Abstract: A warning device is mounted on a valve including a valve body, a valve seat and a valve stem. The warning device comprises a base, a shaft, a sensing module, a control module and a warning module. The base is connected to the valve body. The shaft has a shaft body and a first sensing member. A profile of a cross section of the shaft being passed through by the first sensing member is asymmetric along at least a radial direction. The sensing module has a second sensing member received in the base and corresponded to the first sensing member to detect changes in position of the first sensing member and generate a sensing signal accordingly. The control module receives the sensing signal generated by the sensing module and calculates a rotation data accordingly. The warning module generates a warning signal according to the rotation data from the control module.

Abstract: A smart lock of a bicycle includes a bicycle locking apparatus and a dock locking apparatus. The bicycle locking apparatus works with a key to lock the bicycle without dock, and the dock locking apparatus works with a dock to lock the bicycle to the dock. The bicycle locking apparatus includes a gear, a locking member, and a driving module. The locking member has a locking tooth portion, the driving module moves the locking member to engage and disengage the locking tooth portion of the locking member with an engaging portion of the key. The dock locking apparatus has a locking latch and a stop member. The driving module moves the locking member to let the stop member against or away from the locking latch to lock or unlock the bicycle to the dock.

Abstract: An apparatus, which is connected to a bicycle, includes a case having a chamber, a main device received in the chamber of the case, a locking member connected to the main device, a lid connected to the case to seal the chamber, wherein the lid has a bore and the bore is received in the chamber of the case, and a transceiver received in the chamber of the case and electrically connected to the locking member, wherein the transceiver receives a signal to control the locking member accordingly. The apparatus can be opened by the outside signal transmitted to the transceiver only.

Abstract: A bicycle rental system includes a plurality of rental bicycles, each of which has a locking apparatus, a controlling apparatus, and a parking locker. The locking apparatus is operated to lock the rental bicycle, and the parking locker is able to engage and lock a dock locker of the dock. The controlling apparatus transmits signals to a control system, and receives signals from the control system through a network. The bicycle rental system may return the rental bicycle with or without the docks, and may rent the rental bicycle by a mobile device or a tag device.

Abstract: A door lock management control system includes a door controller, a main controller, and a near field communication device. The main controller includes one or both of a key tag and a near field communication controllable device. A door access APP is installed in the near field communication device and obtains an access identification number. The access identification number is stored in a memory of the near field communication device. A door access APP is installed in the near field communication controllable device and obtains a management identification number. The door controller can be operated to grant door lock management authority to one or both of the key tag and the near field communication controllable device. Door access authority of the near field communication device can be granted or cancelled by either of the key tag and the near field communication controllable device through near field communication.