Update README.md

tstorm32 group buy stuff/README.md

@@ -5,7 +5,7 @@ This folder contains the files, which were used in the T-STorM32 group buy on rc
 
 - STorM32 board v3.32m
 - NT Imu module v2.11
-- NT Motor-Encoder module v2.51e
+- NT Motor-Encoder module v2.51E
 
 Corresponding thread at rcgroups: https://www.rcgroups.com/forums/showthread.php?3027947-T-Storm-32-prototype-group-buy
 
@@ -14,3 +14,10 @@ A summary of using these materials for building a T-STorM32 gimbal is found here
 Two small issues have been found with the Eagle .brd and BOM files for the NT Motor Encoder module v2.51:
 * The BOM lists the TLE5012B E3005 (TLE5012BE3005XUMA1) instead of the recommended TLE5012B E1000 encoder chip.
 * The Eagle .brd file shows the values for the parts C12 and R1 in confusing locations.
+
+For the Eagle .brd files hold these relations to the original Eagle files:
+* 'STorM32 NT BGC v332m sz2u.brd' is different to 'STorM32 NT BGC v330m.brd'. The main change is using SM06B-SRSS connectors instead of SM07B-SRSS connectors.
+* 'STorM32 NT imu v211 mini.brd' is identical to 'STorM32 NT imu v211 mini-mpu9250.brd'.
+* 'T-STorM32 motor v251E-sq (Encoder).brd' is identical to 'T STorM32 motor v251E-sq.brd'.
+* 'T-STorM32 motor v251E-sq (Without Encoder).brd' is identical to 'T STorM32 motor v251E-sq.brd'.
+