Hello Lemmings, Hope you guys are doing well.

Objective: Open the door automatically through HomeAssistant

My Plan:

  1. Use an ESP32 and flash ESPhome. Wire up Servo Motor (SG90) with ESP32. Tie a thread on between the Servo Motor Arm and the physical latch (physical latch that I can pull to unlock the door) such that when the servo motor turns from -100 to +100, the latch is being pulled to cause the door to be unlocked.

  2. I am planning to power this using AA Cells + DC DC Boost convertor.

Issue:

  1. How do I mount the Servo Motor on the door?
  2. Is there any other (read better) way to achieve the same result?
  3. Would you recommend any power source other than AA Cells?

Image for reference:

The latch has a keychain-like loop where the thread is tied. To unlock the door manually, I pull the latch towards right (---->) . This action is planned to be automated by Servo Motor.