Hi, I'm using the 3.3V version of the Arduino Pro and a bunch of low-current-LEDs (they need about 2mA each). Since I need every port the Arduino offers, I've also connected LEDs to the Rx and Tx pins, which doesn't affect the upload of new sketches (they're just flickering simular to the orignal R…

LEDs on pin 0/1 not as bright as on other pins?

system June 12, 2010, 2:13pm 5

According to the schematic, both rx and tx have 1k ohm series resistors fitted.

Have you removed them?

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