oracid

No. The RC standard servo output is a usually a 25T gear. Like here, https://fr.aliexpress.com/item/1005004505256614.html?spm=a2g0o.productlist.main.11.2f875184YJ5Yxm&algo_pvid=2f894f45-2c7e-42d1-8853-ac86e4b6d972&aem_p4p_detail=202301130500174375319238696840000616623&algo_exp_id=2f894f45-2c7e-42d1-8853-ac86e4b6d972-5&pdp_ext_f={"sku_id"%3A"12000029399308713"}&pdp_npi=2%40dis!EUR!23.71!12.8!!!!!%40214527c616736148179144989d0702!12000029399308713!sea&curPageLogUid=4IvBTBaz2Rw4&ad_pvid=202301130500174375319238696840000616623_6&ad_pvid=202301130500174375319238696840000616623_6

As you know, I don't use anymore Lego servos but standard RC servos. One thing should be great is a few RC standard servo arms. Let say thin beams from 3L to 9L. Of course, I know the output RC standard servo gears are not all the same, but the 25T is the most usual. Thanks again for this thread !

@howitzer Thanks for your comments. The 1L beam already exists, it is the ref.18654, BrickLink Reference Catalog - Parts - Category Technic, Liftarm In my opinion a 50L beam will not be fragile. I have an ABS 50cm ruler, and I can say it is not fragile at all. Anyway, it is up to everyone to decide what he want to do with its parts. If the section is too small for a large piece, then it is enough to increase its area. The problem is that Lego does not offer the minimum number of parts that can be found in the assembly section of a DIY store. It is true that Lego offers a multitude of parts that cannot be found elsewhere, but not all the basic parts for doing mechanics. If you go to a big DIY store, you'll find screws of all sizes and diameters. This is what I would like to find in the Lego catalog.

Thank you for this very interesting topic. To get into, here are my first proposals: - thick beams of all lengths, from 1L to 50L. - thin beams of all lengths, from 1L to 50L. - pins from 1L to 6L, without any stopper. - all pins, with friction, and without friction.

The objective here is to make a fast, light and robust little quadruped to compete in the TRR (Toulouse Robot Race) 2022/23. This is now made possible thanks to Geekservos. At the TRR, the speed track is reserved for rolling line-following robots. The challenge for me is to play in the big leagues, but with a quadruped equipped with the Huskylens camera. Here is the first test, I hope there will be others.

Thank you @Toastie I don't know what is RIS1.0. Could you tell me about it ? Oh, yes, I had 3 dogs in all. But not anymore to day. Here it was a post Covid TRR with a small circuit. Next June, a big circuit is planned, with many more people. Things are like that ! Always faster, bigger, stronger. . .

Thanks. I hope it will be faster in June 2023, at the next TRR, on a bigger circuit.

The training day at the Toulouse Robot Race.

Here is the video of the second test I did at 9 p.m. to avoid sun glare. New are the long neck and the slippers.

I think there would be no problem going the other way, but it's a good test to do. Yes, the future TRR is planned inside, but despite everything, if there is too much light, it's a disaster. That's why I did the test in my garage. Yes, the microcontroller board is an Arduino Nano and the camera is a Huskylens. I did a very similar 12 DOF, but without the camera, here, 12DOF-Q-3 Quadruped whith GeekServos - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums

It's possible with 2 motors, even 2 Lego motors, I've done it before, but with 2 servos (angular or continuous rotation), I think it would be more complicated. No two servos react exactly the same. There could be opposing stresses that would accumulate and in the end destroy the 2 servos. But it would be interesting to test this, indeed. I will do that, one day. Good idea !

The Green is a servo. That means that it has an internal electronic driver like any servo. It can be drived with an RC servo signal. So you can use it on a shield with the Servo Arduino library. With value from 90° to 0°, it goes in a direction, and with value from 90° to 180°, it goes to the reverse direction. The speedest is 0° and 180°. The Red and the Blue are DC motors with only 2 wires. They are not servos. The Blue has more torque but less speed than the Red. You can't drive them like RC Servo. You can connect them to a Shield to a PWM pin to modify the speed, but you can't modify the direction. If you want to, you need an external DC motor driver and 2 pins connection. Hope this help you. I know nothing about this.

There is the Grey GeekServo which is a real 360° servo that I have done a thread here, https://www.eurobricks.com/forum/index.php?/forums/topic/190129-geekservo-real-360°-programming/ And there is a Green GeekServo which is a continuous rotations servo, you can see an example here, https://www.eurobricks.com/forum/index.php?/forums/topic/191444-rolling-robot-chassis-ugv-to-start-in-robotics/ There is too a Red GeekServo which is not a servo but a DC motor.

Hi @2GodBDGlory. I'm not sure I can help you, but allow me a few remarks. - Unfortunately, servos rarely work in 3S (11V). In your car, there is probably an electronic circuit that lowers the voltage to 5V. - if your wires are colored, there is certainly a red wire and a black wire for the servo supply. You must connect these 2 wires to the red and black (brown) wires of your Geekservo. - now, there are 3 wires left that you must successively connect to the orange wire of the Geekservo and test each time. I hope this will help you a bit.

Thanks guys for your support. Yes, @grum64, I understand your sentiment. Robots can be the worst and the best, but isn't our worst enemy most often ourselves. @gyenesvi, Lego is an amazing medium for creativity, but it's just pieces of plastic. Why make it a dogma borrowed from religiosity? I forbid myself nothing. I cut, I paste, I print and above all, I use everything that could easily increase my creative ambition.

Thanks to GeekServo, it is now very easy to make a good-sized rolling robot for a reasonable price. This robot is not all terrain and it will not climb stairs, but as you can see, it can already overcome a 6cm obstacle. It is extremely easy to make and I hope that this chassis will encourage anyone wishing to start in robotics to get started. The code is very minimalist, and a single function of 3 lines allows to execute all the movements. https://github.com/oracid/Rolling-Robot-UGV

In this new video, I show a Robot Chariot with the HuskyLens AI camera following a line. Here the speed is greater than with a tank and a PID shows its efficiency. As usual, I associated Lego, Arduino and servo RC technology. This association allows achievements without constraints and without limits.

Yes, you are right, but the problem is what is the method to get good value for P, I and D.

Sorry, I don't understand.

Thank you. I've always thought that the fewer lines of code, the more readable it is. It is for this reason that when several instructions relate to the same objective, I group them together on the same line. When all the whole code fits on the screen, I'm very happy. This way is considered heretical, but I will not change it. Unfortunately, this is not possible with Python. Pity.

The code is 30 lines long. You can see it at 1'53". The link is on description, but here it is, https://github.com/oracid/Chariot-Robot-HuskyLens-Line-Follower-with-PID/blob/main/Chariot-LINE_TRACKING-V4-ref.ino Thank you, but I should work still a little bit.

Here is a new app for my Mini Tank. This is a line follower with a HuskyLens. I skipped the PID, I did my own thing and in the end with less than 25 lines of code, I'm not unhappy with the result. Hope you like it.

In this video, I show how to follow a line as closely as possible. The idea is to continue the current bend, but that doesn't work with a right angle, to the left, when you have just turned right.

Thank you. The Geekservo are in different versions : - grays are ordinary servos with a range of 0 ° to 180 ° - greens are servos with continuous rotations with a reduction of 1/140, 160rpm. - blues are continuous rotation servos with a reduction of 1/300, 90rpm. - reds are DC motors, not servos. The set operates from 4.8V to 6V Here are some links: https://fr.aliexpress.com/item/1005003469259929.html?spm=a2g0o.productlist.0.0.79166596yg1y1n&algo_pvid=8a229cfb-707b-4e9e-ad96-ac3152bd5fc9&algo_exp_id=8a229cfb-707b-4e9e-ad96-ac3152bd5fc9-11&pdp_ext_f={"sku_id"%3A"12000025926811754"}&pdp_pi=-1%3B83.06%3B-1%3BEUR+51.48%40salePrice%3BEUR%3Bsearch-mainSearch https://fr.aliexpress.com/item/1005003078987958.html?spm=a2g0o.productlist.0.0.79166596yg1y1n&algo_pvid=8a229cfb-707b-4e9e-ad96-ac3152bd5fc9&algo_exp_id=8a229cfb-707b-4e9e-ad96-ac3152bd5fc9-6&pdp_ext_f={"sku_id"%3A"12000023925828260"}&pdp_pi=-1%3B82.72%3B-1%3BEUR+51.48%40salePrice%3BEUR%3Bsearch-mainSearch https://fr.aliexpress.com/item/1005001419298190.html?spm=a2g0o.productlist.0.0.79166596yg1y1n&algo_pvid=8a229cfb-707b-4e9e-ad96-ac3152bd5fc9&algo_exp_id=8a229cfb-707b-4e9e-ad96-ac3152bd5fc9-2&pdp_ext_f={"sku_id"%3A"12000016028199434"}&pdp_pi=-1%3B77.66%3B-1%3BEUR+51.48%40salePrice%3BEUR%3Bsearch-mainSearch https://fr.aliexpress.com/item/1005003469180567.html?spm=a2g0o.productlist.0.0.79166596yg1y1n&algo_pvid=8a229cfb-707b-4e9e-ad96-ac3152bd5fc9&algo_exp_id=8a229cfb-707b-4e9e-ad96-ac3152bd5fc9-13&pdp_ext_f={"sku_id"%3A"12000025926228938"}&pdp_pi=-1%3B82.78%3B-1%3BEUR+51.48%40salePrice%3BEUR%3Bsearch-mainSearch

The goal was to make a robot base without up nor down to get out of a ravine, for example. On Mars of course ! What I like most about this project is its funny look.