smarcus3

After you talking about the security and all I don’t want to annoy IT with connecting a non-work device. I wish I could think of a completely new project, but I’ve been having trouble. I’ll have to ponder it.

I really just need to come up with a new project idea.

I was just thinking the same thing. Haven't tested it out. I'm sure its a security thing.

I use it to access an http website.

1) okay.

2) isn't a problem of brightness, but of voltage compability: you must match the correct voltage. All the HC595 should be supplied using +5V only, and the resistors raised so that the max current won't be overflown. Note that is just a problem regarding the value of the resistors, nothing else.

3) A LCD backlight requires about 150mA for shining. It's a led matrix/array, which has to be correctly powered. In which way could you limit the current whereas is too much? In the schematic of Szymon, the transistor must "eat" everything is over the necessary, causing (1) overheat and (2) power wasting. A simple resistor is enough: it is *NOT* the best solution, but it's damn simple.

4)
http://highfieldtale...y-for-netduino/




5) and 6) Stefan is a very valuable guy, but sometime is...running too fast, without actually watching at standard solutions, or commonly used patterns.
Take this chip, which is very common in the past: http://socrates.berk...iles/DM9368.pdf
It's a HEX-to-7 seg display decoder. The wiring of the display must follow the correct pattern, otherwise the result will be nonsense.

The MAX7219 is also a good idea. Please, consider the http://www.austriamicrosystems.com/ chips as well: they offer several interesting chips, yielding management of led-matrix, RGB-leds, etc.

Cheers

Good points once again. Where would the resistor go per point 3