I'm playing around with an Arduino Mega 2560 (SainSmart manufacture), and I'm confused by a disparity between the schematic and the standard example "Blink" program.
indicates the built-in LED is on PB7/pin 26. However, the Blink example uses pin 13.
I've confirmed the LED is indeed on pin 13, but changing the pin number and re-uploading the Blink program, confirming it doesn't blink, reverting it to pin 13, re-uploading, and confirming it blinks. This is frustrating, because now I can't trust the schematic for predicting which pins I should use.
Why does the actual device have a different pinout than the official schematic? Is SainSmart mis-wiring their version of the board or am I missing something?