From c8b922c8a4c26baf1b66924e925401f6c265dfd4 Mon Sep 17 00:00:00 2001 From: Rotzbua Date: Tue, 12 Jun 2018 15:15:18 +0200 Subject: [PATCH] add notice according to #299 --- README.rst | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/README.rst b/README.rst index eea66bc..452cdd6 100644 --- a/README.rst +++ b/README.rst @@ -223,7 +223,8 @@ Troubleshooting * **I don't get input from reader** or **WARNING: Communication failure, is the MFRC522 properly connected?** - #. Check your connection, see `Pin Layout`_ . + #. Check your physical connection, see `Pin Layout`_ . + #. Check your pin settings/variables in the code, see `Pin Layout`_ . #. Check your pin header soldering. Maybe you have cold solder joints. #. Check voltage. Most breakouts work with 3.3V. #. SPI only works with 3.3V, most breakouts seem 5V tollerant, but try a level shifter.