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oracid

Eurobricks Knights
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  1. oracid
    If the battery is empty, you run on the charger. I have a good quality battery charger. It recommends expressly to turn off use while charging. Electronics is a complicated discipline. If the goal is learning it, then anything is possible. If the goal is to make a quadruped with proven means, then I suggest simplicity. A quadruped is already very complicated in itself, even if you have no problem with the electronics.
  2. oracid
    @Mikdun. Sorry for my English. In absolute terms, your arguments are perfectly admissible, but @glowytheglowbug seems to be a beginner and I think it is better to use proven components and methods to avoid accumulating possible problems.
  3. oracid
    It is not good to use separate Li-ion batteries when could be high intensity. That is why in bikes or scooters they are soldered. Of course you can charge the battery even if it is connected to the robot, but the robot must be off. As you can see in the link, the battery has two connectors. The red one could stay always connected to the robot, and the white connector is for charging.
  4. oracid
    - first of all, you must not make the charger yourself. - the usb cable must be only connected from a PC. - you must not charge and use the battery simultaneously. - in my opinion, to buy single 18650 bateries is not not a good idea. - you can buy Li-ion battery but with the good charger. - here the link for the Li-ion 2S (7.4V) and charger : https://fr.aliexpress.com/item/1005005465159863.html?spm=a2g0o.detail.1000014.11.2e68CAMrCAMrHH&gps-id=pcDetailBottomMoreOtherSeller&scm=1007.40000.326746.0&scm_id=1007.40000.326746.0&scm-url=1007.40000.326746.0&pvid=77e76235-ad2d-4550-9a02-10b7ba83e9c3&_t=gps-id:pcDetailBottomMoreOtherSeller,scm-url:1007.40000.326746.0,pvid:77e76235-ad2d-4550-9a02-10b7ba83e9c3,tpp_buckets:668%232846%238109%23214&pdp_npi=4%40dis!EUR!4.89!2.94!!!5.23!!%40211b61a417011784313726401ee6bd!12000033192447594!rec!FR!871422066!
  5. oracid
    I have used these servos very often in my projects. I invite you to refer to them. As I already said above, you need an Arduino Nano, a shield and a 7.4V/8.5V (2S) battery. Above you have all the links you need.
  6. oracid
    I guess your DC power is not with the good voltage. As you can see in this two links, it is good that the DC power voltage is 12V. Arduino Uno Rev3 — Arduino Official Store Arduino Nano — Arduino Official Store In addition, the Uno must be powered by its PC socket and the servos must not be powered directly by the Uno. It is for these reasons that it is important to use a SHIELD.
  7. oracid
    The DC power (link above) is very cheap and you can directly power your Arduino Uno with which it already contains a voltage regulator. The regulators and capacitors would cost more .
  8. oracid
    You can do that. You cut the end of the DC wire. Then you cut the JST connector from the JST/ PH2.0 wire. Then you connect the 2 wires. But with a needle, you must invert the 2 little connectors of the PH2.0 connector. This is very important.
  9. oracid
    No, you can't use the a USB-A to PH2.0 plug. As I said before, with a battery, you need to use a JST to PH2.0 adapter, the link is above, but be carrefull, the GND and V are inverted on the shield. With the wall DC power, you need to make your own adapter. I have not found a DC to PH2.0 adapter. All is explain above, with the right links.
  10. oracid
    No ! Don't do that. Anyway, the USB-A is on your PC. I don't know about British plug.
  11. oracid
    Excellent ! It's a first step. You can start your learning with the Arduino Uno while waiting to receive the Nano, the shield and the battery. Starting a learning experience with a kit is a very good thing. Be careful, during your learning, do not directly connect a GeekServo to the Uno. A RaspBerry Pi is a PC, with the complexity of a PC. A multitude of programs run simultaneously, whereas on a microcontroller board like the Arduino, only one program runs, the one you wrote. Good luck with your learning.
  12. oracid
    Sorryyyyyyy ! - Of course, the program provides for the speed and repetition of the movement of each paw. - I don't understand your question. The operation of the servos is based on the use of a dedicated library, Servo.h - No, the Arduino Nano is an 8-bit microcontroller, perfect for getting started. It does not integrate wifi or Bluetooth. - To get started, you need to watch a tutorial on Arduino. There are many on YouTube, in all languages.
  13. oracid
    - Bien sûr, le programme prévoit la vitesse et la répétition du mouvement de chaque patte. - Je ne comprens pas votre question. Le fonctionnement des servos est basé sur l'emploi d'une bibliotèque dédié, Servo.h - Non, l'Arduino Nano est un microcontroleur 8 bit, parfait pour commencer. Il n'intègre ni wifi, ni Bluetooth. - Pour commencer, il faut que tu regardes un tutoriel sur Arduino. Il y en a beaucoup sur YouTube, dans toutes les langues.
  14. oracid
    You need to do a bit of soldering : - From the wall, you have have the charger with is DC (5.5*2.5 / 2.1) male connector. 110-240V DC 5V 6V 8V 9V 10V 12V 15V 0.5A 1A 2A 3A adaptateur d'alimentation universel chargeur adaptateur Eu Us pour bandes lumineuses LED - AliExpress - Then you need a femal DC (5.5*2.5 / 2.1) Connecteur d'alimentation CC mâle et femelle, écrou de prise jack, montage sur panneau, adaptateur d'alimentation CC, 5.5x2.1mm, 3.5x1.3mm, 5.5x2.1mm, 10 pièces - AliExpress - You must cut the red side (JST male-PH female) of a wire connector : Câble adaptateur de prise de batterie Lipo, connecteur de charge mâle et femelle, chargeur de batterie modèle RC, 22AWG, JST à PH2.0, 1S, 10cm, 10 pièces - AliExpress - Then you must solder the femal DC connector to the cutted side of the wire connector. - Be very carreful the side of +V and GND are inverted on the shield. You must switch the +V and GND of the wire, using a needle. - about code you just need to copy my code in C. - I don't understand your worry about gears and motors. I use servos. No need of gears.
  15. oracid
    - Unfortunately, if you want a DC to PH2.0 cable, you will have to make it. But I think you should get into the habit of working with battery. That's what I do. - Yes, the Arduino Nano is powered through the shield. - You have the link to Github in the video description. I put it back here: https://github.com/oracid/IK-Inverse-Kinematics-for-3DOF-quadruped-robot-leg/find/main - There is a file corresponding to each movement. In all 4 files, there is a function IK(x,y,z). This function is identical in each file, except for the ending which is movement specific, from the comments: ################ Start Inclined Plane ################ ################ Start Screw ################ ################ Start Zigzag ################ ################ Start Circle ################
  16. oracid
    You can use any wall power that has max 12V output. You must connect this wall power to the shield. 110-240V DC 5V 6V 8V 9V 10V 12V 15V 0.5A 1A 2A 3A adaptateur d'alimentation universel chargeur adaptateur Eu Us pour bandes lumineuses LED - AliExpress But you need an adapter to connect the DC connector to the shield connector. Il you have chose the shield with DC connector then no problem. But if you have chose the shield with PH2.0 connector then you need to adapt with a bit of soldering. What about this video ?
  17. oracid
    If you prefer a powerbank, you will need at list 7V (2S) to power an Arduino Nano. Tell me about the feature of your powerbank. If you are talking about the TRR video, I used an HuskyLens cam which is very powerfull, thanks to its AI.
  18. oracid
    This is a very good idea starting with Arduino and GeekServo. You will know how freedom is great. - If you followed my topics you could see I choiced the Arduino Nano which is very small and cheap. Nano-Blue-welded : https://fr.aliexpress.com/item/1005001636568464.html?spm=a2g0o.order_list.order_list_main.563.34e45e5br3kwcW&gatewayAdapt=glo2fra -To make the connections easier, you must use a shield like this one : https://fr.aliexpress.com/item/33063354279.html?spm=a2g0o.order_list.order_list_main.341.34e45e5br3kwcW&gatewayAdapt=glo2fra , you have the choice beetween 2 connecttors. I use the PH2.0 Port. Carreful the wires connection are inverted. We talk later about this matter. - About the battery, you can choose this one with red JST connector, https://fr.aliexpress.com/item/1005002310168640.html?spm=a2g0o.order_list.order_list_main.300.34e45e5br3kwcW&gatewayAdapt=glo2fra - you will need a battery charger. This one is very cheap : Chargeur de batterie li-polymère Lipo v1.7.4 v 11.1v 10W 2s 3s, pièces de rechange pour modèle RC veFuchsia AEG Airsoft - AliExpress - You will need too a connector from the battery to the shield, the JST male-PH female. Carreful the wires connection are inverted on the shield. : https://fr.aliexpress.com/item/1005003727778592.html?spm=a2g0o.order_list.order_list_main.373.34e45e5br3kwcW&gatewayAdapt=glo2fra Don't hesitate to ask.
  19. oracid
    Thank you. For sitting and barking, it could be simple. For fetching a ball, it is possible with a Raspberry Pi, but not with an Arduino Nano. Although an HuskyLens cam could do the trick. For to make jumping a 2kg quadruped, Lego beams are not enough strong.
  20. oracid
    Thank you. Yes, I guess one day I will make a 12 DOF at this scale. Grey GeekServo are very good but they don't have enough torque for a 2kg weight quadruped. But may be one day I will try with something like this, https://fr.aliexpress.com/item/1005005921900128.html?spm=a2g0o.productlist.main.91.3dceXw9CXw9CCp&algo_pvid=2ba79ee1-e9b7-4e51-af5b-b249db3500d8&algo_exp_id=2ba79ee1-e9b7-4e51-af5b-b249db3500d8-45&pdp_npi=4%40dis!EUR!22.65!18.12!!!23.33!!%40211b619a16966579216562001ed684!12000034861499352!sea!FR!871422066!&curPageLogUid=TWV4F7vdT2fC
  21. oracid
    Here : TRR - Toulouse Robot Race 2023 - Oracid Races - LEGO Technic, Mindstorms, Model Team and Scale Modeling - Eurobricks Forums
  22. oracid
    Why not ? I have already use a HuskyLens camera in my quadrupeds as a head. You can see this in my YouTube channel. Thank you.
  23. oracid
    Big thank @Toastie Hi @Davidz90 , this is called parallel mechanism or 5 bars mechanism. If you go to my YouTube channel, you will find videos that explain all this. Don't hesitate to ask questions. Thank you.
  24. oracid
    Thank you !
  25. oracid
    Here is a new video with the biggest quadruped I ever made. Hope you will like it.
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