Stepper Motor, ESPHome

Dizzwold · December 15, 2024, 4:54pm

Hi Guys,

I’m trying to implement a stepper motor in esphome but something must have changed recently regarding inverting a pin.
If I try to upload the sketch, it fails. I check the What Went Wrong, and it keeps telling me the following;
mapping values are not allowed here in "/config/esphome/curtain-steppertest-1.yaml", line 61, column 14
Line 61 is the following;
inverted: True

I can’t understand why this isn’t accepted. Heres the full sketch;

esphome:
  name: curtain-stepper-test-1
  friendly_name: Curtain Stepper Test 1

esp32:
  board: esp32dev
  framework:
    type: arduino

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: "xxxxxx"

  #services: 
   # - service: shaft_target

ota:
  - platform: esphome
    password: "xxxxxx"

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Curtain-Stepper-test-1"
    password: "xxxxxx"

    services:
      - service: position
        variables:
          target: int
        then:
          - stepper.set_target:
            id: st1
            target: !lambda "return target"
captive_portal:

number:
  - platform: template
    name: Stepper Control
    optimistic: True
    min_value: 0
    max_value: 2000
    step: 1
    on_value: 
      then:
        - stepper.set_target:
            id: st1
            target: !lambda 'return x;'

stepper:
  - platform: a4988
    id: st1
    dir_pin: 17
     inverted: True
    step_pin: 21

    max_speed: 1000 steps/s

    sleep_pin: 22
     inverted: True
    acceleration: 800
    deceleration: 800

WallyR · December 15, 2024, 9:08pm

I had a similar experience with a serial setup.
It worked with both pins inverted and both pins not inverted.
But not with just one pin inverted.

Rudd-O · December 15, 2024, 10:43pm

That is highly illegal YAML. Look at the docs again for proper form.

Dizzwold · December 16, 2024, 2:50pm

Hi Guys,

Thank you for your replies. Im very grateful.

I’ve edited the sketch, and it will now compile and upload, but I get nothing from the motor if I move the slider.
I wondering if it’s my wiring setup or setting on the driver I have?
Heres the current sketch;

  name: curtain-stepper-test-1
  friendly_name: Curtain Stepper Test 1

esp32:
  board: esp32dev
  framework:
    type: arduino

# Enable logging
logger:

# Enable Home Assistant API
api:
  encryption:
    key: "xxxxx"

ota:
  - platform: esphome
    password: "xxxxx"

wifi:
  ssid: !secret wifi_ssid
  password: !secret wifi_password

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Curtain-Stepper-test-1"
    password: "xxxxx"

   
captive_portal:

number:
  - platform: template
    name: Stepper Control
    optimistic: True
    mode: SLIDER
    min_value: 0
    max_value: 100
    step: 1
    on_value: 
      then:
        - stepper.set_target:
            id: st1
            target: !lambda 'return x;'

stepper:
  - platform: a4988
    id: st1
    dir_pin:
      number: GPIO17
      inverted: True
    step_pin: GPIO21

    max_speed: 250 steps/s

    sleep_pin:
      number: GPIO22
      inverted: True
    acceleration: 800
    deceleration: 800

This is the driver I have and the Nema 23 motor.

https://www.aliexpress.com/item/1005004822801078.html?spm=a2g0o.order_list.order_list_main.35.b9b61802Uy8FXE

https://www.omc-stepperonline.com/nema-23-stepper-motor-2-4nm-339-79oz-in-4a-57x57x82mm-8mm-shaft-4-wires-23hs32-4004s

I have a 24v 600w PSU connected to the driver COM and VM (- & +).
The ESP32 to Driver have the following connections;
GPIO 17 to Dir + on the driver
GPIO 21 to Stp + on the driver
GPIO 22 to En + on the driver
I also have a Gnd wire from the ESP to the Negative on the PSU (same terminal as the COM on Driver).

Should my sketch theoretically work, or is it my wiring?

3ATIVE · December 16, 2024, 4:18pm

Check the datasheet for that interface board… you may not need to invert the “Sleep Pin”

Karosm · December 16, 2024, 4:23pm

You also need to connect all three - to GND

3ATIVE · December 16, 2024, 4:38pm

… A quick Google-ing later:
Indeed the Enable Pin on your board is “Active High” - So you should not need to invert it

Dizzwold · December 17, 2024, 7:36am

@3ATIVE @Karosm @Rudd-O @WallyR

Thank you guys for your replies. I’m most grateful.

I’m waiting for the retailer to reply with the data sheet.

So Dir -(negative), Stp- (negative), and En - (negative), all need connecting to ESP32 - Gnd.

Dizzwold · December 17, 2024, 7:38am

@3ATIVE just spotted your googled reply, Ill give that a go.

Dizzwold · December 17, 2024, 7:49am

@3ATIVE before you loose the google info, where exactly did you find that information?

I’ve found very little information on this driver board, I’ve even got the seller trying to tell that it can use Stallguard which I think is a load of dogs gonads to be honest.

Karosm · December 17, 2024, 10:39am

Which should be common ground with driver board.
Alternatively you can connect +pins to 3.3V and -pins to Esp gpio pins.

Dizzwold · December 17, 2024, 11:24am

@Karosm @3ATIVE

Solved By @Karosm & @3ATIVE in the posts above.

Thank You Guys.

I’m now up and running, or should I say rotating.

You were both correct with your replies.
As I can’t select both your posts as solutions, Ill click it on this post.

I needed En to be High and not Low, and i needed a Gnd from the ESP to Dri-, Stp- and En- (- Negative).

I can now tinker away and start experimenting.

Thank you again.

Dizzwold.