Type hints + simple Pytest + higher precision serial

README.md

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+# HIL Tester for PER
+
+## Running
+
+- Code in `./TestBench` runs on the Arduino
+	- Basically it just reads commands over the serial port and either executs them or writes messages back over the serial port
+	- To flash it, use the Arduino IDE
+- Code in `./scripts` runs on your laptop
+	- It uses all the Python files
+	- Each file in `./scripts` can run a Pytest script to test some board on the car
+	- Do `./test.sh [filename]` to run the script, or no filename to run all of them
+		- (Note: have to run from the `./scripts` directory)
+- Make sure you correctly set `firmware_path` in `./hil_params.json` to the path of the primary PER firmware repo!
+
+## Notes
+
+### Input vs Output
+
+- `AI`/`DI` = inputs to hil (reads from the car/other board -> Arduino -> laptop/Python)
+- `AO`/`DO` = outputs from hil (writes from laptop/Python -> Arduino -> car/other board)