How to use Force Sensitive Resistors (FSR) with Arduino - Simple Force Sensing Arduino Tutorial
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- Опубликовано: 8 авг 2024
- In this video I will show you how easy it is to use Force Sensitive Resistors (FSR) to measure forces using an Arduino or other microcontroller with Analog Input. FSR's are relatively inexpensive and are great for simple projects where a rough measurement of force or weight is required. Unlike load cells, FSR 's can be used without an amplifier. They are easily interfaced with Arduino using an analog input channel.
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This might just be the best youtube channel I've come across, not including RedBull/Drone Videos, Judo or Unbox Therapy
Glad it is helpful. Thanks for watching!
Thanks so much, this was really helpful. I have a final arduino project due tomorrow morning, wish me luck!
Sorry, just saw this. Hope you got an "A" on your project!!!
You've got cool stuff keep up the awesome content Sir 👍
Thanks, will do!
Thank you this helps a lot and easy to add more sensors with this logic
Glad it helped!
this is a great video! thank you so much. just what i needed :)
Glad you liked it!
Thank you for the information.
You bet!
Thanks a lot for this amazing tutorial!
You're very welcome!
Great video!! Super channel
Thank you very much!
Awesome video and very helpful for a personal projet I'm working on! I was wondering if you have recommandations for stronger connection between the fsr and the rest of the circuits because my fsr placement is prone to sliding and shifting. Second, where did you find your weight column (first one on the excel) showed at 3:20? I'm using a 402UX and I'm working with heavier range of the pression and I'm still looking for the optimal resistance for my divider (any help will help :D). Thank you so much again to make quality content available!
The weight column was just different weights that I tested. Just try different weights to build your own table. Hopefully that is what you were asking.
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Do you need a finger or conductive contact for the sensor to work? I am thinking of putting these sensors on a robotic gripper I am building and it will be used for picking objects up. I got told that these resistors need a conductive material for it to work such as a finger? Is this true?
You don't need a conductive material. The medium is all enclosed in plastic. It works really well pushing on it with a hard rubber. I often use a pencil eraser the same diameter as the sensor.
can I measure the impact force using this?.I want to build an impact analyzer. I want to measure real-time impact force due to cricket ball after hit the arm guard
It is possible. Just know that the sensors are non-linear, so a strain gauge setup might be more accurate.
Hi, thanks for sharing! Do you have any idea what effect an increase in temperature would have on the FSR? i want want to measure a force between two 200 degrees celcius plates
Not sure. Let me know what you find out. It may change the readings, but if it is at a constant temperature it should be repeatable.
How does the resistance vs force graph look on a log-log / semilog scale?
Thanks for sharing:)
It would smooth out a little bit, but I suspect it still would not be too linear. But it still works great for simple comparisons.
@@ScienceFunInnovations
Thanks for the reply. The reason I'm asking is because the fact the the resistance is not linear in the force doesn't necessarily mean that it's hard to predict one from the other. Plotting the data log-log / semilog scales could tell us about the functional relation between the two. For example, an exponent would look like a straight line on a semi-log y scale while a power-law look like a straight line on a log-log scale
Hi, i want to cover a padel racket and have a sort of hitbox of where i hit the ball, could this work or do you have any suggestion for some kind of sensor?
Probably not good for that as you would need a ton of analog inputs, better to use something like a membrane keypad maybe????
please sir I have a school task, and my project about teakwondo protectors with scoring systeme, and I want to use FSRs for detecting the applayed force but you said that it work only for light objects, so do you have any ideas, thanks for the video!
They do make larger FSR's with varying force sensitivity. You may still be able to use one.
Can we control servo based on if signal> treshhold move servo to 180? or it needs to be mapped from 0-1023 and move proportionally?Thank you
Yes, that is very possible.
Hi. Could you let me know what resitor use for FSR UX 400 sensor?
I'd look up the data sheet and select a resistor using a voltage divider circuit.
Hi! I have an issue. The resistants doesn’t stops to change if I put a weight. Starts from20k and drops down for 14K with a constant pressure. I have an FSR with 0,2-20N sensitivity.
Not sure why its doing that...
nice in a lab enviroment, any tips for how to protect this flimsy plastic in real usage
I've built 3D printed holders for them...and use a rubber ball or pencil eraser in the other half of the fixture to help distribute the load over the sensor.
The small fsr in the video, whats the lowest measurements in gram in can measure?
Depends on the sensor, but not great for very small loads. Some might go as low as 50 grams.
Is it possible to connect and read the outputs of multiple fsrs using one Arduino (or other microcontroller)?
Yes. You can have one fsr for each Analog Channel.
Thanks for your great video , Can I Measure force newton with this method?
Yes you can. You would just need to calibrate it and build a force vs. resistance curve.
@@ScienceFunInnovations Thanks for your reply. Do you have any video or tutorial about this ?
To use the FSR, do you need an Arduino? Can you just hook it up to a regular circuit (power source + light)
It is just a variable resistor, so you could design a circuit without using a microcontroller.
i want to use the FSRs sensors for a teakwondo body protectors scoring systeme, but i learned that this sensor is tamperature depend, so is that true ? because if that's true will affect at the scoring systeme
It may be temperature dependent, but probably only with extreme temperature changes.
How would you measure the force of objects larger than the FSR itself?
You could use 3 or 4 seperate FSR's and build a scale ( a table with each leg sitting on an FSR.
I am having two joyit sensors 0-2kg and 0-10kg. But I am not sure the values are correct. how do I calibrate it ? please tell me the procedure to calibrate the sensor and give me correct values
I used a small scale and pressed down on the sensor with a pencil eraser. Then I made a table that compared the analog value to the weight. These sensors are non-linear, so you need some sort of calibration table.
How do I calculate the changing resistance in accordance with the changing force? is there any formula or should I practically find it out?
It is not linear, so you have to test it with different weights.
Like Science Fun said, you will have to do testing at various different forces and try to find the line of best fit. I did something similar with a time of flight sensor since the offset of the measured distances from the true distance isn’t linear. I actually got fairly good distance measurements and was off by no more than 0.25 inch (which was more than adequate for the project I was working on).
What is the reading of the sensor, does it read resistance, voltage or pressure?
The sensor changes resisitance based on force. Using a second fixed resistor, you create a voltage divider which you can read with the Arduino.
Hi. I am connecting the JOYIT SEN-Pressure sensor (10kg) to Arduino UNO. Using your code and I can't measure the weight/force (in Kg). Could you help, please?
You will have to test it with a scale and build a table that converts voltage (analogRead) to kg. I used a postal scale and pushed down on the senor with a pencil erasure.
What if I wanted to attach, say, 100 FSRs to an Arduino. Assume I'd want to be able to know the reading of each FSR. How would I do that?
You would need 100 analog channels or a way to switch between FSR's.
Does it work with rising water? For example, a force sense is placed on the side of a bridge. When the water rises and touches the force sensor, will it work? Thank you in advance
It would not work well with water. It would need more force.
@@ScienceFunInnovations Thank you
The resistance R2 values are they arbitrary or manufacturer provided ?
Some of the data sheets will recommend an R2 value. Otherwise, I just play around until I get the desired results.
Does the FSR measure the weight
It can measure weight, but it is non-linear so it is not as accurate as a load cell.
the last value of fsr represent force in newton ??
I use pounds.
@@ScienceFunInnovations please i need to know how does the 10 kohm resistor works can u help me ?
Does the sensor work if kept under water/fluid?
Yes - If you cover up the terminals/contacts with an insulator.
what equation were you using for the Analog read next to the arduino output?
Not sure... you mean the voltage divider equation?
@@ScienceFunInnovations no, sorry. Having trouble getting the output to the left of the Arduino outputs to come out correctly. I got all the other values using voltage division but when you hovered over that 2nd to last column, I thought those were the actual registered values and the last column was the inverted output. So I was trying to use Vout=Vin(5/1023) for the 2nd to last column.
If i am using raspberry pi and arduino both the i connect the whole circuit to the arduino bord and write a program in python means in raspberry pi then what is the code can you please tell me
Sorry, I haven't done too much with Rasberry Pi or Python. Still on my to-learn list. :-)
Is this device suitable for loads of 100lb?
The make different ones with different loads. I think this one saturates after 15lbs.
can i use fsr as a pressure sensor for a seat
It would be difficult because the weight needs to press directly on the sensor, which is very small.
@@ScienceFunInnovations ok but what we need is only to check if there is weight on top not really the specific weight just whether there is pressure on the seat or not also will the sensor be damage if a human sits on it
does anyone know how I'd connect about 200 sensors to an arduino?
You can connect several 1-wire sensors, but I don't know about 200. May need several Arduinos that send data to a master Arduino.
What type of measurement are you trying to do?
@@ScienceFunInnovations It's for inventory management. Binary, something is on a shelf or not.
@@akyle96 Look into daisy chaining parallel-in serial-out shift registers. Haven't used them myself, but you should get one giant chain of 0's and 1's that you can analyze with your code. And you should get by with just the serial rx pin if I understand it correctly.
@@ScienceFunInnovations I'll look into that, thank you!
Hi Can I use this FSR for measuring upto 10- 200 KG. Please give the value of resistor to be used or the relevant video link. Thanks.
Different model FSR's have different ranges. The value of resistor will depend on which sensor. I just selected on that maximized the range of analog input values from the sensor.