update journal

eng_journal.md

+### 06/27/2019
+- Compile `OldRoCo` [repo](https://git.uclalemur.com/mehtank/oldroco)
+  - Record of modification:
+    - ++line 8 of `vstart.sh`
+    - --> `pip install -r requirements.txt --user`
+- Export `paperbot` dxf file : `graph-silhouette.dxf` to `OnShape`
+  - Record of Tips:
+    - Onshape does not read dxf file as its own saved unit. Manual settings needed when import.
+    - [!onshape_dxf_unit]()
+- Draw circuit diagram as CAD on `Onshape`
+  - Multiple connection approaches:
+    - `Cross` shape of `0.039 in`
+    - `Cross` shape of `0.049 in`
+    - `Octangular` shape of `0.049 in`
+    - [!connection_approaches]()
+  - Note and issue:
+   - `Octangular` shape is the best connection approach so far, but none of approach has stable conductivity. More research is needed.
+    - Scratches can be made easily when attaching microcontroller to the sheet. Potential disconnection may occur due to such scratches on metal layer.
+- Export 2D CAD drawing with PCB to SVG for silhouette cameo 
+  - Record of Tips:
+    - `OnShape` unit need to be consisted with unit setting in `Inkscape` (default: mm)
+  - Plugin `Inkscape-silhouette` cannot take multiple types of trace for cutting. 
+    - Different trace (especially cut and etching) need to be sent separately. Use `coordinate tool` of `Inkscape` to ensure separated cuts have same origin. 
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