This is a force sensitive resistor with a round, 0.5" diameter, sensing area. This FSR will vary its resistance depending on how much pressure is being applied to the sensing area. The harder the force, the lower the resistance. When no pressure is being applied to the FSR its resistance will be larger than 1MΩ. This FSR can sense applied force anywhere in the range of 100g-10kg.
Two pins extend from the bottom of the sensor with 0.1" pitch making it bread board friendly. There is a peel-and-stick rubber backing on the other side of the sensing area to mount the FSR.
These sensors are simple to set up and great for sensing pressure, but they aren’t incredibly accurate. Use them to sense if it’s being squeezed, but you may not want to use it as a scale.
Note: As it states in the Integration Guide, do NOT solder directly to the exposed silver traces. With flexible substrates, the solder joint will not hold and the substrate can easily melt and distort during the soldering. We recommend using a male or female clincher connector instead.
If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.
Skill Level: Noob - You don't need to reference a datasheet, but you will need to know basic power requirements.
See all skill levels
Based on 17 ratings:
1 of 1 found this helpful:
Resistance goes down with increasing pressure. Used this in a robotic arm application where the FSR was in a bite switch that activated the arm. Turns out moisture will wreck the FSR, so protecting it appropriately is necessary. Also when using this part between two hard surfaces like plastic, it helps a great deal to put pad over the FSR to act like the lad of your finger.
1 of 1 found this helpful:
I bought this resistor because i needed a pressure sensor, not one precise enough to build a scale, but giving more information than “something is there” and “Nothing is there”. That’s the way its datasheet describes it, and that’s exactly what it is, so yay FSR 0.5".
1 of 2 found this helpful:
Does what it is supposed to do. If the object is not the same diameter as the sensor I had to put an object of thst diameter under it to make the sensor work. But that could be my resistor value i chose as well.
I’m perfectly happy with the results.
Works well, perfect for breadboard prototyping!
The first one I bought I soldered vertically into the board just to find out that the metal paths in it can easily break. So I bent the leads on this one 90 degrees and glued the resistor to the PC board. Works great. I have the output of the voltage divider feeding into my Arduino’s analog input and the Arduino programmed to write raw data onto an SD card. I wrote a program in Visual C# to format the data so it can be imported into Graphical Analysis or Spreadsheet.
Over the last few months, I have purchased 8 fsr sensors. Out of this, 4 have broken (one has gone unused, bought extra in case of more breaking), The gold-colored metal rips off of the plastic. This is very unfortunate and dissapointing. Otherwise, Sparkfun products has been great. I have done many many projects using Sparkfun products, and this is the first issue I have come across.
This product works wonderfully when functional. It should be confined to breadboard use only, but then there is little practical application aside from pinching with your fingers.
These sensors, despite being a bit expensive, work great for detecting foot steps on a floor we made. Much better than the other kind of sensor we are testing out at the same time.
I was able to implement my project just fine, the sample code on this site was also a big help to start me off quickly.
I am using it for heel strike and toe-off event detection and it is giving me results which are perfectly fine. Thanks!
Used 12 for Arduino toneKeyboard project. Students loved it.
The sensor works fine……… I used it to measure the weight of an object on a mock assembly line for a college project. It worked as expected.
I make and sell Eurorack Synthesizer Modules based around these FSRs under the brand name Synthwerks, and find that SparkFun is constantly cheaper than any other vendor I can find. Their service is great. I have even had SparkFun drop ship these to users in the EU who needed replacement parts. The units are very sensitive and quite robust. They can be dented with sharp objects (this makes them act as though they are being pressed) but that can be prevented by using something as simple as a cut-up old mousepad laid on top. The FSR will still work fine, and some people find they work better for them that way. You do have to be careful soldering the leads, too long with the iron and the flex circuit will melt. The self-adhesive backing is a great thing for mounting them and they do stick on very tightly. I peel the backing off halfway (exposing only part of the pad) and then align them where I want, stick down that exposed part, and then pull out the remains backing and press them in place. Once glued down, they cannot be removed easily without destroying them so make sure when sticking them in place. We use both the .5" and the 1,5" square versions and both are excellent devices.