Roller blind ESP8266 28BYJ-48 stepper motor and ULN2003 driver

ESPHome
,
1

Hi all,

I’ve been struggling with this a bunch and I cant seem to get any further, hence my first post on this forum:

I’m trying to build motorised smart blinds. At first I followed Everythingsmarthome’s tutorial to a T. I fried my first buck converter due to a mistake in his schematic but figured it should work after adjusting for that error. I replaced everything just in case I damaged any other components, but no matter what I did I couldn’t get it to work. The logs show Homeassistant sending the commands and them being picked up by my D1 mini but I couldn’t get any sign of life from the stepper.

After weeks of fidgeting I figured I’d try the ULN2003 driver the stepper gets shipped with. Eureka I thought: when I click the button on Homeassistant my stepper turns. My joy was short lived however, as I quickly realised it will only turn clockwise, regardless of whether I press the up or down button.

I’ve tried every possible wiring combination on the INT pins but the motor either spins clockwise or not at all.

Here’s my wiring (I’m feeding the 5v stepper with a 12v adapter, is that an issue?):

IMG_9590
IMG_95901920×2560 327 KB

and my code:

esphome:
  name: my_blind
  friendly_name: scherm

esp8266:
  board: d1_mini
  
# Enable logging
logger:

# Enable Home Assistant API
api:
  services:
    - service: control_blind
      variables:
        target: int
      then:
        - stepper.set_target:
            id: my_stepper
            target: !lambda 'return target;'
        - sensor.template.publish:
            id: position
            state: !lambda 'return target;'
  encryption:
    key: "MXxubr6AnYyclqvxIaCh/Ilw1Wu7mN3ViMktsVqUFxo="

ota:
  password: "95c5b06184b0236dc75bbf850855a05e"

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

  # Enable fallback hotspot (captive portal) in case wifi connection fails
  ap:
    ssid: "Scherm Fallback Hotspot"
    password: "fkI3VDZXGkWm"

cover:
  - platform: template
    name: "My Blind"
    id: my_blind
    device_class: blind
    open_action:
      - stepper.set_target:
          id: my_stepper
          target: 1000
      - sensor.template.publish:
          id: position
          state: !lambda return id(my_stepper).target_position;
    close_action:
      - stepper.set_target:
          id: my_stepper
          target: -1000
      - sensor.template.publish:
            id: position
            state: !lambda return id(my_stepper).target_position;
    stop_action:
      - stepper.set_target:
          id: my_stepper
          target: !lambda return id(my_stepper).current_position;
      - sensor.template.publish:
            id: position
            state: !lambda return id(my_stepper).current_position;
    optimistic: true
    assumed_state: true

sensor:
  - platform: template
    name: "My Blind Position"
    id: position

stepper:
  - platform: uln2003
    id: my_stepper
    sleep_when_done: true
    pin_a: D4
    pin_b: D3
    pin_c: D2
    pin_d: D1
    max_speed: 250 steps/s
2

Sounds wiring problem but you never know…
What motor you have?

try this wiring:

    pin_a: D3 #IN4 - green
    pin_b: D4 #IN3 - blue
    pin_c: D2 #IN2 - yellow
    pin_d: D1 #IN1 - orange
    max_speed: 100 steps/s