Upgrade your (Hornbach) Soluna 50mm wooden blinds with this simple and effective servo mount for automated tilt control. Unlike setups that require stepper motors and controllers, this design leverages a widely available mini hobby servo (SG90/MG90S) servo, making it easy to control the open and closed positions. The servo can be directly connected to the ESP and controlled with (for example) ESPHome & Home Assistant. 

Possibly works for other brands as well, as long as the frame size is 35x55mm and the shaft position matches.

Features:

• Tilt control

• Compatible with MG90S or SG90 servos 

• Integrated slot for an ESP32-C3, enabling wireless automation.

• No stepper motor, no stepper controller—just a simple, effective servo solution.

• Quick installation: No drilling or permanent modifications required. Simply remove the snap-fit pan/tilt mechanism.

• Compact and discreet design, ensuring a clean look.

• Precise control using the servo’s internal potentiometer—set open/closed positions with ease.

Limitations:

• 180-degree rotation limits tilt range a little. However, it is sufficient to open and close the blinds, which was enough for my needs. 

  • I have made a version with transmission (gears) to increase tilt range - however the negative effect on torque did not result in a usable version yet

  • Potentially the servo can be modified to allow continuous rotation, however you would loose the precise position control

Print Recommendations:

• Material: PETG or ABS for durability and UV/heat resistance.

• Layer Height: 0.2mm for precision.

• Infill: 20% or higher for strength.

• Supports: May be needed for overhangs.

 

ESPHome code

globals:
  - id: shade_1_position
    type: float
    restore_value: true
    initial_value: '0.5'  # Midpoint
Output configuration for servo
output:

platform: ledc
id: pwm_output
pin: GPIO3
frequency: 50 Hz

Servo configuration
servo:

id: my_servo
output: pwm_output
min_level: 2.5% #2.5%
max_level: 12.5% #12.5%
auto_detach_time: 2s  # Reduces power draw after movement
transition_length: 2s

Sliders for controlling the servos in the web UI
number:

platform: template
name: "Servo 1 Position"
id: servo_position_1
min_value: -100
max_value: 100
step: 10
optimistic: true
mode: slider
restore_value: true
set_action:
  then:
- lambda: |-
    auto level = x / 100.0;
    id(my_servo).write(level);
    id(shade_1_position) = (level + 1.0) / 2.0;  // Convert -1.0–1.0 to 0.0–1.0

cover:

platform: template
name: "Shade"
id: shade_1
open_action:

number.set:
  id: servo_position_1
  value: 100
close_action:
number.set:
  id: servo_position_1
  value: -100
stop_action:
number.set:
  id: servo_position_1
  value: 0
position_action:
lambda: |-
  auto value = (pos - 0.5) * 200.0;  // Map cover position (0.0-1.0) to servo position (-100 to 100)
  id(servo_position_1).publish_state(value);  // This triggers the actual servo move
  ESP_LOGE("shade_1", "Servo position set via position_action: %.2f", value);
lambda: |-
  id(shade_1_position) = pos;  // Track actual cover position (0.0–1.0)
  ESP_LOGE("shade_1", "Cover position set via position_action: %.2f", pos);
number.set:  # This explicitly updates the servo position when cover position changes in Home Assistant
  id: servo_position_1
  value: !lambda "return (pos - 0.5) * 200.0;"  # Lambda to calculate the value as a float
optimistic: true
assumed_state: true
has_position: true