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TMC2209 + CNC-shield + P2 : A nice Combination to Control Step Motors — Parallax Forums

TMC2209 + CNC-shield + P2 : A nice Combination to Control Step Motors

Christof Eb.Christof Eb. Posts: 1,214
edited 2024-10-22 07:24 in General Discussion

Hi,
just thought I could share a way to control step motors with P2, that I find "quiet" convincing. As there is not much clear information, whether the combination works, this post might be helpful.

TMC2209 V1.3 is a little module using the Trinamic step motor driver TMC2209. I bought mine from BIGTREETECH/Amazon. This chip has advantages over A4988 modules:

  • lower RDS.on, so it will generate less heat
  • higher resolution of microsteps
  • interpolation of 256 microsteps. This feature makes the combination to run with significantly less noise.
    It has also a nice feature to reduce current in standstill. Other features, like detection of stalling I have not yet tested.
    There is information for the similar version 1.2: https://github.com/bigtreetech/BIGTREETECH-TMC2209-V1.2

One reason to make this post, was that when I hooked up the combination, I for some time tried to find a bug in my setup and I could not find it. - Until I realised, that the stepper did actually move, but so quietly, that I just didn't notice....

CNC-shield V3.00 is made for arduino boards. And you will find a lot of information to combine it with 5V control voltage and A4988 or DRV8825 driver modules. It also does work with 3V3. It has a nice additional header to connect to a different controller than arduino.

All MS jumpers left open means all are LOW, which means 8 microsteps. I also tested 32 microsteps.

As on the shield for A4988 "Reset" is connected to "Sleep", we cut off the "CLK"="Sleep" pin at the V2209 module, which has a pulldown resistor. We also cut the pins at the small side, because they might connect to the capacitor leads.

To get moving at one axis connect DC power < 28V -I initially use 12V- and between P2 and the shield:

  • 3V3 logic voltage from P2 to "5V" of the shield.
  • GND
  • EN at the shield to a port of P2. LOW will enable all the drivers of the shield. HIGH will switch off the motor currents.
  • Dir to a port pin to set the direction
  • Step to a port pin for a pulse for every microstep

Also you might want to set the drive current, see manual for V1.2. With R.sense=0,11 Ohms the complicated formula becomes I.rms= 0.707*V.ref

Reduction of current in standstill is already active by default.

This simple type of connection does not use the serial interface of the driver module.

Have fun!
Christof

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