the screw terminal is for an external switch to turn on/off everything, and the stepper drivers im using are the tmx2209 bigtreetech with heatsets
#esp32 controlled robotic arm
drifting ibex
im also using an esp 32 board (ESP-WROOM-32 ESP32 ESP-32S Development Board 2.4GHz Dual-Mode WiFi + Bluetooth Dual Cores Microcontroller Processor Integrated with Antenna RF AMP Filter AP STA Compatible with Arduino IDE (3PCS))
silk peak
Feel free to post questions in here!
drifting ibex
well I bascially need help for everything lmao
- I looked back at mys tepper motor and the amazon says voiltage is 12v but when i tried in 24 volts is worked even better, and so did everyone else who bought it, I read the data sheet and no where does it say a voltage regulation, just a current regulation of 2.0A so im just a bit confused on how that works and if thats true so i can safely run it at 24V.
- I need to know if my schematic is correct, any errors.
3.dont know how to really connect everything in the pcb design area, wether or not to use fill areas for the +24 volts or big traces, and same with the +5 volts - I also dont know how to properly ground eveythign, i tried putting a fill area for ground in the botom layer which worked but i see evryone putting small ground pins in their pcb and i dont have any so im confused and wonder if i need them.
Basically I need someone to walk me through all of it, it would be easier on a call tho
brazen rock
well I bascially need help for everything lmao
1. I looked back at mys tepper mo...
I can answer 1, so basically the Trinamic drivers act like constant current buck converters using the motors coil inductance, so whatever voltage you feed in will become basically nothing to keep a constant current, thats just how it works
It's not like a controlled direct pass through
So you can technically run any voltage and it direct really matter
drifting ibex
why was the torque much stronger at 24v then 12 if it doesnt matter what voltage i use?
brazen rock
But the higher the voltage the better the torque curve, so you will get more torque at lower speeds
brazen rock
Diminishing returns yes
drifting ibex
it would make me come to beleive to just feed it as much voltage for better torque
brazen rock
It really depends on the motor as well
drifting ibex
are you able to help with pcb design also?
drifting ibex
If you use 5160s you can do 48V
is that still a nema 17 or stronger model
drifting ibex
i wanna make my pcb as simple as possible so 24 volts might be good enough
i was planning on making gearboxes for more torque so im fine with that
brazen rock
Iirc the deepest nema 17s are 60mm deep, rated for 3A and have integrated thermistors
But they are expensive because they are custom
They are actually way cheaper now that they've been out a while
$50 a motor which is still insane but better that I think the 80 or so they were
drifting ibex
ideally i want as cheap as possible
for 3d printed gearboxes for higher torque would you recomend, planetary, cycloidal, or something else
brazen rock
Planetary is the simplest for torque afaik
drifting ibex
now i need help with these questions:
- I need to know if my schematic is correct, any errors.
2.dont know how to really connect everything in the pcb design area, wether or not to use fill areas for the +24 volts or big traces, and same with the +5 volts - I also dont know how to properly ground eveythign, i tried putting a fill area for ground in the botom layer which worked but i see evryone putting small ground pins in their pcb and i dont have any so im confused and wonder if i need them.
- Is the layout, design, and components im using good for working together and supplying enough current for everything given its application
brazen rock
now i need help with these questions:
1. I need to know if my schematic is corr...
What do you mean in 3 when you say "everyone putting small ground pins in their pcb"?
drifting ibex
ground vias
to go to the secound layer which is all grounded
but when i make a ground layer all the gnd pins automatically get gropunded it seems withought the vias
brazen rock
Well if they are through hole pins then yes ofc they will get grounded
But if it's smd then you will need vias
Unless you ground pour the top and first inner layers
But even then you still need vias near the pins for the smd stuff to give a short path to ground
brazen rock
Yeah