Abstract: A stress test apparatus used for testing torque between a top portion and a bottom portion of an electronic device. The stress test apparatus includes a console, a rotary table, a lifting pole, a traversing arm, a securing fixture and torque sensor. The rotary table is located on the console for retaining the bottom portion. The lifting pole extends from the console. The traversing arm is gearingly engaged to the lifting pole to adjust a height of the traversing arm relative to the console. The securing fixture clasps the top portion of the electronic device. The torque sensor is fixed between the traversing arm and the securing fixture. The bottom portion is rotated relative to the top portion with rotation of the rotary table, and the torque sensor is capable of detecting needed for rotating the top portion relative to the bottom portion.

Abstract: A step motor driving apparatus includes a micro control unit (MCU), a pulse generator, a first step motor driver, a second step motor driver, and a communication port. The first step motor driver is configured for driving a first step motor and connected to the MCU. The second step motor driver is configured for driving a second step motor and connected to the MCU. The MCU is connected to the second step motor driver via the pulse generator. The pulse generator is configured to supply pulse signals to the second step motor driver. The communication port is connected to the MCU. The MCU receives a corresponding command from an external control apparatus via the communication port. The MCU selectively controls the first step motor driver to drive the first step motor or controls the second step motor driver to drive the second step motor according to the command.

Abstract: A step motor driving apparatus includes a micro control unit (MCU), a pulse generator, a first step motor driver, a second step motor driver, and a communication port. The first step motor driver is configured for driving a first step motor and connected to the MCU. The second step motor driver is configured for driving a second step motor and connected to the MCU. The MCU is connected to the second step motor driver via the pulse generator. The pulse generator is configured to supply pulse signals to the second step motor driver. The communication port is connected to the MCU. The MCU receives a corresponding command from an external control apparatus via the communication port. The MCU selectively controls the first step motor driver to drive the first step motor or controls the second step motor driver to drive the second step motor according to the command.