the other 4 columns. > >go back to step 1. > >The PIC, in this case must continuously refresh (multiplex) the display. > >A PWM drive can control the brightness. > >-- >http://www.piclist.com hint: The list server can filter out subtopics >(like ads or off topics) for you. See http://www.piclist.com/#topics > > _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com. -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.