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PN532 - DO NOT use GPIO15 for SS on Wemos D1 Mini (use GPIO16 for SS instead)

Open hellebauer opened this issue 4 years ago • 1 comments

The recommended connections for PN532 are shown in chart below. It says to use GPIO15 (D8) for SS. That did not work for me.

The problem is that GPIO15 is also used for Reset on Wemos D1 Mini boards. As a result, Power-on Reset and Reset-button no longer worked on my Wemos, while the PN532 SS-signal was hooked up to GPIO15.

I rewired the SS to GPIO16 (D0) on my Wemos and all was well afterwards. (Don't forget to set SS=GPIO16 in the esprfid user interface).

**** WIRING BELOW WILL CAUSE ISSUES with Wemos D1 Mini and PN532: image

hellebauer avatar Dec 02 '21 10:12 hellebauer

@hellebauer should we write this somewhere in the documentation, do you think?

matjack1 avatar Mar 09 '22 21:03 matjack1

Just found this and fixed my Wemos D1 mini that wouldn't boot when connected to the PN532, thank you.

BaconWithThat avatar Jan 11 '23 03:01 BaconWithThat

Similar with my ESP8266 dev board. Set and connected to GPIO15 just seemed to jam it up. Wifi wasn't available either. I had to connect SS on the PN532 to GPIO5 (D1) Because GPIO16 (D0) is connected to the onboard LED.

BarrMo avatar Jan 26 '23 04:01 BarrMo

I hope that the new doc here: https://github.com/esprfid/esp-rfid/pull/589 sort everything out in the documentation side

matjack1 avatar Mar 28 '23 20:03 matjack1