mvadu Posted January 3, 2007 Report Share Posted January 3, 2007 Hi I am working on a digital Speedo project. I need to display speed reading in 3:1 digits (three digits and one decimal). Digits should be big enough to read from distance..(as Honda Civic has in its dashboard)I am thinking about using PIC16F628A for communication. But I am not sure about type of LCD I should use either a character based (like 20x7) where by joining lot of black dots i can make a digit, or a graphical display..As per my logic even text displays can be used to display big digits, if multiple character blocks are used to display a single digit. Like the one in my example image. Only thing is digits will not be sharp, there will be some white lines in-between two dots. So alternative is to use a graphical LCD, but my concern is I never worked with graphical LCD, I am not sure whether 16F628 is enough for that or not So you need to suggest me now..1. What kind of LCD should i use graphical or character2. PIC16F628 is enough or notPlease note that I played only with this PIC till today in JAL, i never used a graphical LCD.. 3. Availability and cost of the LCD you suggestedPlease note that I am not bothered about temp. In India (that too in Bangalore) through out the year we have almost constant temp ;)attached is a sample display which i am looking for.. Quote Link to comment Share on other sites More sharing options...
Ldanielrosa Posted January 4, 2007 Report Share Posted January 4, 2007 Have you considered using LED? Bright by day and dim by night. If you don't mind committing a microcontroller to the display, then it should work nicely.If you have already decided that it must be LCD, then one I can suggest for economic reasons is the screen from an older Nokia cellular telephone if you can rescue it from the garbage can. The LCD is about 20*30mm- about the minimum size you would want. It uses a 5 wire serial protocol. The display will require some reworking to mount it, and 1-2k of program space (including font). Quote Link to comment Share on other sites More sharing options...
mvadu Posted January 4, 2007 Author Report Share Posted January 4, 2007 Ya.. even LED is also fine, but the reason why I switched to LCD is other than displaying speed in big fonts, i planed to show up odometer readings also in say 1minute intervals in small fonts. And using cellphone display is not possible because I need a font height of 1 inch, and 4-5 such characters. So display size is somewhere arround 1.5*3.5 inch. which is not there in old phones.Is it possible to get a character LCD display in 20x15 range.. :-\ Quote Link to comment Share on other sites More sharing options...
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