US 11,994,928 B1
Apparatus with presence detection sensors
Rachid M Alameh, Crystal Lake, IL (US); Andre David Brown, Issaquah, WA (US); Gopi Prashanth Gopal, Redmond, WA (US); and Stephen Ernest O'Dea, Bedford, MA (US)
Assigned to Amazon Technologies, Inc., Seattle, WA (US)
Filed by Amazon Technologies, Inc., Seattle, WA (US)
Filed on Apr. 7, 2021, as Appl. No. 17/224,754.
Int. Cl. G06F 1/3231 (2019.01); B62B 5/00 (2006.01); G01D 5/24 (2006.01)
CPC G06F 1/3231 (2013.01) [B62B 5/00 (2013.01); G01D 5/24 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A mobile cart comprising:
a frame comprising a first perimeter:
a basket coupled to the frame, the basket comprising:
a bottom defining a quadrilateral shape;
four sides protruding upward from the bottom, the bottom and the four sides defining an interior cavity of the basket to hold items;
a top having a second perimeter defining an opening to the interior cavity to receive the items placed in the interior cavity;
a first capacitive sensor located at a first side of the first perimeter;
a second capacitive sensor located at a second side of the first perimeter, the second side on an opposite side of the first perimeter from the first side;
a display coupled to the frame;
one or more processors coupled to the frame; and
one or more computer-readable media storing instructions that, when executed by one or more processors, cause the one or more processors to perform operations comprising:
receiving, at a first time, first sensor data generated by the first capacitive sensor;
determining a first capacitance based at least in part on the first sensor data;
determining that the first capacitance satisfies a threshold capacitance;
based at least in part on the first capacitance satisfying the threshold capacitance, determining that a user is located proximate to the mobile cart at the first time;
causing the display to activate based at least in part on the user being located proximate to the mobile cart;
receiving, at a second time, second sensor data generated by the first capacitive sensor;
determining a second capacitance based at least in part on the second sensor data;
determining that the second capacitance satisfies the threshold capacitance;
receiving, at the second time, third sensor data generated by the second capacitive sensor;
determining a third capacitance based at least in part on the third sensor data;
determining that the third capacitance satisfies the threshold capacitance; and
based at least in part on the second capacitance satisfying the threshold capacitance and the third capacitance satisfying the threshold capacitance, determining that the user is located over the first perimeter at the second time.