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LDmicro Forum - 7 SEGMENTOS |
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7 SEGMENTOS (by Manuel)
te mando foto
(no subject) (by MGP)
Why do you always post pictures? I can't make any changes to them on my computer because none of the lines are straight.
I don't like that schematic with the 7414, but I'd like the project file with the setup in the photo below. I also have Proteus, but I never use it and could test it myself. So, could you post that Proteus file? One more thing: why are you using CA displays and not CC displays? Have you bought them yet?
(no subject) (by MGP)
Never mind, there's something wrong with Proteus.
I'll try it on a breadboard tomorrow and let you know.
7 SEGMENTOS (by Manuel)
HOLA MGP Me preguntas por que uso Ca y no CC porque avía comprado una remesa en CA yo no soy muy experto tu que sabes mucho de esto me podrís explicar la diferencia descarga el archivo se abre con proteos Un saludo Manuel
(no subject) (by MGP)
CC displays aren't better, but they are easier to work with. You can use a ULN2803 (or NPN transistors) to drive them, which are very common.
A CA display usually uses PNP transistors, so you have to invert the outputs of #PORTB. This doesn't improve readability, but the operation remains the same. The diagram below shows how you can drive these anodes with PNP transistors.
(no subject) (by MGP)
I stripped down your program because I only wanted to test the displays.
The display module in the photo has PNP transistors and SMD resistors on the back of the board. I also programmed a different scan generator (C11 is now 'tel') because the C11 counter was much too slow to drive 9 displays. You could see the scan performance and that was very poor. The program now works 100%, and you can continue building with it. Be careful not to make the program too long; 1mS cycle time isn't much.
(no subject) (by MGP)
Now the photo of the test.
(no subject) (by MGP)
Photo2
Btw, do not forget adding pullup/pulldwn resitors when using push buttons.
(no subject) (by MGP)
After testing, I forgot to put something back in the program.
In rung20, you need to change the equation [tel>=9] to [tel>=10], otherwise display 9 won't be shown.
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