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What is the proper way to connect wires to contacts from a thin semitransparent "plastic" foil (see images). There are slightly different types; the first one with the 4 pins in a row is the more important one)? It is a thinflexible foil with pressure sensors, which are connected via the thin metal streaks to the "pins" on the right.

Just solder, or are there kind of clamps that I can use? Are there any normed/standardized connectors/clamps? I'd like the contacts to be as "non-destructive" as possible (considering my current soldering skills, to be honest, but I can try to improve), and to be absolutely as flat and stable as possible (max. 1 mm (ok, maybe I have to relax that to about 3 mm), must stand a person's weight stepping on them multiple times).

I was searching on the web for a long time w/o success, and realize I may not even know the correct term for this kind/type of electronic constructions on foils, so even that might help a little bit - may I ask you to tell me the correct name?

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The fact that they are shaped more pointedly at the end suggests that these are in fact meant to be directly soldered.

max. 1 mm,

soldering seems to be your only option, then.

must stand a person's weight stepping on them multiple times

That sounds questionable, at best. Wire-to-anything-solid connections are notoriously prone to breaking under repeated stress; you'd want to add enough housing and strain relief to make sure pressure is only (if at all) applied flat on the contacts, and nothing pulls or shears on the cable connection.

In fact, since this probably has to go into a housing with confined space: Consider designing a flex PCB with matching contacts on one and, solder to that, and use it to get the signal out of the mechanically stressed region.

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