Update README.md

Sensirion · Jul 18, 2018 · 9e70f37 · 9e70f37
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 ```
 
+### Schematics
+
+You can find the schematics for the ESS in the [ess-hardware-docs repository](https://github.com/winkj/ess-hardware-docs/blob/master/ESS_Schematic.PDF)
+
 ### Feedback
 If you have questions or suggestions, please submit an issue via github.