Drawbot with motorshield not working

[Anonymous]

Hi,

I’ve been trying to get met drawbot running for some days now, but I just cant make it move.

Every time i try the nema17 just wiggle and stutter.

My setup is a Uno with the motorshield V1
Firmware 200 steps/rev and 16 microstepping multiplier (standard)
Software standard speed (6500)

My motors are wired red/blue and green/black, tried a lot of combinations.

Does someone have a tip to make it happen, else i will stop this project.
Making me frustrated.

Greetings,
Wiebe

Servo is doing fine,

[Dan]

enable the motors, then try settings > jog. Can you move either motor?

First I would check if your wires are backward. if two of the four wires are backward, the magnetic coils will fight each other and you won’t get stepping.

Second I would check the motors work AT ALL. Maybe a wire is broken. Less likely.

[Anonymous]

Hi Dan,

I Have already tried diffrent wire setups, now i have the wire pairs (when looped the motor has more resistance) connected to M1, and so for all motors.

I tied to test it allready with the jog function, but they just stutter.
I noticed that the driver of the shield get really really hot, myby i need to test with other motors?
Then i have to order some.

thanks

[Michael]

What is the command to enable the motors? I am in a similar situation, my servo is moving but I’m not getting movement on the stepper motors and am trying to troubleshoot. Much thanks!

[Dan]

M17 and M18 enable/disable steppers. I forget which is which.

[tjhawkey]

I ran into a similar issue recently when changing power supplies.
Different motors are optimized to run with different supply voltages.
The motors on the machine I made are 5V motors, so I need a 5V, 4A supply.
Other motors (and I think the ones Dan uses) will run at 12V and < 2A nicely.

Many modern wall plug supplies have hiccup and overcurrent shutdown.
That meant (for me) that when I tried to use a 12V, 2A supply with 5V motors, the motors would jerk a few times (hiccup mode) and then shut down as the motors wanted to draw more like 3A in operation.
Unfortunately, many motor data sheets don’t explicitly list voltage, just coil resistance, and the actual dynamics of the stepper motor are a little more complicated than V=IR, but the simple calculation should at least get you in the ballpark.

Tim

[Dan]

Putting 12v in a 5v circuit can be more than enough to cook it forever. I’ve cooked 3.3v circuits with 5v.

12v2a is 24 watts. 24 watts/5v = ~5a. AFAIK your 5v motors would have to draw 5a before the supply would shut down from overcurrent protection.

[Author]

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