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use 755 22000RPM 12V motor (good) - has thread 5mm (sometimes 8mm) - also can put cutting line between two nuts

in practice NO - I use solar energy to load lithium batteries

Thank you! Hopefully you can find all the information needed on the robot website, there you can also post questions to me: robertmalmstrom5.wixsite.com/robelibob

Tackar! Jag har inte testat att köra den tills den stannar. Men jag ska testa och återkommer med ett svar.

ENG: Congratulations on this great project, which I will continue although with some changes since I have an old robotic lawn mower and I will take advantage of the housing and motors. I have doubts if you are using the A5 input, for the second detector of the perimeter cable. If it is free I would like to add a measurement of the battery; When the robot is running low, look for the perimeter cable and return home to start charging. Will there be another way to detect that the battery is low? Greetings from Galicia. Es: Enhorabuena por es gran proyecto, que voy a seguir aunque con algunos cambios ya que dispongo de un robot cortacésped viejo y aprovecharé la carcasa y motores. tengo dudas de si estas usando la entrada A5, para el segundo detector del cable perimetral. En caso de estar libre quisiera añadir una medida de la batería; cuando se estea agotando el robot busque el cable perimetral y vuelva a su casa, para iniciar la carga. Habra otra forma de detectar que la batería esta baja? Saludos desde Galicia.

@@vicentech1718 Hi Vincent, I am using the A5 for the second perimeter sensor. But maybe you can remove one ultra sound sensor as they are using two analog io pin each? Regards Robert

Thank you Priska!

Thank you, yes you can use the same motor without decoders and the have a lower price. You can find on Amazon if you use the link and look for alternatives. You will the need to remove the code that uses the decoders to set the motor speed.

​@Robert Malmstrom , thank you. Can you please advise the line numbers that i need to delete?

Hi, in the void loop() function you should remove or comment out this function call: ReadMotorSensorSpeed();

@@robertmalmstrom942 thank you

@Robert Malmstrom just to confirm if it is this part only or anything else? // Is the robot going forward? if (m iDirection == ciForward) { forward (0); ReadMotorSensorSpeed (); }

Thank you Delphy, it was alot of work but really fun project.

Hi Derrick, you find schematics on the robot webpage: robertmalmstrom5.wixsite.com/robelibob

Hi, you find the source code for both the robot and the perimeter wire base station here: robertmalmstrom5.wixsite.com/robelibob/source-code A complete simulation diagram is a really good idea. I will try to find time to do that and add it to the robot site.

Hi Claudio, sorry for late response. For the start/Stop switch I used a 10k pull-down resistor and in the source code you find this parameter: int m_iPinStartStopButton = 12. So the button is connected to pin 12 and when you press the button it switches between runnig the robot and not running (bRunning = !bRunning;) and this controlls both the wheels and the blades. So if the robot is running and you press this button it should come to a complete stop including the cutting blades.

Hi, you are right. At one point it passes the perimeter wire and then gets back in. I think I need to add software filtering of the sensor signal as the brushed cutter motor adds alot of noise which adds both false positive and false negative reading of the pulse.

Hi Christophe, thank you for pointing out this error in the video. It should be a 10mH coil and as you write you should add a 100nF capacitor to filter out other frequencies. I have added corrective text in the video and updated the schematics on the robot website: robertmalmstrom5.wixsite.com/robelibob/electronics

I'm working on it and will update the Robot website very soon.

The schematics for the Perimeter sensor amplifiers and the Perimeter Station are now available here: robertmalmstrom5.wixsite.com/robelibob/electronics

Thank you, I will very soon add schematics for the Perimeter station on the website. Working on it😅

I have now added the schematics here for the wire sensor amplifier and the Perimeter station: robertmalmstrom5.wixsite.com/robelibob/electronics

@@robertmalmstrom942 Quite excellent. A few steps are already possible with this. My basic structure is set, the boards are installed. The coil for wire detection is supposed to be an inductance of 1mH and not 1000µF? Am I right?

@@barananama2507 The coil inductance should be 10mH. I have added a corrective text in the video and changed the schematics on the robot website.

Thank you, the tupperware came from an early idea to make the electronic cases water proof with the lid, but I gave up this idea. I think you learn more when you build your self from all the problems you bump in to.

Thank you! I will soon put up more information about the perimeter wire system on the robot webpage. Link is in this video description.

@@robertmalmstrom942 Great ! Looking forward to see more of this !

@@PhG1961 Philip, I have now added schematics and updated the source code on the robot website: robertmalmstrom5.wixsite.com/robelibob

@@robertmalmstrom942 Really cool !!

Hi John, thank you for following my project. I used a scrap piece from our ceiling renovation that i sawed and bent according to my early robot design CAD. If you have a local metal shop I would go there and ask if the have scrap pieces that you can buy.

I connect the perimeter sensor to A4 and A5 but I have not yet updated the source code on the Robot website. Will do soon.

Hi, I have now updated the source code to the latest version that handles left and right perimeter sensor and the robot now turns in different directions dependent on if it´s the left or right sensor that detects the wire first: robertmalmstrom5.wixsite.com/robelibob/source-code

Thank you Paul. I use a very simple "navigation" algorithm and that is that the robot drives straight until it detects the perimeter wire pulse on the left or right sensor. And when it does that it randomly turns right about 30-45 degrees if it was the left sensor that first detected the wire or randomly turn left it it was the right sensor that first detected the wire pulse. This alorithm needs to be improved as it some times escapes in wire corners with this simple algorithm.

Thank you Philip, in this video I used a simple robot arm kit but I added wireless control of the arm with my Wear OS watch. Fun but not much practical use: th-cam.com/video/V_Gzga2W-WE/w-d-xo.html

I will say that the robot looks great, I am looking forward to try building it

Hi Hyper, if you add an encoder or an amp sensor to the cutting motor you should be able to detect when the cutter has to work harder and use that as an indicator of uncut grass. You could then also make the robot stay longer in that area until it doesn´t detect high amp or lower motor rpm any more.

Hi Szymon, I run a simple 5KHz square pulse. You can find more informaion here (for example, source code and electronic schematics): robertmalmstrom5.wixsite.com/robelibob

Thank you Philip, you can download the robot CAD file here: robertmalmstrom5.wixsite.com/robelibob/cad

@@robertmalmstrom942 Thank you so much ! This might be handy for a second build, much smaller (and therefore cheaper...) !

Stephen, please take a look at the Robot website that I´m working on for this project and under Build Step you will find more details on how it was built: robertmalmstrom5.wixsite.com/robelibob

I have now added more schematics here: robertmalmstrom5.wixsite.com/robelibob/electronics

Hi, sorry for not responding. I plan on making a more detailed video with all details on how i built the robot. Would you like to see schematics, part list with links to providers and CAD? Maybe also challenges that I ran in to?

@@robertmalmstrom942 Thanks Robert, I think it is clear from the comments so far that people love your project, and would love to see anything more that you can show. We would all soak up absolutely anything you have to offer. :o) I certainly would.

Thanks brother. You're sharing some great stuff. Sniper I read the comments and tried the code. There are some errors of "STRAYS" that's the reason I asked. It looks like a raw sketch.

I have now added more schematics here: robertmalmstrom5.wixsite.com/robelibob/electronics

Hi Shail, I have in my plan to add a rain sensor to the robot so it avoids cutting the grass during rain because that will just make a mess of your lawn. And runnig a ultrasonic sensor in heavy dust, rain, or snow reduces acoustic energy and can diminish the beam or reduce the maximum range of ultrasonic sensors. But in light rain it should be fine.

@@robertmalmstrom942 or buy car parking ultra sensor (3 times more expensive but waterproof)

Hi Isidro, I use wheels that has a diameter of 140mm and I actually took them from an abdominal trainer:) But the important part was the DC engine gear box ratio to get 30rpm that gave the robot a perfect speed and torque with this wheel size. I bought the DC engine including gearbox and encoder for good speed control at Amazon for about 18$ each. The caster wheel is 50mm and just a standard wheel I bought at the closest tool shop. I haven´t seen any problem with the caster wheel getting stuck so far.

Hi Isidro, please take a look at the Robot website that I´m working on with more details about this build: robertmalmstrom5.wixsite.com/robelibob

Thanks!, I plan to create a more detailed video that shows schematics. I use a second Arduino to create a 5Khz signal that controlls a L298 DC motor driver that's connected to the wire. I needed to add capacitors to make the wire signal more sinus shaped so that it's easier to amplify the signal when it is registered by the coils on the robot.

John, please take a look at the Robot website that I´m working on for this project. Under Build Step you will find more information about how I got the perimiter wire system working: robertmalmstrom5.wixsite.com/robelibob

Hi Rui, you'll find all info on my robot website: robertmalmstrom5.wixsite.com/robelibob

Thank you Peter, you find more detailed information on the Robot website: robertmalmstrom5.wixsite.com/robelibob

Hi Tracy, I will soon setup a web page with more detailed information about this project where you should be able to find part list and links to where I bought the parts.

You can now find a first version of the part list in this project website that I´m building now: robertmalmstrom5.wixsite.com/robelibob

Hi, I´m making a follow up video with focus on the perimeter wire system. A teaser video can be found here: th-cam.com/video/ODAqQ4BB780/w-d-xo.html

Please take a look at the Robot website that I´m building for this project for more detailed information here: robertmalmstrom5.wixsite.com/robelibob

I have now added schematics here: robertmalmstrom5.wixsite.com/robelibob/electronics

@@robertmalmstrom942 Thank you!

Hi Kevin, I´m currently building a website for this project and there you can find the full robot source code: robertmalmstrom5.wixsite.com/robelibob