Liquid dispensing units

A method of manufacturing a soap dispenser, the method comprising:

• forming the soap dispenser, the soap dispenser including a pump, a motor, a first sensor, and an electronic processor;
• configuring the first sensor to generate a signal representing a distance between an object and the first sensor;
• configuring the electronic processor to check for signals generated by the first sensor;
• and
• configuring the electronic processor to generate a signal to the motor to dispense a volume of soap that varies depending on the distance between the object and the sensor.

A soap dispenser comprising:

• a housing;
• a fluid passage disposed in the housing, the fluid passage having an inlet and an outlet;
• a pump disposed in the housing, the pump having an opening disposed in a pump body, the opening in fluid communication with a removable cartridge, the removable cartridge configured to be separated from the housing and to contain a volume of soap and a power source in a single disposable unit;
• and
• a motor disposed in the housing, the motor configured to a drive the pump to encourage a flow of soap from the removable cartridge into the inlet and out of the outlet of the fluid passage.

A fluid cartridge for an electrical fluid dispenser, the cartridge comprising:

• a disposable housing configured to attach to a pump unit;
• a fluid reservoir;
• an engagement mechanism configured to removably attach the housing to a pump unit;
• and
• an indicator configured to indicate at least one characteristic of the cartridge to the pump unit.