nguada

[font="consolas;"][color=rgb(0,0,255);][color=rgb(0,0,0);]Hello Guys!
 
Sorry in advanced for next newbie questions about Netduino and 74HC595N...
 
I'm so new working with Netduino 2 Plus. I've been testing all labs and tests that I found on Internet (Sparkfun, Adafruit, Netduino's wiki, enthusiast and go on...)
 
Also, I've been studying a lot about how other people have been building very interesting projects using 74HC595N ICs to multiplex serial data and handle parallel bits on several ways (best examples: Led Cube or using SPI devices).
 
However, I'm stuck in some points because my background is not on electrical matters, but is on software development. Actually, I read all "Newbie" project that I found on this forum:[/color]
http://forums.netdui...-74hc595-chips/
http://wiki.netduino...le-74HC595.ashx [color=rgb(0,0,0);]and finally[/color]
http://wiki.netduino...t-Register.ashx
 
[color=rgb(0,0,0);]I understood very well how the shift register works and also I built the whole lab (CIRC-05 | 8 more Leds), and actually worked fine, but I noticed that, when I code to turn HIGH all my leds using this simple program:[/color][/color][/font]

[font="consolas;"][color=rgb(0,0,255);] [/color][/font]

[font="consolas;"][color=rgb(0,0,255);]public[/color][/font] [font="consolas;"][color=rgb(0,0,255);]static[/color][/font] [font="consolas;"][color=rgb(0,0,255);]void[/color][/font][font="consolas;"] Test()[/font]

[font="consolas;"]{[/font]

[font="consolas;"][color=rgb(43,145,175);]OutputPort[/color][/font][font="consolas;"] data = [/font][font="consolas;"][color=rgb(0,0,255);]new[/color][/font] [font="consolas;"][color=rgb(43,145,175);]OutputPort[/color][/font][font="consolas;"]([/font][font="consolas;"][color=rgb(43,145,175);]Pins[/color][/font][font="consolas;"].GPIO_PIN_D11, [/font][font="consolas;"][color=rgb(0,0,255);]false[/color][/font][font="consolas;"]);[/font]

[font="consolas;"][color=rgb(43,145,175);]OutputPort[/color][/font][font="consolas;"] clock = [/font][font="consolas;"][color=rgb(0,0,255);]new[/color][/font] [font="consolas;"][color=rgb(43,145,175);]OutputPort[/color][/font][font="consolas;"]([/font][font="consolas;"][color=rgb(43,145,175);]Pins[/color][/font][font="consolas;"].GPIO_PIN_D13, [/font][font="consolas;"][color=rgb(0,0,255);]false[/color][/font][font="consolas;"]);[/font]

[font="consolas;"][color=rgb(43,145,175);]OutputPort[/color][/font][font="consolas;"] latch = [/font][font="consolas;"][color=rgb(0,0,255);]new[/color][/font] [font="consolas;"][color=rgb(43,145,175);]OutputPort[/color][/font][font="consolas;"]([/font][font="consolas;"][color=rgb(43,145,175);]Pins[/color][/font][font="consolas;"].GPIO_PIN_D12, [/font][font="consolas;"][color=rgb(0,0,255);]false[/color][/font][font="consolas;"]);[/font]

[font="consolas;"][color=rgb(0,0,255);]for[/color][/font][font="consolas;"] ([/font][font="consolas;"][color=rgb(0,0,255);]int[/color][/font][font="consolas;"] i = 0; i < 8; i++)[/font]

[font="consolas;"]{[/font]

[font="consolas;"] latch.Write([/font][font="consolas;"][color=rgb(0,0,255);]false[/color][/font][font="consolas;"]);[/font]

[font="consolas;"][color=rgb(0,0,255);] for[/color][/font][font="consolas;"] ([/font][font="consolas;"][color=rgb(0,0,255);]int[/color][/font][font="consolas;"] j = 0; j < 8; j++)[/font]

[font="consolas;"] {[/font]

[font="consolas;"][color=rgb(0,0,255);]   if[/color][/font][font="consolas;"] (i == 2 || i == 3 || i == 4 || i == 5 || i == 6 || i == 7)[/font]

[font="consolas;"]   {[/font]

[font="consolas;"]   data.Write([/font][font="consolas;"][color=rgb(0,0,255);]true[/color][/font][font="consolas;"]);[/font]

[font="consolas;"] }[/font]

[font="consolas;"][color=rgb(0,0,255);]   else[/color][/font]

[font="consolas;"]   {[/font]

[font="consolas;"]   data.Write([/font][font="consolas;"][color=rgb(0,0,255);]false[/color][/font][font="consolas;"]);[/font]

[font="consolas;"]   }[/font]

[font="consolas;"]   clock.Write([/font][font="consolas;"][color=rgb(0,0,255);]true[/color][/font][font="consolas;"]);[/font]

[font="consolas;"][color=rgb(43,145,175);]   Thread[/color][/font][font="consolas;"].Sleep(1);[/font]

[font="consolas;"]   clock.Write([/font][font="consolas;"][color=rgb(0,0,255);]false[/color][/font][font="consolas;"]);[/font]

[font="consolas;"] }[/font]

[font="consolas;"]   latch.Write([/font][font="consolas;"][color=rgb(0,0,255);]true[/color][/font][font="consolas;"]);[/font]

[font="consolas;"][color=rgb(43,145,175);]   Thread[/color][/font][font="consolas;"].Sleep(500);[/font]

[font="consolas;"]}[/font]

[font="consolas;"]data.Dispose();[/font]

[font="consolas;"]clock.Dispose();[/font]

[font="consolas;"]latch.Dispose();[/font]

[font="consolas;"]}[/font]

[font="consolas;"]all leds bright, but too low (almost you cannot see if there are on or off). According with the package, all leds are:[/font]

[font="consolas;"]5 mm super bright blue 3.2V 20mA[/font]

[font="consolas;"]According with Netduino 2 Plus spec (http://www.netduino....plus2/specs.htm), each pin have:[/font]

[font="consolas;"]max current: 25mA per pin[/font]

[font="consolas;"]digital I/O are 3.3V -- but 5 V tolerant[/font]

[font="consolas;"]and according with 74HC595N specs sheet(http://ardx.org/data.../IC-74HC595.pdf), each pin output is:[/font]

[font="consolas;"]+/- 35mA[/font]

[font="consolas;"]I used several combinations for registers:[/font]

[font="consolas;"]a) Using 100 ohm register connected to each cathode and then to ground[/font]

[font="consolas;"] Using 100 ohm register connected to each anode and each cathode to ground directly[/font]

[font="consolas;"]c) With no registers!![/font]

[font="consolas;"]Always I received the same (each led turns on, but the bright is too low) results[/font]

 [font="consolas;"]So, my questions are:[/font]

[font="consolas;"]1.) Do I need to use some kind of capacitor to increase the amount of voltage to get the right current?[/font]

[font="consolas;"]2.) What connections (pin to pin) do I need to care about? (I mean, I'm connecting 5V pin to a breadboard, and from the breadboard I'm connecting directly to 74HC595 pin 16 (VCC).[/font]

[font="consolas;"]Again, sorry for this newbie question...[/font]

[font="consolas;"]I hope that somebody can help me to understand this scenario[/font]

[font="consolas;"]Kind regards![/font]