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SparkFun will be closed on Tuesday, November 5th to support our team in being able to go out and vote! Orders placed after 2 pm MT Monday, November 4th will ship on Wednesday, November 6th. Thanks for your patience and understanding.
Julia Truchsess
Member Since: May 27, 2010
Country: United States
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I backed this item in its crowdfunding campaign a couple of years ago and have used it almost daily since. It's extremely well-made, reliable, and useful.
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It might be of interest to users that it is the conductance of these sensors that is linearly proportional to pressure, not their resistance. When you use them in a simple voltage divider circuit the voltage output will be highly non-linear, i.e. a 1/x curve. For a linear voltage output proportional to pressure you need to drive it with a constant-current source. The simplest way is to connect the FSR between a fixed reference voltage and the input of an op-amp inverter (with no other resistance in series with the FSR). The feedback resistance and the value of the reference voltage will determine the output range. Of course, the output will be inverted and you need to set up the opamp's power supply properly.
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I've put 18W rms into it for several minutes. Gets mighty hot but hasn't burnt out. I wouldn't advise running it continuously at this level, but it's quite robust.
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M5 x 0.8.
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This thing is very solidly built, no complaints about the price from me; well worth it imo. If anyone needs to know, the central post's thread is M5 with 0.80mm pitch.
No public wish lists :(