A system and method for performing a self-testing a piezo sounder using a feedback pin while being driven by an ultra-sonic frequency. A method includes operating a sounder device in a test mode, the sounder device is operated in an inaudible frequency range during the test mode and detecting a feedback response voltage. The method includes comparing the feedback response voltage to a reference voltage and providing an indication of a failure mode based at least in part on the feedback response voltage.

The present disclosure generally relates to the field of fire alarms. The teachings thereof may be embodied in a strobe notification appliance having: a boost circuit connected to an input voltage; an energy storage circuit charged by the boost circuit; a drive circuit generating a drive current; an LED circuit with at least one LED element; a first sampling circuit collecting an overall voltage drop of all the LED elements; and a control circuit configured to adjust the drive circuit to supply a working current during an alarming stage and supply a detection current during a detection stage. The detection current is lower than the working current and thereby light energy produced by the LED elements during the detection stage is lower than alarming light energy produced during the alarming stage. During the detection stage, the control circuit determines whether the LED circuit works normally based on the collected overall voltage drop.

The present disclosure generally relates to the field of fire alarms. The teachings thereof may be embodied in a strobe notification appliance having: a boost circuit connected to an input voltage; an energy storage circuit charged by the boost circuit; a drive circuit generating a drive current; an LED circuit with at least one LED element; a first sampling circuit collecting an overall voltage drop of all the LED elements; and a control circuit configured to adjust the drive circuit to supply a working current during an alarming stage and supply a detection current during a detection stage. The detection current is lower than the working current and thereby light energy produced by the LED elements during the detection stage is lower than alarming light energy produced during the alarming stage. During the detection stage, the control circuit determines whether the LED circuit works normally based on the collected overall voltage drop.

An audio riser active electrical supervision system includes a high-voltage audio alert system connected to a riser circuit. The high-voltage audio alert system disconnects a high-voltage analog signal from the riser circuit when the audio riser active electrical supervision system operates in a standby mode, and connects the high-voltage analog signal to the riser circuit when the audio riser active electrical supervision system operates in an active alert mode. A plurality of isolator modules operate in a closed state that connects a circuit node to the riser circuit and an open state that disconnects the respective circuit node from the riser circuit. A riser supervision circuit is connected to at least one isolator module to detect a circuit fault on the riser circuit when the audio riser active electrical supervision system operates in the standby mode and the active alert mode.

An audio riser active electrical supervision system includes a high-voltage audio alert system connected to a riser circuit. The high-voltage audio alert system disconnects a high-voltage analog signal from the riser circuit when the audio riser active electrical supervision system operates in a standby mode, and connects the high-voltage analog signal to the riser circuit when the audio riser active electrical supervision system operates in an active alert mode. A plurality of isolator modules operate in a closed state that connects a circuit node to the riser circuit and an open state that disconnects the respective circuit node from the riser circuit. A riser supervision circuit is connected to at least one isolator module to detect a circuit fault on the riser circuit when the audio riser active electrical supervision system operates in the standby mode and the active alert mode.

A control panel is used to monitor events within a security system or other automation system. In the event an intruder enters a physical location, the intruder may attempt to damage the control panel to disrupt its operation. One or more sensors of the control panel may detect disruption in the operation of the control panel. Example sensors may detect an impact force, sudden acceleration, removal from a mounted location, or disruption of communication with an input/output element, such as a display device. When an event is detected at the control panel itself, the control panel can send a signal to a remote service provider, and the remote service provider can follow-up with the customer. The control panel and/or remote service provider may also determine when the control panel loses partial or complete power loss to identify the disruption as a potential crash-and-smash entry.

A control panel is used to monitor events within a security system or other automation system. In the event an intruder enters a physical location, the intruder may attempt to damage the control panel to disrupt its operation. One or more sensors of the control panel may detect disruption in the operation of the control panel. Example sensors may detect an impact force, sudden acceleration, removal from a mounted location, or disruption of communication with an input/output element, such as a display device. When an event is detected at the control panel itself, the control panel can send a signal to a remote service provider, and the remote service provider can follow-up with the customer. The control panel and/or remote service provider may also determine when the control panel loses partial or complete power loss to identify the disruption as a potential crash-and-smash entry.

A doorbell system and a doorbell control device are provided. The doorbell system includes a doorbell control device, a transformer, and a doorbell interface device. The doorbell control device has a first pin, a second pin, and a third pin. The doorbell control device includes a speaker unit and a control unit. The control unit is configured to control whether or not the speaker unit produces sound according to a current or a voltage of the second pin. The first pin is coupled to the second pin. The transformer outputs an AC voltage to the first pin and the third pin of the doorbell control device. The doorbell interface device is coupled to the second pin and the third pin of the doorbell control device.

A LED controller device that regulates one or more light systems affixed to a vehicle access gate. The controller receives inputs from one or more sources and actuates one or more light systems in response to particular signals, or triggers. The controller also monitors and records usage of the light system and may also record usage of other devices acting in concert with the light systems and/or an access gate. A software configuration tool is used to prepare a gate operation profile that identifies triggering events and the actions the controller takes upon the occurrence of the triggering events. That gate operation profile is flashed onto the controller's CPU. The controller may be contacted and controlled remotely or locally.

The disclosure relates to an alarm system comprising a plurality of detectors, each configured to detect an event in an environment and to emit an event detection signal, and a plurality of alarm signal emitters, each configured to emit at least one alarm signal in case of the detection of an event, the detectors and the emitters being linked to one another, wherein each of the emitters is configured to emit a plurality of distinct alarm signals. In case of the detection of an event by a first detector, a first identifier is assigned to at least one first emitter, the closest to the first detector out of the plurality of emitters, and an alarm generation instruction is transmitted to the first emitter with the first identifier, to activate the first emitter with a first alarm signal which is a function of the first identifier.