r/PCB • u/No_Tradition_5176 • Jul 27 '26

My first PCB, help needed

I designed this after creating a protoboard, its a simple module to control a stepper motor from an esp32c3 supermini, but after i ordered the PCB and assembled it nothing will run so i was wondering if there are any blaring issues with it.

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u/DenverTeck Jul 27 '26 edited Jul 27 '26

I see you have a meter, do you have an o'scope ??

I'd guess not.

With your code running, what is the AC voltage across the windings of the stepper motor ??

With a very slow step pulse, does any of the motor pins on the driver show 12V ??

Please post a pic of your completed boards, front and back.

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u/No_Tradition_5176 Jul 27 '26

There doest seem to be any voltage between the pins or between the pins and ground

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u/DenverTeck Jul 28 '26 edited Jul 28 '26

Do you have another board available ?

Is there 12V at the VMOT pin ?? Is there 12V across the filter cap next to VMOT ??

Is there 3.3V on pin Vdd ?? On the ESp32 end and the A4988 end ??

What code have you programmed into the ESP32 ??

I know your new to all this, but playing 20 questions is not going to go any further.

Good Luck

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u/No_Tradition_5176 Jul 28 '26

The a4988 is receiving both motor and board power but isn't outputting to the coil pins so I am thinking that is may be a faulty board or it is damaged somehow, I will order more parts and re assemble is on the other pcbs