Add the images to the document

docs/group_assignments/group2/assignment4.md

@@ -23,12 +23,30 @@ We used Keysight InfiniiVision DSOX3102A, a digital storage oscilloscope.
 
 ## Measurements 
 
+The following figures (Figures 1, 2, 3) show schematics of the connection between the programmed microcontroller and oscilloscope.
+
+The following figures (Figures 4, 5, and 6) show measurements at the oscilloscope.
+
+![Measurementphoto](./assets/assignment4/schematic_photos/mikrocontrolledRP_soldered.jpg)
+
+![Measurementphoto](./assets/assignment4/schematic_photos/ESP32C3.jpg)
+
+![Measurementphoto](./assets/assignment4/schematic_photos/ESP32C3readings.jpg)
+
+![Measurementphoto](./assets/assignment4/schematic_photos/SMD.jpg)
+
+![Measurementphoto](./assets/assignment4/schematic_photos/RP22.jpg)
+
+![Measurementphoto](./assets/assignment4/schematic_photos/RP22connections.jpg)
+
 ![oscilloscope measurement](./assets/assignment4/oscilloscope/RP2040.png)
 
 ![oscilloscope measurement](./assets/assignment4/oscilloscope/ESP32C3.png)
 
 ![oscilloscope measurement](./assets/assignment4/oscilloscope/SAMD21.png)
 
+Signal frequency for XIAO RP2040, XIAO ESP32C3, and XIAO SAMD2 is...,..., and,... respectively.
+
 ## Schematics
 
 Write here which pins were used for each 
@@ -47,4 +65,5 @@ We used these "ring oscillator" codes from Neil:
 
 * [esp32C3 code](https://pub.pages.cba.mit.edu/ring/GPIO/ESP32/ring.ESP32C3.ino)
 
-* [samd21 code](https://pub.pages.cba.mit.edu/ring/GPIO/SAMD11C/ring.D11C.ino)
\ No newline at end of file
+* [samd21 code](https://pub.pages.cba.mit.edu/ring/GPIO/SAMD11C/ring.D11C.ino)
+