A projector includes a housing, an image projection unit, and a plurality of connection ports including a power connection port. Certain methods comprise sequentially exposing a substrate surface to alternating flows of an organometallic precursor and a reductant comprising M4 to produce a metal alloy film on the substrate surface, wherein M is selected from hafnium and zirconium, and the organometallic precursor contains a metal N. An electrical characteristic of the stress sensor or stress sensor circuit, which has a variation correlated with changes in the magnitude of the mechanical stress, is measured and then assessed to determine the stress magnitude.