pico tmc2209

By tlfong01 on December 27, 2021 • ( Leave a comment )

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I am new to using stepper motors and micropython. I am having trouble getting my stepper motor to turn. I am using a raspberry pi pico and a tmc 2208 driver to control my stepper motor. I can hear the coils being powered on and off, but I get no motion.

Here is a a wiring diagram

Here is my script

from machine import Pin
import utime

direction = Pin(14, Pin.OUT)
step = Pin(15, Pin.OUT)
enable = Pin(13, Pin.OUT)

enable.low()

direction.high()

def stepOne():
  step.high()
  utime.sleep(0.001)
  step.low()


while True:
    stepOne()
    utime.sleep(0.1)

pi-pico Share EditFollowClose 1Flagasked 11 hours ago Tristan Verduzco1111 bronze badge New contributor

2how much time is utime.sleep(0.001)? – jsotola 11 hours ago
1Nice picture but it does not help me much. A schematic showing all connections including power, power source, etc would help a lot. Post a link to the hardware items that has technical information. I will guess and it sounds like you are short on power, voltage and or current. This can be confirmed with more information. – Gil 10 hours ago
(1) First thing first, the TMC2208datasheet: trinamic.com/fileadmin/assets/Products/ICs_Documents/… – tlfong01 7 hours ago
(2) Next, a quick and dirty summary: 2-phase stepper, 32 uSteps, 36VDC, internal current sensing, hard/soft(uart) config, … – tlfong01 7 hours ago
(3) Get a couple of assembled modules: pt.aliexpress.com/item/… – tlfong01 7 hours ago

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1 Answer

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(1) First thing first, the TMC2208datasheet: trinamic.com/fileadmin/assets/Products/ICs_Documents/… – tlfong01

(2) Next, a quick and dirty summary: 2-phase stepper, 32 uSteps, 36VDC, internal current sensing, hard/soft(uart) config, … –

(3) Get a couple of assembled modules: pt.aliexpress.com/item/… –

(4) I am too lazy to upload pics in Imrur and link them here. So I cheat by using my answer space.

(5) Skim the module user guide.

(6) Show the Pico + TMC2208 Wiring/Schematic.

(7) Compare and contrast the wiring with a similar and already debugged project, say the very popular A4899, to make sure no important wiring is missing.

A4899 Microstepping Motor Driver Troubleshooting – EESE Q&A 2021apr14

(8) Manual testing, using (a) Manaul jumper wiring, (b) manual configurable PWM sig gen.

A4899 Stepping Motor Driver Test