Update readme with board v1.1 changed and details

README.md

@@ -8,30 +8,51 @@ This project allows you to use [BlueSCSI](https://github.com/erichelgeson/BlueSC
 
 # Board Versions and Gerber Files
 
-## version 1.1(v1.1/gerber) (April 2021) - current
+## [version 1.1](v1.1/) (April 2021) - current
 
-Under development.
+v1.1 sent to fab today (Monday, Apr 5), hope to have to have it back by the weekend for testing.
 
-## [version 1.0](v1.0/gerber) (March 2021) - not recommended, modify before using
+Changes:
+
+* Connect `RETURN` on 40-pin SCSI connector with signal ground
+* STM32 +5 is connected to `TERMPWR` by default, via breakable jumper pad
+* Separate jumpers provided for powering via `TERMPWR` or `MOTORPWR`
+  - *MOTORPWR* is a separate +5v provided to run the drive motor and actuator
+  - This change will be helpful for debugging power issues where *MOTORPWR* appears to be inconsistent
+* Mounting hole locations adjusted so they match an actual drive
+* Activity LED (`LED_BUILTIN`) broken-out if you want to have an external LED
+  - You can use the cathode (negative) pin of the LED footprint to monitor drive activity from an external device directly
+* Traces and resistor packs are moved farther away from mounting holes to avoid potential shorts
+* Increased `TERMPWR` trace width
+* Back silkscreen marks location of the key pin (17) within the 40-pin connector
+* Moved legends for J1, J2 and J8 so they are next to pin 1 on their respective connectors
+* Corners rounded more
+* Shorten board by about 5mm
+  - This is the shortest practical length to maintain all four screw holes
+* Numerous changes to the routing of traces
+
+![3D rendering of bluescsi_pb v1.1 board ](images/pcb_v1.1_render.jpg)
+
+## [version 1.0](v1.0/) (March 2021) - not recommended, modify before using
 
 First version. 50-pin-SCSI, termination and SD card worked first time, right out of the gate. However, problems:
 
 * The screw holes are slightly too far in from edges
 * `RETURN` lines are not connected to signal ground
-* Can only power STM32 from `MOTOR +5` *or* USB, no option to power it from from `TERMPWR`
-* No option to disconnect STM32 from J1 power and use USB power alone
+* Can only power STM32 from `MOTORPWR` *or* USB, no option to power it from from `TERMPWR` alone
+* No option to disconnect STM32 from *both* `TERMPWR` and `MOTORPWR` power and use USB power alone without backfeeding
 
 If you choose to use this board design, please do the following:
-* break the `MOTOR +5` trace, as seen in [this image](images/j2.jpg)
-* Solder a wire from any ground pin to one of the `RETURN` pins (number 3, 4, 37 or 38) of `J1`. These are 1 column in from each edge, and and connected together. They are next to the `MOTOR +5` pins, the trace you broke above.
+* break the `MOTORPWR` trace, as seen in [this image](images/j2.jpg)
+* Solder a wire from any ground pin to one of the `RETURN` pins (number 3, 4, 37 or 38) of `J1`. These are 1 column in from each edge, and and connected together. They are next to the `MOTORPWR` pins, the trace you broke above.
 * Ensure J9 ("bridge +5v and term power") is always shorted/jumped
 
-Why the modifications? the `MOTOR +5` pins do not appear to be working the way I expect. The power was being disconnected at unexpected times and I could not see a pattern. Maybe it is a power-saving feature? Until I figure it out and update the board design, I recommend you power the device from `TERMPWR` as usual.
-
-# Board
+Why the modifications? the `MOTORPWR` pins do not appear to be working the way I expect. The power was being disconnected at unexpected times and I could not see a pattern. Maybe it is a power-saving feature? Until I figure it out and update the board design, I recommend you power the device from `TERMPWR` as usual.
 
 ![3D rendering of bluescsi_pb v1.0 board ](images/pcb_v1.0_render.jpg)
 
+# Board Tour
+
 ## 40-pin connector (J1)
 
 This is a 2.0mm, two-row, right angle header connector. It connects to the ribbon cable inside the PowerBook. Most ribbon cables have a "key pin" located at pin 17. If this is the case, you will need to break that pin off the connector on your board. The side the key is located on is indicated by the "[" symbol.