ESP 32 starting up.

Two ESP WROOM 32U boards bought from TradeMe. One of them didn't seem to work.

Got blinking on other.



Not sure about which pins belong to which GPIO and how you name the pins in the Arduino IDE.

Helpful: Oscilloscope, but only showed Hi-Lo edge and not a train of  square waves. Think I've got to do things with the trigger.

Finally got blink sketch going on pin. 



Also had strange blink results. The one second blink worked well on GPIO13 but not on GPIO9 where there was a short-long train of blinks despite even delay of 1000ms. Maybe it's to do with GPIO9 is a special purpose pin and not for general blinky use.

WE see below that GPIO13 is OK, but not GPIO9, as it's part of the SPI.








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