Exclusive dual-gated dispenser

A method of operating a dispensing device, comprising:

• adjusting an adjustable-volume measuring chamber of the dispensing device to a desired volume, wherein the dispensing device comprises:
• a feeder portion configured to couple with a reservoir portion storing a material to be dispensed and to receive the material from the reservoir portion;
• a first rotatable gate disposed at an end of the feeder portion opposite the reservoir portion, the first rotatable gate rotatable between an open position that permits flow of the material to be dispensed out of the reservoir portion, and a closed position that prevents flow of the material to be dispensed out of the reservoir portion;
• the adjustable-volume measuring chamber disposed at an outlet side of the first rotatable gate, the adjustable-volume measuring chamber configured to receive material to be dispensed, the adjustable-volume measuring chamber being adjustable to change a volume of material that can be received;
• and
• a second rotatable gate disposed at an end of the adjustable-volume measuring chamber opposite the first rotatable gate, the second rotatable gate rotatable between an open position that permits flow of the material to be dispensed out of the adjustable-volume measuring chamber, and a closed position that prevents flow of the material to be dispensed out of the adjustable-volume measuring chamber,
• rotating the adjustable-volume measuring chamber to a first position to fill the adjustable-volume measuring chamber with the desired volume of material to be dispensed, wherein rotation of the adjustable-volume measuring chamber causes rotation of both the first rotatable gate and the second rotatable gate, and wherein in the first position, the first rotatable gate is in the open position and the second rotatable gate is in the closed position;
• rotating the adjustable-volume measuring chamber to a second position to stop flow of the material to be dispensed out of the reservoir portion, wherein in the second position, the first rotatable gate is in the closed position and the second rotatable gate is in the closed position;
• and
• rotating the adjustable-volume measuring chamber to a third position to dispense the material to be dispensed out of the adjustable-volume measuring chamber, wherein in the third position the first rotatable gate is in the closed position and the second rotatable gate is in the open position.