Sunday, June 1, 2014

Modification to RS485 Shield - Arduino Web Logger

Finally, we are using SD card.

In Ethernet Shield use Pin 4 as SD_CS.  If we just leave everything as it is, we are not going to be able to use them.


  • Pin 3: RX
  • Pin 4: TX
  • Pin 2: DE
We are going to modify it so that it becomes:
  • Pin 3: RX
  • Pin 5: TX
  • Pin 2: DE

I'm going to cut RS-485 Shield.

In all previous codes I used Pin 4 as TX, and because I don't want to fix all the codes I soldered a wire onto the pin.  So now I can move TX to Pin 4 or Pin 5 depending on what I need.

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