Posts: 1
Joined: Thu May 16, 2019 1:15 pm

Powering Raspberry Pi Zero W and 3 steppers motors

Thu May 16, 2019 4:22 pm

Hello all,

I am trying to create a prototype for a project of mine which uses Raspberry Pi Zero W and a bunch of external modules.

Basically, I want to control 3 Nema17 stepper motors and a 12v solenoid for a tactile machine. For stepper drivers, I'll use 3 A4988. Since I want to create an enclosure for the Raspberry, control it via WiFi and the put all the components on a PCB I want to power everything using a single source.
I can run the stepper motors individually and power them using a 12v power source but I am a bit confused about powering the Raspberry board without using a micro USB.
I am planning using a power supply with a 5.5 jack like this one https://www.amazon.com/Adapter-100-240V ... B019Q3U72M.

I found a similar project in https://hackaday.io/project/86834-raspb ... thololgy-1 which uses a tiny LM2576 module like this one https://www.ebay.com/itm/LM2576HV-LM257 ... 0976351390 . The step-down module can power the board with 5V, I am just not quite sure if the approach is correct.

Has anyone designed a similar project? Any recommendations, assistance or tips will be highly appreciated.

Posts: 45
Joined: Mon Mar 19, 2018 1:18 pm

Re: Powering Raspberry Pi Zero W and 3 steppers motors

Thu May 16, 2019 8:15 pm

A car usb charger will use a tiny fraction of the 12V source (needed for steppers) to power the Zero too.

And yes, the LM2576 is ok too

Posts: 5650
Joined: Fri May 31, 2013 9:28 pm
Location: Mansfield UK

Re: Powering Raspberry Pi Zero W and 3 steppers motors

Thu May 16, 2019 8:48 pm


One word of warning.

When using a DC-DC buck converter ( LM2576 ) with variable output to power you pi you must make sure you set the output voltage to 5.1V before you connect it to your pi, as these devices are not factory set to any particular voltage.

I have used similar DC-DC buck converters to the one you found on eBay without a problem, even when powering a pi2B so you should have no problem powering a pi zero from one
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