adding

notebooks/Zhiyuan Yang/README.md

@@ -218,7 +218,7 @@ Today we had an emergency.
 It turns out that our PCB board is shorted between VDD and GND and nothing can be powered when we turned it on.
 ![PCB2](./Pictures/PXL_20211103_055900681.jpg)
 We figured out the reason is because the connector holes penetrated the main power line, which is VDD. One of the connector holes is GND.  
-![PCB2](./Pictures/footprint3.jpg)
+![PCB2](./Pictures/footprint3.JPG)
 We are actively working to fix it and get on with testing. Hope for the best!
 # 2021-11-6 PCB version 1 debugged and testing
 Today we finished testing the MCU chip on our own PCB board and it works!
@@ -354,4 +354,4 @@ else {
 ```
 Yayti and I also worked on updating the algorithms. We usually got this error that whenever our cursor moves to a direction and when it stops, it will move backwards a bit. These few lines will ensure that our mouse will go in one direction and do not go the opposite direction unless it fully stops.
 
-We finished off the project by performing various verifications that our design documents dictates. Unsurprisingly, they all passed because our project as a whole works. All the verifications can be checked under demo_videos in the git repo. 
+We finished off the project by performing various verifications that our design documents dictates. Unsurprisingly, they all passed because our project as a whole works. All the verifications can be checked under demo_videos in the git repo.