In SX Microcontrollers, SX/B Compiler and SX-Key Tool, javalin wrote:

Hi,

I would look at using a darlington transister IC to act as a "switch" controlled by the SX pin.  The SX is unlikely to be able to power 45 LEDS off of one pin.  The darlington will switch the power on/off dependant on how the pin is set on the SX - i.e. High or Low.

There is a Nults and Volts article on this, on the www.parallax.com website.  Its book1, article number 6

I would guess the leds in parallel would give the best brightness - not 100% but im sure somebody else will correct if this is not the case!  I think serial leds will suffer from voltage drop further down the line.

Hope this helps.

James

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