Closed MeCK-Frog closed 3 years ago
The mfrc522 does not use i2c. This Chinese boards are wrong labeled for years.... For SS (spi select) you can chose any free pin. So just change line:
#define SS_PIN 21 // RC522のSDA指定
@marcelstoer Can be closed.
Dear developers
I have a question because an error of unknown cause has occurred when RC522 and SSD1306 are combined. If you don't show the display, the RC522 works fine, but if you show the display, the RC522 doesn't work. I believe SSD1306 is occupying SDA. Do you know the cause?
I will attach the source code. Thank you.