feat(hw): Adds PV module voltage and current sensing (#3)

* Adds first draft of pv-panel voltage and current sensing.

* Adds specific values for sense resistors.

* Set anti-aliasing cutoff frequency to 4.8kHz.
Adds documentation.

* Adds ADE7912

* Tidy up schematics. Adds sheet symbols to root.

* updates symbols from library.

* chore: 🤖 KiCad export

---------

Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>

hardware/KiCad/OpenMI/OpenMI.kicad_pro

@@ -358,6 +358,10 @@
     [
       "3c07917d-0dac-4b60-ba30-69189b5da8a3",
       "Buck Converter"
+    ],
+    [
+      "a47e4c49-5b9d-48c7-be94-747a65ca7916",
+      "PV-Sensing"
     ]
   ],
   "text_variables": {}

hardware/KiCad/OpenMI/OpenMI.kicad_sch

@@ -176,6 +176,71 @@
     )
   )
 
+  (sheet (at 54.61 78.74) (size 19.05 24.13) (fields_autoplaced)
+    (stroke (width 0.1524) (type solid))
+    (fill (color 0 0 0 0.0000))
+    (uuid a47e4c49-5b9d-48c7-be94-747a65ca7916)
+    (property "Sheetname" "PV-Sensing" (at 54.61 78.0284 0)
+      (effects (font (size 1.27 1.27)) (justify left bottom))
+    )
+    (property "Sheetfile" "PV-Sensing.kicad_sch" (at 54.61 103.4546 0)
+      (effects (font (size 1.27 1.27)) (justify left top))
+    )
+    (pin "V_{M,IN}" input (at 54.61 83.82 180)
+      (effects (font (size 1.27 1.27)) (justify left))
+      (uuid b12c2b6c-608e-4e98-959e-2aac6dca4944)
+    )
+    (pin "V_{P,OUT}" output (at 73.66 81.28 0)
+      (effects (font (size 1.27 1.27)) (justify right))
+      (uuid b6eea231-867e-473b-aa98-6543752ed7b5)
+    )
+    (pin "V_{M,OUT}" output (at 73.66 83.82 0)
+      (effects (font (size 1.27 1.27)) (justify right))
+      (uuid df64f34d-fca0-4eb2-867b-16bb2af36620)
+    )
+    (pin "V_{P,IN}" input (at 54.61 81.28 180)
+      (effects (font (size 1.27 1.27)) (justify left))
+      (uuid 66f71f9e-4a9e-4d1d-a177-8f27eef10ed5)
+    )
+    (pin "GND" input (at 54.61 99.06 180)
+      (effects (font (size 1.27 1.27)) (justify left))
+      (uuid 975cf625-38e0-4f82-b11c-668119cf94e4)
+    )
+    (pin "MISO" output (at 73.66 99.06 0)
+      (effects (font (size 1.27 1.27)) (justify right))
+      (uuid 1d970d94-f8e4-4539-ae62-9bc944c14500)
+    )
+    (pin "VDD" input (at 54.61 96.52 180)
+      (effects (font (size 1.27 1.27)) (justify left))
+      (uuid e49d0c3d-af4e-442a-ba4c-6d44db62234c)
+    )
+    (pin "~{DREADY}" output (at 73.66 88.9 0)
+      (effects (font (size 1.27 1.27)) (justify right))
+      (uuid 5bdaace5-5e7e-4b9a-aa06-27b6b7333cde)
+    )
+    (pin "~{CS}" input (at 73.66 91.44 0)
+      (effects (font (size 1.27 1.27)) (justify right))
+      (uuid d80b818b-be3d-4cff-95de-93766dff8740)
+    )
+    (pin "MOSI" input (at 73.66 96.52 0)
+      (effects (font (size 1.27 1.27)) (justify right))
+      (uuid 54989252-8ef3-4b30-a8ea-69532381fa98)
+    )
+    (pin "EN" input (at 54.61 93.98 180)
+      (effects (font (size 1.27 1.27)) (justify left))
+      (uuid 8787cdf0-c98b-46ed-b477-3530ba2e9c68)
+    )
+    (pin "SCLK" input (at 73.66 93.98 0)
+      (effects (font (size 1.27 1.27)) (justify right))
+      (uuid da07aae9-f1f8-4e77-a3f4-6b50934127cb)
+    )
+    (instances
+      (project "OpenMI"
+        (path "/2d959e19-1572-42a0-a8fd-da8463ad4e66" (page "8"))
+      )
+    )
+  )
+
   (sheet (at 147.32 78.74) (size 19.05 17.78) (fields_autoplaced)
     (stroke (width 0.1524) (type solid))
     (fill (color 0 0 0 0.0000))