How to connect a BTT-MOT_EXP to an SKR v1.4


BigTreeTech released the BTT-MOT-EXP. It is an adapter that would ordinarily allow 3 more extra drivers to be added to an SKR v1.4. To allow a WiFi or SBC connection, some of those pins required. Luckily though, TeamGloomy have produced an adapter to allow the BTT-MOT-EXP to be connected and for 2 out of the 3 driver connections to be used.

BTT-MOT-EXP for WiFi Adapters
BTT-MOT-EXP for WiFi Adapters
BTT-MOT-EXP for older WiFi Adapters
BTT-MOT-EXP for older WiFi Adapters
BTT-MOT-EXP for SBC Adapters
BTT-MOT-EXP for SBC Adapters

Connecting the boards

A single 10-pin IDC cable is required between the WiFi/adaptor board and the board connected to the BTT EXP-MOT V1.0.
12/24v power should be connected to the BTT-MOT-EXP to power the drivers.
If using the drivers in UART mode, a jumper should be added to the pins underneath the driver as normal.

SKR 1.4 Board.txt configuration

Please edit the stepper.numSmartDrivers in the board.txt file to 7 (assuming you have TMC2208, TMC2009, TMC2225 or TMC2226 drivers in all other sockets).

stepper.numSmartDrivers = 7

Please add the following lines to the board.txt.

stepper.enablePins = { 2.1, 2.8, 0.21, 2.12, 1.16, 1.18, 1.23 }
stepper.stepPins = { 2.2, 0.19, 0.22, 2.13, 1.15, 1.21, 1.20 }
stepper.directionPins = { 2.6, 0.20, 2.11, 0.11, 1.14, 1.19, 1.22 }
stepper.TmcUartPins = { 1.10, 1.9, 1.8, 1.4, 1.1, 3.25, 3.26 }

Config.g Modification

The two added drivers would become driver 6 and driver 7.

M569 P5 S0
M569 P6 S0