🍼 Smart Baby Bottle Scale

Measure every feeding automatically — ESP32 + ESPHome + Home Assistant + BabyBuddy

Fully 3D‑printed • Open‑source • Wifi‑connected • Accurate to the gram

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🎯 Overview

This project is a smart baby bottle scale built with:

• an ESP32‑S3,
• an HX711 load cell amplifier,
• a load cell,
• an OLED display,
• RGB LEDs,
• and ESPHome.

It automatically measures how much your baby drinks and sends the result directly to Home Assistant, which then creates a feeding entry in BabyBuddy.

Everything is fully autonomous, compact, and 3D‑printed.

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🧩 Features

• Accurate milk consumption tracking (using calibrated load cell + HX711)
• Automatic BabyBuddy feeding logs through Home Assistant
• 3D‑printed enclosure (Bambu Studio .3mf included)
• OLED screen showing:
  • Bottle weight
  • Consumption
  • Last feeding time
  • Time since last feeding
• RGB LED feedback
  • White fade in → bottle placed
  • Yellow fade out → feeding started
  • Green fade out → feeding finished
  • Red pulse → error or invalid state
• Two physical buttons
  • FULL → marks the bottle before feeding When pressed a circle is drawn on the top right corner of the screen
  • EMPTY → marks the bottle after feeding
  • When pressed the circle on the top right corner of the screen disappears
• Static IP + fallback Wi‑Fi AP
• State restored after reboot (timestamps, full weight, etc.)

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🛒 Bill of Materials (BOM)

Electronics

Item	Description	Link
Load Cell + HX711 Kit	50kg scale sensor with amplifier	https://fr.aliexpress.com/item/1005006165499175.html
ESP32‑S3 DevKitC‑1	Main controller running ESPHome	-
SSD1306 OLED (128×64)	I²C display	https://fr.aliexpress.com/item/1005006262908701.html
WS2812 RGB LED strip	3 LEDs	—
2× Momentary push buttons	FULL + EMPTY	—
8× M3 screws	—

3D‑Printed Parts

• Complete .3mf Bambu Studio project included
• https://makerworld.com/en/models/2016578-babybuddy-scale#profileId-2172857
• Supports:
  • Load cell mount
  • Front panel for OLED + buttons
  • Compartment for ESP32 + HX711

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📸 Photos

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📡 How It Works

1. Press FULL before feeding

• Weight is stored as “full bottle”
• Timestamp saved
• Yellow LED effect
• Display shows full bottle icon

2. Press EMPTY after feeding

• New weight measured
• Consumption is calculated
• Data is sent to Home Assistant
• Green LED effect

3. Home Assistant Automation

Home Assistant receives the values and automatically calls the BabyBuddy API to create a feeding entry (Formula / Bottle).

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📦 ESPHome YAML Configuration

Full ESPHome config used in this project is available here:

/esphome/biberon.yaml

It includes:

• I²C OLED setup
• HX711 calibration table
• RGB LED effects
• State persistence
• Two GPIO buttons (full/empty)
• Consumption calculation logic
• Timestamp handling via Home Assistant time source

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🏠 Home Assistant Automation

Place this YAML inside your HA automations and edit accordingly the device_id:

alias: Baby feeding bottle
description: ""
triggers:
  - trigger: state
    entity_id: sensor.biberon_bottle_consumption

conditions:
  - condition: template
    value_template: >
      {{ states('sensor.biberon_bottle_full_button_last_press') not in
         ['unknown','unavailable',''] and
         states('sensor.biberon_bottle_empty_button_last_press') not in
         ['unknown','unavailable',''] }}

  - condition: template
    value_template: >
      {{ states('sensor.biberon_bottle_consumption') | int(0) > 0 }}

actions:
  - delay: "00:00:02"
  - action: babybuddy.add_feeding
    target:
      device_id: 51762e63db1082c325ccfa7d02a4f4d6
    data:
      type: Formula
      method: Bottle
      start: "{{ states('sensor.biberon_bottle_full_button_last_press') }}"
      end: "{{ states('sensor.biberon_bottle_empty_button_last_press') }}"
      amount: "{{ states('sensor.biberon_bottle_consumption') | int(0) }}"

mode: queued

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🧪 Calibration

Load cell calibration is performed using ESPHome’s calibrate_linear filter.
You can recalibrate using known weights, then update the YAML accordingly.

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📁 Project Structure

enclosure.3mf
biberon.yaml
README.md
LICENSE

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❤️ Why I built this

Feeding logs are incredibly useful for newborns, but typing them manually is tedious.
This project removes all friction by logging feedings automatically and accurately.

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🙌 Contributions Welcome

Feel free to open issues or PRs if you'd like to improve the design, YAML, or integration.

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