Force Sensing Materials
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- Опубликовано: 26 ноя 2019
- This video will describe materials you can use to build your own pressure/force sensors. A microcontroller interface using an Arduino Nano will be covered.
BC Robotics:
www.bc-robotics.com/product-c... 
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Well done ! This might be a good solution for sensing fingertops for robots.
That was really interesting, and lots of ideas had spawned in my head already. Thanks for your videos, they're to the point, no flashing intros and sponsorships. It's refreshing, among all the paid channels.
You're welcome!
Thanks for the tips. The applications are countless!
You're welcome!
appreciated - good to see Forth being used.
Very well put together!
Great informative video sir!
Thanks for the feedback.
Very nice video. Great ideas.
I really enjoy your videos. I hope you keep making them!
Thanks for the feedback!
Sir... you're as straight as an arrow!!!
I'm trying to develop a sensor that can be buried into the ground and installed, say every 50 feet, in order to detect intruders jumping a 6ft fence into my property (a typical problem in Brazil). Until I stumbled upon your channel I had no idea that there are so many choices out there! We all appreciate you sharing your expertise!!! ;)
Thanks for the feedback. Glad I could help.
This is interesting. Plenty of ideas could be realized with this, from simple switches to pressure sensitive skin-like arrays.
I guess you could make a crude force sensitive touchpad out of an array, or maybe out of two electrically separated layers of intersecting "lines" and "rows". You could have the position data as well as the pressure data.
You could use some of this in electronic piano keyboard for adding per-key vibrato ability, not to mention keystroke force. Although, wear-resistance would have to be taken into account when choosing the material used.
Our maybe sending pressure on a usb computer keyboard, turning some of the keys into kind of analog inputs.
I guess all kinds of analog momentary inputs could be done this way if precision wasn't important.
Thanks, I have a nano and with practice it can be programmed to assimilate many things.
Short video but very useful! Thank you so much
You're welcome!
Thanks for the information you saved my project.
You are welcome! Glad it was helpful.
Super explication!, de luxe, thanks!
Thanks for the feedback.
I’d love to see you do a video specifically measuring impact force, say up to 10lbs max, with a value readout on a display. I’ve looked everywhere on RUclips and some only touch on impact as an example, but none really show anything dedicated to it even though it’s an extremely useful metric to measure. Very cool videos 👍🏼
You can measure impact using an accelerometer and calculate the force applied:
ruclips.net/video/nDmlsHCuBlI/видео.html
To get a force reading directly in LBS you could use a load cell strain gauge. The force can be applied to a cantilever beam where the fulcrum can be adjusted to match the max rating of the load cell.
ruclips.net/video/3LoVl_qjeR4/видео.html
The reason I was saying using a method like this to measure the impact is because it would be interesting to apply that to the force of a trigger hammer striking a firing pin to see the max force of the impact. This metric can be useful in diagnostics of light primer strikes and to also compare different weight fire control group springs and to compare between brands and styles of fire control groups. I know this seems specific to one application, just a project idea I’ve been throwing around in my head for a while which is what lead me to this video to begin with lol. Just a little light reading lol
Thank you.
You're welcome!
Very nice Ideas. However, these sensors have nonlinear behavior and they are great as switches. It's interesting to see some linear sensors that provide a proportional output to the applied force.
Thanks.
Mohammed Algailani : Piezoelectric materials are linear. Their parameters are well defined for the many types of piezoelectric materials. The charge or voltage constants tell you the charge or voltage generated per unit force or pressure. I don’t recall the other sensors but if they’re non linear then the micro can work it out for you, worse case would be a lookup table.
Thanks for sharing , very nice video
Thanks for visiting
man thank you very much
You're welcome!
Great
اهلا استاذ وليد ما توقعت احصلك هنا لكن قاعد احاول صنع مثل هذا المشروع
great video!!!!
Glad you liked it!!
@0033mer I gotta try that foam. I saw video where someone was using VHS tape as variable ribbon resistor, i think i'll try that with C-cassette as well :)
Thanks man👍👍✌️✌️
Your welcome.
Gold.
Great. Thanks for sharing the fantastic information.
I want to build my own bite force sensor & bent-pressure sensor for generating sound frequencies for a midi player... Can the conductive foam be used.... Can you share more technical details about how to do it.... and from where we can get free source material?
Kindly help... 🙏🏻🙏🏻🙏🏻
From a cost/feasibility standpoint, what do you think would be ideal for something like a pressure-sensing skateboard ramp, or dance floor or something? I like the foam idea, I didn't know about that one.
I have introduced a few options so it depends how you implement them as far as cost goes. Velostat would be something to look into for large projects.
I saw an ingenious pneumatic player piano roll motor control circuit incorporating a piezo activated by air pressure
As you have tried them all, if I'd like to use something to measure the pressure in several points to distribute the weight right in the centre, will this be the right option to measure the different readings from different points and prompt the user to redistribute the weight?
Wow
Any idea on how to build a momentary expression pedal for guitar effects with these sensors?
Those films look interesting, I imagine an array could be used to make a touch sensitive “skin”. Is it possible to use an array of contact points like a keyboard matrix to get local pressures or will the film spread the electrical signal across its surface if it’s not cut into disconnected sections?
Yes .. check online, there are others who have built an array of contact points using Velostat.
This is a great overview, thanks! Yet more evidence for me that the standard way to use velostat is sandwiched between conductors, and not used to bridge across two conductors like the first example I saw. Also, I'm curious, do piezo sensors detect force, or do they detect percussion? My understanding is that they don't work very consistently to measure static force. Is that right?
Here is another video using velostat as a pressure sensor: ruclips.net/video/seMVgJ41BZw/видео.html
Yes, Piezo sensors basically detect percussion. They output during acceleration and not during static pressure.
A good example of that is an engine knock sensor. ruclips.net/video/fZGUzk-BYgQ/видео.html
To measure static force use a strain gauge (load cell). ruclips.net/video/3LoVl_qjeR4/видео.html
@@0033mer Thanks for the answer! Yes, I've used knock sensors for a digital drum before, and I just wanted to check I had the right info. I'm now making MIDI pads that need static force sensitivity for sustain, so velostat is definitely the way to go from what I've seen.
Squirrels hate these things! However the birds couldn't be happier.
What a helpful video! Can I have a question? Should i buy a 1mm and pile it up or 3mm piece of antistatic sponge? (1mm is half the price of 3mm). Thanks.
The foam is conductive so you can layer them.
For the foam and film sensors. Is there a way to have it only react to something that’s like 300 lbs of pressure and up? Basically ignoring human input.
@0033mer Very interesting and useful video. I'm planning to do a DIY MIDI controller and put a sensor and I have no experience with those components, May I ask you the order of precision and/or reliability of each kind of sensor?
FSRs are the easiest to interface to electronic circuits for trigger applications.
ruclips.net/video/u2EHDyrV_F0/видео.html
could we increase the range of the sensor from 10 kg to 100 kg by putting a layer top of the sensor?
Can a force sensitive resistor be made from antistatic mat?
I'm looking to build golf targets using pressure sensors so when hit they light up LED's, can you help?
What is the resistor value used as voltage divider in the circuit of electrostatic foam at 2.53?
Every setup will be different but I used 47K.
Are your able to make the outlet a value on an lcd screen vs the 4 LED lights? Thanks
Yes, you can scale the ADC output values to your desired range and feed them to a LCD display.
Can I use piezo force sensors you have shown, for dynamic force measurement with high accuracy?
Please reply
If you need accuracy then you should consider a strain gauge or load cell.
ruclips.net/video/vvIe0BFBlFI/видео.html
Why do u form a voltage divider to feed into the microcontroller? Sorry I have an idea why but can you please explain?
To convert the changing resistance of the pressure sensor to a changing voltage that the ADC of the microcontroller wants to see, you would use a voltage divider. Check out this video: ruclips.net/video/rTO3U-0Njtw/видео.html
what's the part numbers for those beautiful white LEDs?
Check out Dipmicro. www.dipmicro.com/store/LED3W
interesting
charge pump for piezo ? the circuit looks like common emitter amplifier
The transistor is a MOSFET which is driven by a charge pump. It drives the GPIO input pin on the microcontroller when the Piezo is triggered.
@@0033mer
Im still not getting it, did MOSFET required higher supply voltage or negative voltage?
The MOSFET is a N-channel VN10KM which has a threshold gate/source voltage of 1.2 volts. The pullup resistor is connected from the drain to the 5 volt supply. When the piezo is triggered a positive DC voltage is applied to the gate turning on the MOSFET and driving the GPIO on the Nano.
@@0033mer so it is just a high impedance input buffer amp, was wondering why charge pump(dc-dc voltage converter) is mentioned.
Yes ... it is a high impedance input buffer that will not load down the (ac-dc) charge pump. The output of the piezo sensor is ac.
Can I have your circuit diagram for the antistatic foam sensor... And can you please tell me exactly where can find the antistatic foam?
Most electronics supply stores will stock anti static foam. www.jameco.com/z/HDBC-1206-25-12-x-6-Conductive-Anti-Static-Foam_2237896.html
A resistor and the static foam form a voltage divider feeding the ADC of the Nano.
ruclips.net/video/wEqfHo_guG8/видео.html
@@0033mer in this video u used a resistor as a voltage divider of how many ohms?
@@0033mer as I am not getting the same output as you are getting.. I am getting values between 920 to 970 only..
@@rynemascarenhas175 Ohmmeter the setup and calculate a resistor to give you a good range. You can also use a potentiometer and adjust for best results. I used 47K in my divider.
Hi! Our company is using FSR for our acoustic synthesizer and with some of our assemblies with our device, we're experiencing that the FSRs are being compressed.
The sound keeps going even not putting pressure on it. How this will be avoided? Thank you.
Yes, that is called loading hysteresis. Keep the compression duration time to a minimum and avoid heavy pressure together with proper software to avoid this problem. Check the data sheet for loading hysteresis specs.
@@0033mer Thank you for your response.
@@0033mer We need to apply glue on the FSR to place it on our device. Is this advisable? If so, what's the best kind of glue that we can apply to hold it permanently in place?
FSR is a crucial part in manufacturing our acoustic synthesizer, which until now, we're still finding out how to optimize its use and avoid issues.
Thanks again.
Use a 3M adhesive like their 3M 467MP Transfer Tape. Follow their instructions on how to apply the tape.
@@0033mer , I'm wondering if you have another platform where I can ask few more questions regarding FSR. I want to send photo regarding the assembly that I'm doing and maybe you might give suggestions of the proper way to adhere FSR or recommendations that I can apply into it.
Thank you.
so I use these things for midi applications and you basically just told me that a 12 dollar part comes free with my mobo in quantity so long as I buy the wicking which I already have lol
Hey. I’m looking for a paid freelancer to design and build a prototype similar to some of your projects above. Could you share a contact?!
Look for a local product develop company in your area. Here is an example of one in my area. www.klnklein.com/
4:52 stop doing that you big meanie. It clearly doesn't like being squeezed !
That was laughter!
why not stick the velostat insted of just placing it as a sandwich
Ive been tthinking about punch force sensor device for boxing training. Any advice?
Have a look at accelerometers or Piezo sensors. Check out these videos.
ruclips.net/video/nDmlsHCuBlI/видео.html
ruclips.net/video/fZGUzk-BYgQ/видео.html