Issues increasing TMC2209 speed

Projects General Guidance
1

Hello! Im working on a project where ive wired 3 buttons to control the speed of a NEMA17 stepper motor. Think Low, Mid and High speed. I have the code written below and it all works but for some reason when i try to increase the Hz over 100, the speed doesnt seem to change and i cant figure out why.

I'm using an arduino nano and a TMC2209 stepper driver and am feeding it 24V. I've also left all the MSI pins unplugged. I'd be so grateful if anyone can shed some light on why i cant increase the speed, thanks so much in advance! I've put the code below.

#include <AccelStepper.h>

#define dir 2
#define stp 3

#define btnLow 6
#define btnMid 7
#define btnHigh 8

const int stepsPerRev = 200;
#define MotorInterfaceType 1
AccelStepper stepper(MotorInterfaceType, stp, dir);

unsigned long runStartTime = 0;
bool running = false;
bool stopping = false;
long initialPosition = 0;

void setup() {
  Serial.begin(9600);
  pinMode(btnLow, INPUT_PULLUP);
  pinMode(btnMid, INPUT_PULLUP);
  pinMode(btnHigh, INPUT_PULLUP);

  stepper.setAcceleration(2000);  // smoother ramp-up/down
  Serial.println("Stepper Smooth Stop After 10 Seconds");
}

void loop() {
  unsigned long now = millis();

  // LOW speed
  if (!running && digitalRead(btnLow) == LOW) {
    stepper.setMaxSpeed(stepsPerRev * 20);  // 4000 steps/sec
    long stepsToMove = stepper.maxSpeed() * 10;
    stepper.moveTo(stepper.currentPosition() + stepsToMove);
    initialPosition = stepper.currentPosition();
    runStartTime = now;
    running = true;
    stopping = false;
    Serial.println("Running at LOW speed (20 Hz) for 10s");
    delay(200);
  }

  // MID speed
  if (!running && digitalRead(btnMid) == LOW) {
    stepper.setMaxSpeed(stepsPerRev * 100);  // 10,000 steps/sec
    long stepsToMove = stepper.maxSpeed() * 10;
    stepper.moveTo(stepper.currentPosition() + stepsToMove);
    initialPosition = stepper.currentPosition();
    runStartTime = now;
    running = true;
    stopping = false;
    Serial.println("Running at MID speed (50 Hz) for 10s");
    delay(200);
  }

  // HIGH speed
  if (!running && digitalRead(btnHigh) == LOW) {
    stepper.setMaxSpeed(stepsPerRev * 110);  // 20,000 steps/sec
    long stepsToMove = stepper.maxSpeed() * 10;
    stepper.moveTo(stepper.currentPosition() + stepsToMove);
    initialPosition = stepper.currentPosition();
    runStartTime = now;
    running = true;
    stopping = false;
    Serial.println("Running at HIGH speed (100 Hz) for 10s");
    delay(200);
  }

  // Initiate deceleration at ~9500ms
  if (running && !stopping && (now - runStartTime >= 9500)) {
    stepper.stop();  // smooth deceleration
    stopping = true;
    Serial.println("Initiating smooth stop...");
  }

  // Once stopped, clean up
  if (running && stopping && !stepper.isRunning()) {
    running = false;
    long stepsMoved = stepper.currentPosition() - initialPosition;
    Serial.print("Motor smoothly stopped after ~10s. Steps moved: ");
    Serial.println(stepsMoved);
  }

  // Run stepper
  if (running) {
    stepper.run();
  }
}
2

Read the pinned post re 'How to get the most out of the forum'

3

I think I see your problem, you mixed up the wire colors. Maybe the blue one and the orange one are reversed! The same colors you used wiring the buttons is confusing.

Request for Detailed Information:

I’m not sure I can help without seeing exactly what you have in front of you. To assist you effectively, please provide the following:

  1. Annotated Schematic: Post a detailed schematic of your setup exactly as you have it wired, showing all connections, including power, ground, and power supplies.
  2. Technical Information Links: For all hardware devices in your circuit, provide links to technical information. Be aware that many items in the Arduino/Pi world may have the same name but function differently. Links to sales pages like Amazon often lack the necessary technical details, so ensure the links you provide contain the correct specifications and data sheets.
  3. Be Thorough: It’s your problem, and the more precise and detailed information you provide, the faster we can help you troubleshoot. This saves everyone time and helps us give you the best possible assistance.
4

Are we talking about a classic nano? (Unfortunately there are a lot of very different 'nano' nowadays)
With a classic nano Accelstepper can create about 5000 steps/sec at max. So your 10,000 and 20,000 steps/sec ist far beyond that limit. That has nothing to do with the TMC2209.