From e42287a3b3342f8590a597ebc0ed552551b75337 Mon Sep 17 00:00:00 2001
From: Jiawen Gong <jiawengong1112@gmail.com>
Date: Tue, 12 Dec 2023 09:37:52 +0000
Subject: [PATCH] Update file week12.md

---
 docs/assignments/week12.md | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/docs/assignments/week12.md b/docs/assignments/week12.md
index 648c49a..b1249af 100644
--- a/docs/assignments/week12.md
+++ b/docs/assignments/week12.md
@@ -258,6 +258,10 @@ But an hour later it decides to do some work and this is the neopixel show all t
 
 I want my crystals to flash white for 2 seconds and then stops for 2 seconds.
 
+Here is a very useful video on how to do that:
+
+<iframe width="1000" height="400" src="https://www.youtube.com/embed/z1IGAbIFGnk?si=tfGQKLB7yPL2Uyc9" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen></iframe>
+
 And here's the code:
 
     #include <Adafruit_NeoPixel.h>
-- 
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