Update README.md

brittanybull · web-flow · commit 16ca8c5cef1c · 2018-07-23T14:35:10.000+02:00
diff --git a/README.md b/README.md
@@ -1,2 +1,6 @@
 # sample_voltage
 Sample project for measuring voltage data from the PB04
+
+###### source code
+
+Adapted from the "measuring voltage" example in the [xPB04 library](https://github.com/xinabox/xPB04)
