A logic circuitry package for a replaceable print apparatus component includes an interface to communicate with a print apparatus logic circuit and at least one logic circuit to transmit, via the interface, a limit parameter and a count threshold parameter. The logic circuit is to receive, via the interface, initial requests to read sensor IDs with the component connected to the apparatus and the apparatus not pneumatically actuating the component. The logic circuit is to transmit, via the interface, a resting state digital value in response to each initial request. The logic circuit is to receive, via the interface, further requests to read the sensor IDs with the component connected to the apparatus and the apparatus pneumatically actuating the component. The logic circuit is to transmit, via the interface, a further digital value in response to each further request.

A logic circuitry package for a replaceable print apparatus component includes an interface to communicate with a print apparatus logic circuit, and at least one logic circuit to receive, via the interface, requests corresponding to different sensor IDs with the component connected to the apparatus. The logic circuit is to transmit, via the interface, a digital value in response to each request. The digital values corresponding to the different sensor IDs are distinct.

A logic circuitry package for a replaceable print apparatus component includes an interface to communicate with a print apparatus logic circuit and at least one logic circuit. The at least one logic circuit includes a memory storing at least one temperature calculation parameter. The at least one logic circuit is configured to receive, via the interface, a first request to read the at least one temperature calculation parameter; and transmit, via the interface, the at least one temperature calculation parameter in response to the first request. The at least one logic circuit is configured to receive, via the interface, a second request corresponding to a sensor ID; and transmit, via the interface, a digital value in response to the second request. The digital value adjusted based on the at least one temperature calculation parameter corresponds to an absolute temperature of the print apparatus component.

Operating a fluid delivering system in a printer, wherein the fluid delivering system comprises a fluid supply including a fluid bag which contains a fluid to be delivered to a fluid delivering tube connected to a printhead, and a closed pressurizing volume which surrounds the fluid bag to expel fluid from the fluid bag to the fluid delivering tube when applying pressure from a pressurizing system to the pressurizing volume, wherein pressure in the pressurizing system relative to atmosphere is measured by a first sensor, and wherein a second sensor provides an output signal which indicates a pressure difference between the pressurizing system and the fluid delivering tube, comprising disconnecting the pressurizing volume of the fluid supply from the pressurizing system, providing a connection of the pressurizing volume to atmosphere to transmit atmospheric pressure to the fluid, generating pressure in the pressurizing system, performing measurements of the pressure in the pressurizing system relative to atmosphere by the first sensor, and calibrating the second sensor by the measurements of the first sensor.

A sensor circuit for a replaceable print material container to be connected to a host print apparatus logic circuit comprising a first sensor to detect a pneumatic stimulus or pressurization applied by a print apparatus, and an interface including contact pads to connect to a voltage and/or data source of the print apparatus logic circuit, the sensor circuit configured to output signals conditioned by the pneumatic stimulus or pressurization via the contact pads.

A sensor circuit for a replaceable print material container to be connected to a host print apparatus logic circuit comprising a first sensor to detect a pneumatic stimulus or pressurization applied by a print apparatus, and an interface including contact pads to connect to a voltage and/or data source of the print apparatus logic circuit, the sensor circuit configured to output signals conditioned by the pneumatic stimulus or pressurization via the contact pads.

An example printhead assembly includes a housing, nozzles and a collapsible container within the housing to supply ink to the nozzles. The collapsible container includes a top wall, a bottom wall, first and second side walls that form an interior and a spring assembly within the interior. The first flexible wall includes a first amount of excess material. The second flexible wall includes a second amount of excess material less than the first amount of excess material such that motion of the first flexible wall of the collapsible container is constrained against movement to a lesser extent as compared to the second flexible wall. The first flexible wall faces the sensor. A sensor assembly is coupled to the housing and includes a sensor to provide a sensor signal indicating the amount of ink within the collapsible container.

A liquid cartridge includes: a cartridge body accommodating a reservoir; a liquid-supply part; a movable member movably supported by the cartridge body; an urging member provided on the movable member; and a contact member provided at a surface of the reservoir. The movable member includes a detected part movable from a first position, to a second position rearward of the first position, and to a third position rearward of the second position, the detected part at the first position and at the second position being positioned higher relative to the cartridge body. The urging member is resiliently deformable, the urging member in a deformed state being deformed to urge the detected part toward the third position. The contact member can contact the movable member, the contact member in contact with the movable member restricting the detected part at the second position from moving to the third position.

One example of a system includes a bulk ink assembly, a printhead assembly, a valve, and a controller. The bulk ink assembly receives a bulk ink supply. The printhead assembly includes nozzles to eject ink drops, a collapsible container to supply ink to the nozzles, and a sensor to provide a sensor signal indicating the amount of ink within the collapsible container. The valve supplies ink to the collapsible container from the bulk ink assembly in response to a control signal. The controller provides the control signal based on the sensor signal to regulate the amount of ink in the collapsible container and to provide an out of ink signal based on the sensor signal indicating the bulk ink supply is effectively empty.

An example printhead assembly includes a housing, nozzles and a collapsible container within the housing to supply ink to the nozzles. The collapsible container includes a top wall, a bottom wall, first and second side walls that form an interior and a spring assembly within the interior. The first flexible wall includes a first amount of excess material. The second flexible wall includes a second amount of excess material less than the first amount of excess material such that motion of the first flexible wall of the collapsible container is constrained against movement to a lesser extent as compared to the second flexible wall. The first flexible wall faces the sensor. A sensor assembly is coupled to the housing and includes a sensor to provide a sensor signal indicating the amount of ink within the collapsible container.