Update README.rst

SPI is sensitive to electromagnetic noise
2017-01-26 16:05:11 +01:00
parent 8d014ca908
commit fe0e15ec29
1 changed files with 2 additions and 0 deletions
--- a/README.rst
+++ b/README.rst
@@ -196,6 +196,8 @@ Troubleshooting
  #. Check your connection, see `Pin Layout`_ .
  #. 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 do not like long connections. Try shorter connections.
+  #. SPI do not like prototyping boards. Maybe try a soldered connections.
  #. According to reports #101, #126 and #131, there may be a problem with the soldering on the MFRC522 breakout. You could fix this on your own.