Hope someone can shed some light!
I have a leonardo and rc522.. all is well, however I need a smaller footprint so pro micro fits the bill.
Purchased a clone off amazon, same code as leonardo, with different rst and sda pins (5 &10 as the build on line).
Will not read a mifare card, good or bad. However passed the rc522 self diagnostics.
I know the rc522 is good.. works with leonardo, other functions of the pro micro are working.. pwm and digital outputs.
Tests done with standard library examples
I was concerned that the voltage divider 10k/20k to get 3.3v might not be giving enough to let the rc522 do its thing (30ma required).. so I built a lm317 regulator. No change.
Suggestions or solutions welcome.