Stepper control using Pot over bluetooth (HC-05)

Question

I have intermediate-level Arduino experience but it's been a few years... and, I would like to be more confident in a plan before ordering all the parts. So, basically, this is theoretical. The design cannot be simulated and I have yet to do the programming (again, still pinning down the parts/components list).

I drew up a quick wiring diagram in CirKit Designer. Can someone with experience using bluetooth modules help me determine if there are any egregious design errors and if this could potentially work to drive a Nema34 (12Nm, DMA860S driver).

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• chrisl: Looks good to me. I don't see any obvious errors. If your voltage regulator for the Arduino is able to output 5V, you could feed that directly into the 5V line (or through USB), instead of Vin like now. Vin leads to the Arduinos linear voltage regulator, which wastes the additional voltage as heat dissipation and having two voltage regulators chained like that is unnecessary. Though this question is unlikely to help someone in the future, so it probably will be closed.
• T. Paul: Thanks! I'll definitely take a look at other ways to bring in power to the Arduino. I may end up bringing 48Vdc, 110Vac, or 220Vac to the driver--depends on the driver model I end up buying. I'll figure out the most efficient way to tap supply power to the Arduino off that supply.

Answer 1

The design looks fine. However, please keep one thing in mind. HC-05 modules are available in two versions. Some run at 5V and some run at 3.3V. Please check which version you have bought. If you have the 3.3V, you need a logic-level converter between the Arduino Nano and the HC-05.

If you want to control the servo motor via Bluetooth with an Android app, you can make some modifications to your project.

https://www.pcbway.com/project/shareproject/Stepper_motor_control_x_bluetooth_and_app_9f330c90.html

• T. Paul: "Some run at 5V and some run at 3.3V"... I guess the HC-05's I ordered have an input range of 3.6-5V: amazon.com/dp/B071YJG8DR?ref=ppx_yo2ov_dt_b_fed_asin_title Thanks for that heads up. I don't need the voltage dividers for these specific modules.