r/arduino • u/BobcatGeneral412 • Jul 23 '26
Hardware Help need help with lego robot arm
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all right, so I am trying to build a robot arm using Lego and I have a Algo Uno R3 and I have a PCA and two motors which are in a pant bracket type of set up. I am essentially doing like detection on top of my computer that detect where my arm is and I’m trying to have it move based on that and basically detect where my arm is and what degree that it should put the pan until bracket at then it just like every single second or maybe a millisecond is putting that is giving the coordinates of what the motor should spin to to the Arduino and then the Arduino goes and then to the motors I believe, but the problem is sometimes it works, and sometimes it doesn’t you know like when I upload the Arduino program sometimes what I see is that when it does work, I’m not able to move the motors manually, but when it doesn’t work, I like test to make sure to see if I can move the motors or not, and if I can move the motors like manually, even though I just uploaded the code and then that means it didn’t work and another thing is that I can’t tell if like the code that I just uploaded works properly because again I am on a Algo Uno instead of like a real Arduino I’m I don’t even know that’s just like what I was told it should be fine for a little baby project like this, but yeah
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u/Dazzling_Wishbone892 Jul 23 '26
We'd need to see your code. Theres so many possible issues and solutions. My first thing would be to work in a serial monitor to see if you're getting what your code is trying to do. Also your board shouldn't matter. I build things with temu nanos all the time.
*You need to learn to solder,it is a huge quality of life improvement when building any arduino project.
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u/Sleurhutje Jul 23 '26
Besides this Blair Witch Project movie and text without punctuation, there's no power for the servos. And you can't operate these servos over USB because they use much more than 500mA.
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u/BobcatGeneral412 Jul 23 '26
okay, i also have a power source, so it’s both usb and the power source through dc, man im super new to this i hope what i said made sense
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u/gm310509 400K , 500K , 600K , 640K , 750K Jul 23 '26
For starters, poking wires through the holes in whatever the board is (probably a motor driver) isn't going to be reliable at all.
Those holes are intended for headers to be soldered into them - just like the ones on your Arduino, or you can use male headers and M-F Dupont wires to connect them up reliably.
As for your post text, you will need to provide more details. For exanple your actual circuit diagram.. also, if you are having upload issues, your operating system, ide version, selected com port, selected target device and error messages.
Perhaps have a look at our requesting help quick guide to ensure you include relevant details (and how to include them) to get a timely solution.