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+## `board_module`
+
+Wideband O2 sensor controller on a postage stamp. Contains all the analog and digital control logic to handle a Bosch LSU 4.2, 4.9, or ADV sensor.
+
+Intended to either be mounted on an ECU as a module, or on `board_carrier` to run standalone.
+
+## `board_carrier`
+
+Stacks under `board_module`, has 5v regulator, CAN tranceiver, etc so that the module can exist standlone.
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+This folder is old hardware preserved for posterity.
+
+## `board_dev`
+
+Developmend board used to prove out principle before the F0 module was developed.
+
+## `board_fw_tool`
+
+Used to connect USB to the F0 module before the debug header was replaced with Tag Connect TC2030.