diff --git a/basic_concepts/index.html b/basic_concepts/index.html
index b7f715b8da45362096bb686a10b6b530cc0b0007..a0857b1693ceaa13e60c080d295dfb490f8a6e28 100644
--- a/basic_concepts/index.html
+++ b/basic_concepts/index.html
@@ -93,6 +93,8 @@ A good starting point for newcomers in the electronics field looking for what is
 
     ![combined-circuits](imgs-filippos/8.JPG)
 
+  ### [Resistors and switches](https://roberthart56.github.io/SCFAB/SC_lab/Sensors/Button/index.html)
+
   ### Circuit Analysis
 
       - Goal: volatge and current prediction within a purely resistive powered by a direct current (dc) source such as a battery