pasquentmax

Hello everybody ! You want a perfect lawn ? to repair your lawn ? Use my grass seeding robot, the world’s first domestic robot that detects holes in the lawn and sows grass inside ! * The robot is autonomous, it has two modes of movement, a grid mode when it can come to bump against a fixed wall and canvass effectively with the gyroscope (this is the case in the video, zeroing at each contact with the terrace) or a random mode, basic vacuum cleaner style. * Bluetooth transmits an instant measure of lawn density in % (the 100% calibration being the dense lawn), the average density in % and the number of holes detected. At start-up the operator transmits a minimum hole size via bluetooth to be detected. (in % of the image size is 10 cm x 6 cm) * 3 Ev3 brains to do this project * It detects holes with a Pixy Cam 2 camera, scarifies (just for demo, not effectively, I didn’t equip it with metal spikes) and sows seeds in the hole. * In summary the final result, to discover in the video, is a robot with 6 motors: 4 motors of drive of the wheels mecanum, 1 motor for the control of the scarifier and a motor with endless screw for the distribution of seeds and 8 sensors: 1 gyrsocope, 2 ultrasonic, an IR, 2 contacts, 1 pixycam and a light detector for seed level.

But...no more daisy chain, no more data logging, no more screen, no more live debugging...It's the death of mindstorms

The screen of the EV3 is very nice. Personally I use it a lot as in this realization : One could have hoped for a color screen ... that is a disappointment.

Good morning to allI would like to share here my latest creation, which is a new concept, a versatile robot with two unrelated but compatible tasks. On the one hand the robot is a robot that makes your parquet shine and in a few seconds you turn it into a toy for your favorite animal or child. The robot consists of two Ev3 bricks that handle 4 motors that fit 4 mecanum wheels, 2 motors that drive the felt pads and the ball throwing system, 4 ultrasonic sensors that detect obstacles in the movements, a light detector for the contactless control of the robt, a light detector for the detection of the bullet under the robot, a gyroscope for orientation and a pixy2 camera for ball detection. The domestic robot can polish almost 800m² in an hour, obviously the batteries have to be recharged. But the difficulty is in chasing the ball and in managing different lighting in a room. What do you think of this achievement?

He’s gonna go back and go through all the open cells... and when he does all that, it’s gonna be the big bug. I didn’t handle the situation, I could have blown it up.

No it does not use this algorithm, it gradually condemns the boxes and makes random choices when there are several possibilities. And he never returns to a condemned box. He eventually finds the way out, it goes faster on average than the hand to the left or to the right. his is the starting point, he knows that entry is a forbidden exit and so it is like a wall. It is normal that he condemns the cell.

Done

Thanks !!! but what do you expect excatly by screenshot ? from youtube video ?

Thank you very much. This is true for the remark I could not have stopped in every cell, but I had problems with the mecanum wheels and their drift; it was easier to redo a RAZ every time. The problem is there’s not much room between the robot and the wall. Probably spending a lot of time I would have managed to do it, but the most interesting was the maze resolution algorithm and the transmission to the other EV3. Thank you for your encouraging comments.

I would like to share with you my latest achievement, a maze solver. The maze is 4m² and has 100 boxes of 18cm x 18 cm. The robot has 4 ultrasonic detectors to analyse each case and mecanum wheels driven by 4 vertical engines. The whole is controlled by an EV3 brick hidden inside. You can follow the robot’s path on a second EV3 brick by bluetooth as well as its analysis which may lead to prohibit certain boxes. The robot measures 15cm x 15 cm and it is therefore difficult to move accurately in the labyrinth without hitting the walls. That was one of the difficulties, but I wanted it to be aesthetic and therefore with a body. When the robot arrives in a cell, it analyzes the 4 faces. If it sees 3 walls it blacklists the cell. If there are 2 walls and a forbidden cell next to it, it also blacklists the cell. At each cell it updates an array data of 100 datas, 1 per cell. In this array we will find all the informations about the path of the robot. In case of iddentic choice the robot randomly chooses its direction.

Hello everyone, I want to share with you the construction of an autonomous robot for a contest, a course filled with obstacles that ends with a return of dice... The robot has two bricks Lego ev3, 6 motors and 8 sensors: 2 ultrasound, 1 IR, 2 gyroscopes, 2 mechanical contacts, a light detector... And especially great mecanum wheels for movement and precision...

Hello, sometimes the die doesn’t come out, once on about 500 draws, but it never locks. After 12 hours of throws lego mechanics begins to suffer a little and to disrupt. I’m aiming for 24 hours. Hello, yes you are right, but my essays show that it takes thousands of draws to be sure statistically that the die is unbalanced!

Hello, what are the advantages of programming in python? does this give other possibilities to the ev3 lego?

Hello everyone, if like me you dreamed of throwing a die for hours and hours to see if it is piped then this lego machine Mindstorms is for you! 4 throws and read dice per minute, or nearly 6,000 throws per day. Then simply transfer the file to excel and analyze the results!

Fantastic ! Where do you buy your steel axis ?