Consolidated human-machine interface (hmi) chassis

A consolidated plastic human-machine interface (HMI) chassis (114) comprising:

• one or more input devices (102), adjacent to electromagnetic interference (EMI) shielding material (104), the one or more input devices (102) and electromagnetic interference (EMI) shielding material (104) heat staked with a plurality of plastic heat stakes to a printed circuit board (PCB) (108),
• wherein the printed circuit board (PCB) (108) is removably attached to the consolidated plastic human-machine interface (HMI) chassis (114) with a plurality of metal screws (106) connecting to a plurality of plastic threaded inserts (107),
• wherein the consolidated plastic human-machine interface (HMI) chassis (114) comprises a plurality of plastic buttons (116) molded onto a first channel (118), wherein the plurality of plastic buttons (116) are sized, shaped, and configured to snap into a slot (134) of a lower cover (132) to securely lock the consolidated plastic human-machine interface (HMI) chassis (114) into lower cover (132) as the first channel (118) of the plastic chassis (114) slides between a plastic part (136) and the lower cover (132),
• wherein the plastic part (136) and the lower cover (132) optionally are ultrasonically welded together,
• wherein a power source (120) is held in position in a second channel (117) of the consolidated plastic human-machine interface (HMI) chassis (114),
• wherein the second channel (117) has a plastic tab (122), wherein the plastic tab (122) optionally has a molded-in wire channel (220),
• wherein one or more optional audio output devices (110) are removably mounted to consolidated plastic human-machine interface (HMI) chassis (114) with one of metal screws and plastic inserts (109), and
• wherein one or more optional seamless optical input devices (112) are removably mounted directly to the consolidated plastic human-machine interface (HMI) chassis (114) by snap fit.