Abstract: The present invention relates to a home ice cream machine comprising a motor, a scratching card, a machine body, a refrigerant is equipped in the interlayer of the machine body, the scratching card is coupled with the motor and inserts into the machine body, the scratching card rotates in the machine body under the driving of the motor, the machine further comprises a MCU, the control output end of the MCU is attached to the input end of the motor, a corresponding time threshold value of ice cream production is preset inside of the MCU, when the time to switch on the motor reaches the preset threshold value, the MCIJ outputs a hold out signal to the motor.

Abstract: An electromechanical timer includes a case (1), an electric motor (3) and a unidirectional transmission device (4) disposed in the case. The electric motor is engaged with the unidirectional transmission device, the unidirectional transmission device is connected with a ratchet (5) setting voltages, and the ratchet is fixed with a handle (2). Voltages corresponding to the handle at different rotating positions are collected by a voltage acquisition unit. The voltage acquisition unit outputs the voltages to a control unit. The control unit is connected with the electric motor. The unidirectional transmission device and the ratchet setting voltages realize the random timing at any position.