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Question is what you intend to do with the forces, i.e. what shall happen if the stick is pushed into one direction, and what when it is released afterwards. In this case the motor speed can follow the force, or what else shall the force value be used for?
Hope I'm not leaving to many unanswered questions. As time goes on I assure you I will grasp more and more concepts, once I get some kind of baseline. Thank you for your patients!
2axis loadcell
I believe that you are referring to the rotational torque of driving the screw in? If so we do not need to measure that force. In the setup I am creating I do not anticipate any torque force that could not be analyzed in their component forms. So, for now, x,y,z axis measurements will do.
wvmarle: That'd be a single direction tensile force. That's a whole different thing than trying to measure rotational and tensile forces in all directions all at the same time. The first is very easy. The second may be nigh impossible.
The extent of my knowledge is being able to identify a resistor. The getting started pages here are still a bit over my head. If there is someone that can remember what it was like to get started and point me in the right direction that would be great. I've got a school project I'd like to accomplish with the arduino that I posted about yesterday. However, I may be asking the wrong questions as a result of not knowing what or how to ask just yet.
DrDiettrich: There remain more questions than before I hope to find the right English wording, I'm not very familiar with the physical terms related to your task.
It appears you would like a full description of the problem to make a better determination. I have an engineering project for my college statics course. The following actions will be performed to complete this project: • Calculate the maximum amount of force every mechanism can handle while maintaining smooth operation of the hinges and locking mechanism. • Create a model of a typical door and its mechanisms. • Compare experimental results with analytical calculations
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Your load cell sensors require that the force is applied at right angle, to the bracket on their tops. They are designed for measuring positive forces only. The set of 4 sensors is intended for building a body scale, where the 4 sensors support the four corners of the step-on platform.
FirstRodeo: It appears you would like a full description of the problem to make a better determination. I have an engineering project for my college statics course. The following actions will be performed to complete this project: • Calculate the maximum amount of force every mechanism can handle while maintaining smooth operation of the hinges and locking mechanism. • Create a model of a typical door and its mechanisms. • Compare experimental results with analytical calculations
Multiaxis loadcell
wvmarle: A typical amplifier takes four load cells, but is designed to treat them as a single measurement. Typical under a single plate on which the load is placed, like a typical scale.
When you know all that, you can start to look at what hardware there may be available that can do what you want to measure.
6axis loadcell
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My idea to attack this problem is to 3d print an entire door, frame and hinges. Around the screw area (of every screw) there will be a place to embed the load censors on the axis of the screws. The screws and door will be scaled to accept the size of the load censors. (if there are smaller ones, I'd love to know about them. The ones I'm looking at are 32x32mm)
I cannot recommend a special strain gauge nor amplifier. Load cells are fine for your first steps, later you'll have to consult application notes on mounting strain gauges.
Bi-AxialLoadcell
Your load cell sensors require that the force is applied at right angle, to the bracket on their tops. They are designed for measuring positive forces only. The set of 4 sensors is intended for building a body scale, where the 4 sensors support the four corners of the step-on platform.
wvmarle: As I understand it, you take a screw, encase it in some material, then grab it and pull it out, all the while measuring the force it takes to do this pull.
wvmarle: How do you plan to mount those sensors to your screw, to measure the force without influencing the force or the way the screw is used? Screws tend to be small, and forces large.
All these questions are not related to an Arduino at all, I'd suggest that you ask your teacher about these details of your task. Or you tell us more about the values obtained from the analytical calculations, so that we can find ways to measure their equivalents on the 3D printed model.
There remain more questions than before I hope to find the right English wording, I'm not very familiar with the physical terms related to your task.
Exactly! However, right now the engineering isn't my problem. I am trying to figure out the hardware needed to collect the data just on the arduino side. I'm no expert, but already somewhat familiar with testing methods. I believe I can make it work.
From your statics course you should know about strain, and that's what can be measured with strain gauge sensors, and that's how the load cells work. Of course the strain is related to a force, but only depending on the stretched material's characteristics. Look up how strain gauges can be used to measure linear force and torque, then find out how they can help you in your experiment. The application of strain gauges is a science of its own, because the glue must hold them exactly in place, without any displacement under stress (creeping,...), so that the elongation of the gauge reflects perfectly the elongation of the surface to which they are glued. That's why readily usable components are used in serious applications, with already mounted strain gauges, but load cells certainly are not applicable to your task. Find out what other components are available, and figure out how these could be used in your task.
wvmarle: Sounds like it's mostly an engineering problem. You don't just place such sensors in critical spots - the door has to be suspended directly from them. So the hinge attaches to the force sensor, which attaches to the door frame.
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Our hydraulic nut eliminates conventional bolt load torqueing inaccuracies occurring from stud twisting and friction losses at the nut face and thread interfaces. The compact standard sizes of our hydraulic nut are ideal for confined spaces or where envelope restrictions prevail.
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So I've run into a few issues. Hoping you guys may have some insight. I am able to get the half bridge load cells from the first post to run by using 100ohm resistors to complete the bridge. Below I've posted a cheap diagram I drew (from load cell to amplifier to uno), the cpp code, test code, and the calibration code that I've started with. Took me quite some time to get that far. But now my problem is that there is some negative drift in the readings from the load cells. e.g. I put a weight on the cell, get it calibrated and after a very short time (seconds) the given weight value consistently falls.
As I hope is more clear now, I will need to measure the static forces placed on a door in open and closed positions. So a simple pull test will not suffice.
I have people that can help me trouble shoot any code problems. Before I get that far I need assistance with the hardware selection tho. I'm sure I'll need more help along the way because, honestly, the get started stuff is simply in a language I don't understand just yet. I assure you I will learn and I appreciate your help and patients.
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2axisforce sensor
Now that we know we're dealing with the later, the hardware needed for the theoretical project is what I believe I need. The the design, location and assembly I am most certain I can handle. The code should be easy enough to make work with the help of my wife. She is a very capable programmer (not in C++, but she can pick up any syntax fairly quickly).
As the strain depends on the stressed material, I have no idea how to map values measured on a (down-scaled?) plastic model, to some other door mounted to a wooden (metal, stone...) door case.
According to your last reply it looks to me like you do not want to build a joystick at all. The pullout and drive in force can be understood in two ways: brute linear force in in/out direction, or torque required to drive the screw in and out (for electric screwdriver...). So what's the way you apply the force to the screw?
As more details become Available, I will surely share the data. The strain gauge was my initial thought. However I had read that the accuracy was much less reliable. Could you recommend a tiny strain gauge to experiment with? And would I need a different amplifier than the one in the link above? I called it a "control board" in the first post, before I knew slightly more about it.
How many you can connect to a single Arduino depends on many factors, such as sampling rate, type of Arduino or other microprocessor, and the interface with the load cell amplifier. A better approach is to figure out how many of such load cells you need, then you see how you can interface them, and then you will see what microprocessor you need.
That'd be a single direction tensile force. That's a whole different thing than trying to measure rotational and tensile forces in all directions all at the same time. The first is very easy. The second may be nigh impossible.
I have found a similar kit with a plug in adapter. But, my questions still are; how many cells can I run on this arduino uno? Will there be anything needed in addition to this kit (excluding load cells and amplifiers for the cells)?
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As the strain depends on the stressed material, I have no idea how to map values measured on a (down-scaled?) plastic model, to some other door mounted to a wooden (metal, stone...) door case.
3axis loadcell
Sounds like it's mostly an engineering problem. You don't just place such sensors in critical spots - the door has to be suspended directly from them. So the hinge attaches to the force sensor, which attaches to the door frame.
Now you can also see the problem of measuring multiple axis at the same time: they will affect one another, as in the end your sensors basically share the weight. The door having to hinge in the process just adds a lot to the complexity of the whole system.
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I'm sorry I don't fully understand the direction of this question. However, I will need every force acting on the object, so both?
Now you can also see the problem of measuring multiple axis at the same time: they will affect one another, as in the end your sensors basically share the weight. The door having to hinge in the process just adds a lot to the complexity of the whole system.
The internal 1000 ohm half bridge strain gauge, the measuring range is 50kg weighing sensor, half bridge structure. Size: 34mm x 34mm This sensor is a group of half bridge strain gauge, using the method can have the following three: 1, using a...
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As with many Arduino projects, it's a lot harder and more complex than you may think. What sensors exactly do you plan to use? How do you plan to mount those sensors to your screw, to measure the force without influencing the force or the way the screw is used? Screws tend to be small, and forces large. Do you want to look for tensile or rotational forces? There indeed are six, not three.
The Load Sensors are for 50kg force/weight, how much force do you intend to apply to the screw? These sensors are quite big, do you have enough space on your "screw" for mounting them? Rotational forces also can occur, you'll need 6 sensors to measure these as well.
A simple 4DOF joystick with only switches can detect movement left/right, back/fwd, up/down, and cw/ccw turns. It can be used to e.g. activate motors while the related contact is closed.
Singleaxis loadCell
The sensors shared in the link above are my initial thoughts. However, I am open to any suggestions as they are the only ones I am aware of. The half bridge is enough accuracy for my needs. I also intend to get the amplifier to make them work. If there is a sensor that is better at the job I'll take it. If there is a way to get positive and negative results, that would be ideal as I need pullout force as well as drive in force.
wvmarle: When you know all that, you can start to look at what hardware there may be available that can do what you want to measure.
A crawling value can result from thermal effects, or integration on open pins. Give your circuit some time for warm up and thermal settling (10 min.), then calibrate and check again. If the value converges to the supply voltage, after some time, check the circuit for unconnected pins or too high resistors.
All these questions are not related to an Arduino at all, I'd suggest that you ask your teacher about these details of your task. Or you tell us more about the values obtained from the analytical calculations, so that we can find ways to measure their equivalents on the 3D printed model.
From your statics course you should know about strain, and that's what can be measured with strain gauge sensors, and that's how the load cells work. Of course the strain is related to a force, but only depending on the stretched material's characteristics. Look up how strain gauges can be used to measure linear force and torque, then find out how they can help you in your experiment. The application of strain gauges is a science of its own, because the glue must hold them exactly in place, without any displacement under stress (creeping,...), so that the elongation of the gauge reflects perfectly the elongation of the surface to which they are glued. That's why readily usable components are used in serious applications, with already mounted strain gauges, but load cells certainly are not applicable to your task. Find out what other components are available, and figure out how these could be used in your task.
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FirstRodeo: My project is to find the forces exerted on a screw (simply put) and I'd like to use an Arduino to record the forces. So I need to get positive and negative forces on all 3 axis and log the data in real time to be put into excel for calculations.
3axisforce sensor
EDIT: This project is working and moved into stage 2. The code for this project is on page 3 along with questions for stage 2.
A typical amplifier takes four load cells, but is designed to treat them as a single measurement. Typical under a single plate on which the load is placed, like a typical scale.
Thanks! That was the(main one anyway) answer I was looking for. I'll keep y'all updated as I progress. It will be a slow process. The project isn't due until December. As I come up with more problems I hope I can come back for more answers.
As I understand it, you take a screw, encase it in some material, then grab it and pull it out, all the while measuring the force it takes to do this pull.
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FirstRodeo: I have found a similar kit with a plug in adapter. But, my questions still are; how many cells can I run on this arduino uno? Will there be anything needed in addition to this kit (excluding load cells and amplifiers for the cells)?
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wvmarle: As with many Arduino projects, it's a lot harder and more complex than you may think. What sensors exactly do you plan to use?
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My project is to find the forces exerted on a screw (simply put) and I'd like to use an Arduino to record the forces. So I need to get positive and negative forces on all 3 axis and log the data in real time to be put into excel for calculations.
The screw will be encased in a solid material and the sensors surrounding the material. I expect acceptable error percentage from this method. However, the pullout force still have some investigating to be done. The cad work is still in development.
How many you can connect to a single Arduino depends on many factors, such as sampling rate, type of Arduino or other microprocessor, and the interface with the load cell amplifier. A better approach is to figure out how many of such load cells you need, then you see how you can interface them, and then you will see what microprocessor you need.
I'm trying to break into the world of Arduino's and have no clue where to start. I'm in no rush and really want to learn this and more.