I need help with my connections

Projects General Guidance
1

I'm building a star tracker and the hardest part turned out to be to get the motor to work (I'm a total noob in arduino). I'm using an arduino nano and a tmc2209 v3.0 driver with a nema 17 0.9 stepper motor. I've been using the code from this post TMCstepper - Arduino - TMC2209 - Projects / General Guidance - Arduino Forum but nothing seems to work. Here is my schematic:

scheme test 2
scheme test 2800×600 184 KB

Also it would be useful to mention that when I turn on the 12v power my arduino nano starts overheating where the voltage regulator is located

Thank you for your help

2

You can't drive steppers from a board, you need two power supplies, one for the NANO and one for the motors. The grounds all need to be connected though.

3

but my motor power supply (vmot and gnd) is connected to a 12v battery, not to a nano

4

OOPS, I didn't look closely enough.
In that case, try the samples from the library you are using. Make sure the wiring also follows the sample.

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5

thank you, I'll try using some other example codes

6

I'm no expert on the servo driver you are using but I noticed the TX and RX are wired to D6 and D7. They are not serial pins on the Nano.

Was the original example on a different Arduino?

7

CODE, never codes!

8

They are ok for software serial.

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9

I started researching that as I began to doubt myself. Thank you for the correction... and the information.

10

Clone Nanos and 12V are a bad combo, can you power the Nano with 5V to the 5V pin?

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11

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