Abstract: A toner cartridge for an image forming device includes a body for holding toner and a flight. The flight contains magnetic particles and is configured to guide movement of a magnetic field sensor. The magnetic particles generate a magnetic field that the sensor reads. Other systems and methods are disclosed.

Abstract: A method of operating an I2C slave having an I2C clock pin and an I2C data pin is disclosed. The method includes (a) receiving a command via the I2C clock pin and the I2C data pin, (b) driving the I2C data pin to logic low for a first duration, (c) not driving the I2C data pin to logic low for a second duration, and (d) repeatingly alternating (b) and (c) until a termination event occurs. (b) and (c) are not synchronized to transitions of the I2C clock pin. Other methods and systems are disclosed.

Abstract: A toner cartridge for an image forming device includes a body for holding toner and a flight. The flight contains magnetic particles and is configured to guide movement of a magnetic field sensor. The magnetic particles generate a magnetic field that the sensor reads. Other systems and methods are disclosed.

Abstract: Systems and methods for authenticating printer supply items using revocation lists are disclosed. Revocation lists are updated using DNSSEC to communicate between a printer and a DNS name server. A domain name is created containing a printer supply item serial number, a message digest, and a message authentication code. The domain name is sent to the DNS name server, and the returned IP address is used to update a revocation list. Other systems and methods are disclosed.

Abstract: Systems and methods for authenticating printer supply items using revocation lists are disclosed. Revocation lists are updated using DNSSEC to communicate between a printer and a DNS name server. A domain name is created containing a printer supply item serial number, a message digest, and a message authentication code. The domain name is sent to the DNS name server, and the returned IP address is used to update a revocation list. Other systems and methods are disclosed.

Abstract: A helical physical unclonable function is disclosed. The helical physical unclonable function may be used to authenticate a supply item for an imaging device. Measurements of the magnetic field adjacent a helical flight are stored in a non-volatile memory to be used by an imaging device to authenticate the supply item. Other systems and methods are disclosed.

Abstract: A helical physical unclonable function is disclosed. The helical physical unclonable function may be used to authenticate a supply item for an imaging device. Measurements of the magnetic field above a helical flight are stored in a non-volatile memory to be used by an imaging device to authenticate the supply item. Other systems and methods are disclosed.

Abstract: Methods for manufacturing a supply item for an imaging device having a helical physical unclonable function are disclosed. The helical physical unclonable function may be used to authenticate a supply item for an imaging device. Measurements of the magnetic field above a helical flight are stored in a non-volatile memory to be used by an imaging device to authenticate the supply item. Other systems and methods are disclosed.

Abstract: A method of operating an I2C slave having an I2C clock pin and an I2C data pin is disclosed. The method includes (a) receiving a command via the I2C clock pin and the I2C data pin, (b) driving the I2C data pin to logic low for a first duration, (c) not driving the I2C data pin to logic low for a second duration, and (d) repeatingly alternating (b) and (c) until a termination event occurs. (b) and (c) are not synchronized to transitions of the I2C clock pin. Other methods and systems are disclosed.

Abstract: A capacitance measuring system, including: a calibration capacitor; first circuitry for sensing an input current at an input thereof and generating an output signal that is based upon a capacitance appearing at the input of the first circuitry; and multiplexer circuitry, coupled between the input of the first circuitry and a terminal of each of the capacitor to be measured and the calibration capacitor, for selectively coupling the terminal of each, one at a time, to the input of the first circuitry while the terminal not coupled to the input of the conversion circuitry is coupled to a ground reference; and controller circuitry for calculating a capacitance of the capacitor to be measured based upon the output signal of the first circuitry when the capacitor to be measured is coupled to the input thereof and upon the output signal of the first circuitry when the calibration capacitor is coupled to the input thereof.

Abstract: A lamp turns on a bright light when a sleeper's pulse races during a night terror. The night terror lamp communicates wirelessly with a heart-rate monitor worn by the sleeper. The bright light helps to wake the sleeper and helps to alert others that the sleeper is having a night terror so they can help the sleeper. Other devices and methods are disclosed.

Abstract: A method of operating an imaging device having a failed or failing media-full sensor determines whether or not a controller can trust the output signal received from the media-full sensor. A reduced power or intensity level is used to test the media-full sensor and, in particular, the light source to counter the dimming of the light source that occurs due to aging and electrical noise in the system. When the output signal of a photoreceptor is at or below a threshold value, the photo-receptor is considered to have not detected the light beam from the light source and the light beam is deemed not to have been detected even though the photo-receptor may be providing a lower level output signal. Thus, an output signal of the photo-receptor is not trusted and an indication that a media storage area is not full is provided and an imaging operation is carried out.

Abstract: A circuit and system for sensing a capacitance of a capacitive sensor disposed in a toner container of an electrophotographic imaging apparatus. The circuit and system may include an AC signal generator and conversion circuitry, coupled to the capacitive sensor, for detecting an AC current appearing on the capacitive sensor and converting the detected AC current to a substantially DC voltage, relative to a local ground, the local ground serving as a ground reference for the conversion circuitry. The AC signal generator is coupled between the local ground and a system ground. Physically separating the AC signal generator from the capacitive sensor allows for parts of the capacitive sensor to be used to perform other functions in the toner container.

Abstract: A method of operating an imaging device having a failed or failing media-full sensor determines whether or not a controller can trust the output signal received from the media-full sensor. A reduced power or intensity level is used to test the media-full sensor and, in particular, the light source to counter the dimming of the light source that occurs due to aging and electrical noise in the system. When the output signal of a photoreceptor is at or below a threshold value, the photo-receptor is considered to have not detected the light beam from the light source and the light beam is deemed not to have been detected even though the photo-receptor may be providing a lower level output signal. Thus, an output signal of the photo-receptor is not trusted and an indication that a media storage area is not full is provided and an imaging operation is carried out.

Abstract: A replaceable unit for an electrophotographic image forming device according to one example embodiment includes a housing having a reservoir for storing a quantity of toner. An insertion alignment guide is positioned on the housing. The insertion alignment guide has a magnet for detection by a magnetic sensor in the image forming device.

Abstract: A capacitance measuring system, including: a calibration capacitor; first circuitry for sensing an input current at an input thereof and generating an output signal that is based upon a capacitance appearing at the input of the first circuitry; and multiplexer circuitry, coupled between the input of the first circuitry and a terminal of each of the capacitor to be measured and the calibration capacitor, for selectively coupling the terminal of each, one at a time, to the input of the first circuitry while the terminal not coupled to the input of the conversion circuitry is coupled to a ground reference; and controller circuitry for calculating a capacitance of the capacitor to be measured based upon the output signal of the first circuitry when the capacitor to be measured is coupled to the input thereof and upon the output signal of the first circuitry when the calibration capacitor is coupled to the input thereof.

Abstract: A circuit and system for sensing a capacitance of a capacitive sensor disposed in a toner container of an electrophotographic imaging apparatus. The circuit and system may include an AC signal generator and conversion circuitry, coupled to the capacitive sensor, for detecting an AC current appearing on the capacitive sensor and converting the detected AC current to a substantially DC voltage, relative to a local ground, the local ground serving as a ground reference for the conversion circuitry. The AC signal generator is coupled between the local ground and a system ground. Physically separating the AC signal generator from the capacitive sensor allows for parts of the capacitive sensor to be used to perform other functions in the toner container.

Abstract: A method of generating light is disclosed. The method includes generating steady light during a first period. The method also includes generating varying light during a second period, the second period is less than one quarter of the first period, and the varying light is in the form of breath cues. Other methods and devices are disclosed.

Abstract: An inkjet printhead. The inkjet printhead includes a temperature-sensing resistor with a low voltage end which is connected to a ground structure that at least partially encloses the temperature sensing resistor.

Abstract: Printer (1) is provided with a mode to edit and print forms without reference to or interruption of a host computer and with immediate printing of one or more of the forms. Page data for the forms is preferably stored in flash memory (21) in a high level printer language. Preferably, at initiation of the forms mode at least the first listed document is immediately prepared by the control data processor (17) of the printer in bit mapped form for printing. Documents can be listed on the control panel by name for ready selection for printing.