Thank you for your interest in my plotter :) For a spring to work it must (1) be able to overcome the friction of the pen assembly (2) always maintain tension in the two motor wires (3) and the motors. My design notes at www.instructables.com/4-Wire-Horizontal-Plotter-Design-Notes/ show some of the things I tried.

Only one belt is required. GRBL is configured for CoreXY.

​@@qualityphotos1 You literally written as, I'm not that dumb! Higher print speed means belt should barely stretch even under High acceleration. Since this design has no crossing unlike Core XY this is only 1-belt high. Which means.. we can put 2 of this (maybe even mirrored so every axis is balanced) at same vertical space of core XY. That means we have double the belt pulling the printer head, more acceleration we can achieve! Might try that when I can get hand on the parts

I came up with it.

@@qualityphotos1 Can you better explain to me your interpolation equation. Thank you so much

@@CanPham-ko3iz A link to my code and project is given below the video. A stepping motor with 200 steps per revolution rotates 1.8 degrees per step. This means the motor rotates an even number of degrees every 5 steps (5 * 1.8 = 9 degrees). Since we know the true angle every 9 steps we can make a calibration table. Knowing the error between calibration points allows us to estimate the error of the 9 intermediate steps using simple proportion. This is the basic idea except that I have allowed for micro-stepping.

@@qualityphotos1 If I change 9 degrees to a smaller angle what will happen

@@CanPham-ko3iz The smaller angle MUST divide into 360 AND be evenly divisible by 1.8

Sorry ... I have abandoned this project. The only details are those in my replies to the previous comments below.

@@qualityphotos1 Can u plz share the data which is available? bcz im strucked in project examinations im not able to get any information regarding this sonic anemometer project plz help me

@@manupatil8762 Sorry ... I have no further data on this project

@@qualityphotos1 Can u share atleast wat data u have? plz 🙏🙏🙏

Within reason ... yes. Check out my design notes at www.instructables.com/4-Wire-Horizontal-Plotter-Design-Notes/

Thank you for your interest in my plotter :) While my 4-wire plotter can be scaled-up to virtually any size the following links are to a plotter I designed that can also be scaled up to A0, and greater, and which has a resolution of 80 steps per mm. www.instructables.com/CoreXY-CNC-Plotter/ www.instructables.com/How-to-Control-a-Servo-Using-GRBL/ www.instructables.com/CNC-Pen-Lift-1/ This alternate plotter has the advantage of higher resolution and doesn't (potentially) smudge your artwork. It also accepts the GRBL motion control software for CNC machines. Regards manufacturing one for you ... sorry I have moved into a retirement home and don't have the facilities.

Thank you for your interest in this project. You will need to intercept the data being sent to the display and output it in comma-delimited format. I don't have the time to do this for you but it should be fairly straight forward.

@@qualityphotos1 Thanks for replying my question. If i manage to make same replica of this model are you willing to help if get stuck anywhere or get any error while saving data in excel sheet. If yes i will really appreciate it. Because it's going to be expensive project for me as beginner if i fail to complete it😅 .

Shorting all electrodes together will produce flat lines as there is no signal. Touching either the left or right electrode with your finger, as shown in the video , should produce a waveform. If it doesn;t then you have a fault somewhere. All construction details are in this article www.instructables.com/Mind-Control-3-EEG-Monitor/

Not certain that I agree about the precision (goliathcnc.com/) but I take your point about a free-standing omniwheel with no point of reference. This plotter uses stepper motors so a rotary encoder is unlikely to improve the precision. Wheel slip, and a lack of wheel roundness, affect the accuracy.

Thank you for commenting :) Full construction details and code may be found here www.instructables.com/4-Wire-Horizontal-Plotter/ Some design notes may be found here www.instructables.com/4-Wire-Horizontal-Plotter-Design-Notes/

You're welcome :) You may find my design notes of interest www.instructables.com/4-Wire-Horizontal-Plotter-Design-Notes/

According to this data sheet www.digikey.ch/htmldatasheets/production/1647438/0/0/1/as5600-datasheet.html the maximum sampling rate is 150uS. A maximum angular velocity is not given ...

@@qualityphotos1 considering its 12 bit resolution, we have an angular resolution of 0.088 degrees. So, ideally speaking at that sample rate we would have 1.629 rpms ... which make it not good for continous angular measurement.

@@CrisDFF30917 According to the product data sheet the AS5600 is "is designed for contactless potentiometer applications" which confirms your calculations.

Follow the link below the video. The code is in my article "Mind Control 3: EEG monitor"

Assume two points A and B. The time to travel from point A to point B against the wind will be: Time1 = Time-in-still-air + windspeed. The time to travel from point B to point A with the wind will be: Time2 = Time-in-still-air - windspeed. Subtract the times: (Time1 - Time2) = (Time-in-still-air + windspeed) - (Time-in-still-air - windspeed) Solving windspeed = (Time1 - Time2)/2 ............... (1) If the sensors are optimally spaced then equation (1) will be valid. Otherwise the equation (1) becomes: windspeed = (Time1 - Time2)/K ............... (2) where K = calibration factor In my case the sensor spacing worked out at (Time1 - Time2)/3 Helpful information: The speed of sound in dry air at 20 degrees Celcius is 343 m/s = 343000 mm/s. A windspeed of 1km/hr equals 0.277778 m/s = 277.778 mm/s. One wavelength at 40kHz = speed-of-sound/frequency = 343/40000 = 8.575 mm. Arduino microprocessors can only resolve time to 1us. A more sensitive method is to measure the phase change between the transmitted and received waveform.

@@qualityphotos1 thank you very much for the info!

@@qualityphotos1 I didn’t get how u calculated the k factor 😕

Thank you :)

:)

The Hall effect transistors are rated at 10000 rpm ... but the speed limit is likely to be less due to the amount of processing. I have uploaded a construction article to www.instructables.com/Neodymium-Angle-Encoder/ which should appear in the next few days pending a review. The article contains all of the design equations, code, and 3D *stl files.

Thank you :)

The circuit is designed to work with two Big Easy Drivers. which have A4988 drivers and support circuity on the same printed circuit. If you are referring to the A4988 plugin modules that plug in to a Arduino CNC motor shield then the short answer is no ... not without messing around ... as the support circuitry is missing and the logic levels are different. An Arduino CNC motor shield into which you plug the A4988 modules should work (I've not tried) but you will likely have to change the Arduino pinouts to match the shield and play with the M1,M2.M3 jumpers as they are pull-up on the Big easy driver and pull-down in the separate A4988 modules ... I leave this for you to work out. The simplest thing to do is use the Big Easy Drivers as shown in my construction article www.instructables.com/CNC-Dual-Arm-Plotter-Version-2/. You may also find my article www.instructables.com/CNC-Drawing-Arm/ of interest ... it uses the same components but with a different mechnical arrangement.

@@qualityphotos1 Thanks for your comment, I've actually implemented the plotter myself but I'm using a completely different microcontroller with the A4988 drivers and implemented my own different functions, I've been referring to your code and relevant equations, all the answers match up when given specific coordinates. Using the NEMA17 motors with 16th stepping, the robotic arm lengths of approximately 200mm length (400mm total), my YAXIS is 300mm when at max length (corner of page). Spacing is 110mm between M1 and M2, offset 1 is 105 and offset 2 is 215. If I run your example of abc(), how come it hovers around and moves slowly around my assumed (0,0) position? Like it doesnt move to the centre of the page. Additionally, I've had to subtract by PI for the ang1 and ang2 calculations? Otherwise the angle exceeds the range and steps beyond max range. Could it be because of dimensions? Thanks so much

@@Aaron-hs4gj The effects that you describe could be due to any one of the changes that you have made. My plotter, as described in my instructable www.instructables.com/CNC-Dual-Arm-Plotter-Version-2/. doesn't exhibit these effects. Regarding your plotter dimensions ... the plotting area in my design is some distance below the motors. The reason for this is that the pen must reach all four corners without mechanical restrictions such as arm lengths or running into the motors. When marking the corners ensure that the elbows have a slight angle to prevent them accidently bending the wrong way. All measurements reference the lower left corner of the plotting area.

@@qualityphotos1 Thanks, I will take your comments into account

@@qualityphotos1 Hi, after taking your comments into account, I managed to successfully implement it, however, I am going into issues regarding linearity issues as in won't go in straight line. I propose a solution mSo basically while either motor has fewer steps extend that motors running time until it matches the precise time that the other motor finishes that move. this ensures synchronisation. I haven't implemented the calculate_delays equivalent function but I presume this is what this function is doing precisely? Kind regards

Short answer ... it won't. The anemometer is intended for fixed land-based operation. A full description, including construction details and code, may be found at www.instructables.com/Laser-Anemometer/.

Providing the plotter is on a level surface, and the wheels don't slip, it shouldn't matter which orientation the plotter is placed. Not certain what you mean by "approriate feedback system", My plotter has no feedback system in which case any problem is one that you are introducing.

Thank you :)

Measure the transit time in both directions and subtract the readings. In one direction the windspeed adds to the transit time of sound in still air. In the other direction the windspeed slows the transit time. (Still + airspeed) - (Still - airspeed) = 2 x airspeed. Sound in travels at 343.2 m/s in still air. 1 km/hr = 0.277778 m/s. Just do the numbers.

Otherv methods include ... a wind vane and a load cell ... or a Pitot tube ...

@@qualityphotos1 What I want to do is to measure the speed of the wind blown by a fan. to place it in front of the fan, with a distance of 15 cm between the sensors. If the margin of error is not very high, I think to implement it. Could you please describe it to me step by step?

@@berat8949 I already have ... see my first answer

No ... unless you know the motor-shaft start-up angle.

@@qualityphotos1 how to make it like a servo? Becaise i need if do this stepper go 80deg, if do that stepper go 120deg etc sir

Once calibrated the last position needs to be remembered whenever the encoder is switched off otherwise you will need to recalibrate. I leave that up to you. A standard servo would be simpler.

@@qualityphotos1 so donu mean the encorder when switch off the angle will change??

The memory contents of an arduino are lost whenever the power is switched off. What you are trying to do is only possible if you save the last shaft position to some battery backup device before you switch off the arduino AND do not move the shaft while the arduino is off.

Thank you for commenting :) Adding a TFT display should be possible The code and construction details are published here www.instructables.com/Simple-Capaitance-Meter/

@@qualityphotos1 Please make an additional video where you add the display for the stand alone capacitance meter. Also, add the ability to change out the capacitor value to measure big capacitors too!!

@@Forensic1Man I'll add that to my list of things to do ... but it is likely to be some some ;)

Thank you for commenting :) The construction details and code may be found here www.instructables.com/Voice-Controlled-Robot-Hand/

Thank you for commenting :) The resolution is determined by the reference capacitance ... the smaller the better but at the expense of range. The following instructable www.instructables.com/Absolute-Angle-Encoder/ has a graph showing a typical ADC count. The code and construction details for this project are published here www.instructables.com/Simple-Capaitance-Meter/

@@qualityphotos1 The resolution is determined by the reference capacitance - yes I understood that 😎

Construction details and code have been uploaded to www.instructables.com/member/lingib/instructables/ but will not appear until they have been accepted by the Instructables website.

Now running on Instructables

I have not encountered that error so cannot comment. My code was written using processing 3 ... perhaps there is a slight incompatibility with Processing 4 ?

Not yet 😕

@@qualityphotos1 ,👋

Click the link in the description beneath the video

The anemometer uses the Pythagoras formula sqrt(sq(dX) + sq(dY))to calculate the wind direction from dX and dY. If the pipe deflection is proportional to wind-speed then wind-direction multiplied by an arbitary scale factor gives us the wind speed. Methods for calibrating the anemometer are discussed in www.instructables.com/Laser-Anemometer/

@@qualityphotos1 hello, realizing your project(laser anemometer). After running for a certain period of time I get this error message: Processing 4 -> Error, disabling serialEvent() for COM6 null What is the reason for this error? How can I fix it?

Thank you for your interest in my plotter. Construction details and code is in this link www.instructables.com/CNC-Plotter-1/