The motor shield holder receives a Node Motor Shield. A NodeMCU plugs into the motor shield.
Hardware sources:
The battery holder receives another battery holder for 4 AA batteries.
Hardware sources:
The power plug is used to connect the batteries to the motor shield. Standard male Dupont pins are crimped to the wire ends of the battery holder and pushed into the power plug. A drop of Crazy Glue is used to keep the pins from coming out. Pay close attention to wire polarity.
Hardware sources:
The motor cap snaps on the top of the motor holder after a motor and wires are inserted into the motor holder.
Download the source code to drive BERT at our github page.