Update README.rst

add cold solder joints hint
2017-12-03 11:30:31 +01:00
parent 269625fe58
commit 19461b34d3
1 changed files with 1 additions and 0 deletions
--- a/README.rst
+++ b/README.rst
@@ -221,6 +221,7 @@ 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 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.
  #. SPI does not like long connections. Try shorter connections.