Update README.md

Author: educ8s

README.md

@@ -20,3 +20,10 @@ Watch the video here: https://www.youtube.com/watch?v=GsrugNJ2JXU
 
 
 💖 Full disclosure: All of the links above are affiliate links. I get a small percentage of each sale they generate. Thank you for your support!
+
+# Schematic
+
+<p align="center">
+  <img src="SchematicST7920.png" alt="Schematic Diagram" width="640">
+</p>
+