Updated hw directory README

hw/README.md

@@ -1,14 +1,10 @@
-# AmpliPi Hardware Diagrams
+# AmpliPi Hardware Info
+
 This directory contains hardware documents for AmpliPi as well as testing
 software used to verify hardware functionality.
 
-## Schematics
-Schematic diagrams for all the boards in an AmpliPi Main Unit or Exander
-are available in the [sch](sch) directory.
-See [hw_releases.md](sch/hw_releases.md) for the configuration of board
-revisions in each hardware release.
-
 ## Diagrams
+
 Hardware diagrams documenting AmpliPi hardware and signal flow at a
 higher-level are available in the [diagrams](diagrams) directory.
 
@@ -18,7 +14,41 @@ The AmpliPi Controller's boards are outlined in the following diagram:
 The AmpliPi Zone Expander's boards are outlined in the following diagram:
 ![Zone Expander Board Diagram](diagrams/expander_boards_diagram.drawio.svg)
 
+## Schematics
+
+Schematic diagrams for all the boards in an AmpliPro Main Unit, Expanders,
+and Streamers are available in the [sch](sch) directory.
+See [hw_releases.md](sch/hw_releases.md) for the configuration of board
+revisions in each hardware release.
+
 ## Tests
+
 The tests in the [tests](tests) directory are used by MicroNova to
 perform hardware verification of units.
 Many of the tests can be run without extra test equipment.
+
+The set of tests run during checkout are documented with test sheets.
+Each unit type has its own set of tests:
+
+* [Main Units (AP1_S4Z6)](test_ap1_s4z6.tex)
+* [Zone Expanders (AP1_Z6)](test_ap1_z6.tex)
+* [Streamers (AP1_S4)](TESTING_STREAMER.md)
+
+And individual boards have their own set of tests
+before being put into a final assembly:
+
+* [BOARD_TESTS.md](BOARD_TESTS.md)
+
+To generate a PDF from the LaTeX files, first install `texlive` with
+
+```sh
+sudo apt install texlive-latex-base texlive-latex-extra
+```
+
+then from the same directory as the `.tex` file run
+
+```sh
+pdflatex FILE.tex
+```
+
+replacing FILE.tex with the LaTeX file you want to build.