The smart coffee scale that doesn't break the bank!
https://weighmybru.com

This project is a smart coffee scale with a webserver hosted on the ESP32-S3. This scale was designed to be used in conjunction with GaggiMate, but can also be used as a standalone scale. The project is still in a beta phase and is actively being worked on. Please head over to the Discord server for more info. This scale was inspired by EspressiScale but with a non-custom PCB approach. The idea is to be low-cost, easily sourcable scale.

Documentation

The documentation, build video guide, flashing software etc. can be found on the website.

WeighMyBru Guides

Features

• Webserver via WiFi
• Bluetooth connectivity to GaggiMate
• Calibration via webserver
• Real-time flowrate display
• Adjustable decimal point readings
• Different modes for to cater for espresso and pour-overs

GaggiMate

GaggiMate now fully supports WeighMyBru scale.

GaggiMate

Installation

Installation instructions are currently under development, for now follow the link for step-by-step installation instructions. Additionally, a video is available on YouTube

  this project requires VSCode with PlatformIO extension installed

Important: Filesystem Upload Required

After uploading the firmware, you must also upload the filesystem for the web interface to work:

# Upload filesystem (required for web interface)
pio run -t uploadfs

# Or use the specific environment for your board
pio run -e esp32s3-supermini -t uploadfs  # For ESP32-S3 Supermini
pio run -e esp32s3-xiao -t uploadfs       # For XIAO ESP32S3

Without the filesystem upload:

• The device will function normally for scale operations
• The web interface will be unavailable
• You'll see a clear message explaining how to fix this issue

🌐 Web-Based Installation (Recommended)

For beginners, we now support ESP32 Web Tools for easy browser-based installation:

1. Visit weighmybru.com
2. Connect your ESP32 board via USB
3. Click "Install Firmware" and select your board:
   • ESP32-S3 Supermini
   • XIAO ESP32S3
4. Follow the prompts - no software installation required!

Benefits:

• ✅ No need to install VS Code or PlatformIO
• ✅ Automatic latest firmware version
• ✅ Complete installation (firmware + filesystem)
• ✅ Works on any modern browser (Chrome, Edge, Opera)
• ✅ Version checking and device information

For advanced users or development, continue with the PlatformIO instructions below.

Bill Of Materials (BOM)

Qty	Item	Amazon Link	Aliexpress Link
1	500g Mini Loadcell (I-shaped)	https://a.co/d/6kvxZ0H	https://www.aliexpress.us/item/3256810229632696.html
1	HX711	https://a.co/d/3KiYRkA	https://www.aliexpress.us/item/3256806665065792.html
1	ESP32-S3-Supermini Board	https://a.co/d/6289vbS	https://www.aliexpress.us/item/3256806649605779.html
2	Capacitive Touch Pads	https://a.co/d/014di6l	https://www.aliexpress.us/item/3256806118244119.html
1	0.91" SSD1306 OLED Display	https://a.co/d/9UClWku	https://www.aliexpress.us/item/3256807486098308.html
1	800mAh Li-ion Battery	https://a.co/d/gbr1Yft	https://www.aliexpress.us/item/3256809665395688.html
1	JST-PH 2.0 Male Connector	https://a.co/d/3BZGuHW	https://www.aliexpress.us/item/3256808498055527.html
1	5mm Slide Switch	https://a.co/d/9KRqMyF	https://www.aliexpress.us/item/3256808144255016.html
1	Hookup Wire (Various Colors)	https://a.co/d/1Fs8os9
2	M3x5x4 Heat Set Inserts	https://a.co/d/bnQD7Iu
16	M1.7x4 Self Tapping Screws	https://a.co/d/1np5Nes	https://www.aliexpress.us/item/2255800110173778.html
4	M3x12 Button Head Screws	https://a.co/d/iqM3d6E	https://www.aliexpress.us/item/3256807424674896.html
2	100K ohm 1% 1/4w resistors	https://a.co/d/3R0YmGM
4	Self-Adhesive Rubber Feet	https://a.co/d/0q9TRmR
1	Double Sided Tape (To hold Battery)	https://a.co/d/gM5SWwH

Printed Parts (Found in CAD Folder)

Qty	Item
1	Bottom*
1	Top
1	ESP32 Clamp
1	Screen Clamp
4	M2 Washers (Used for HX711)

* Bottom has 2 options - The supported option has engineered supports, while the standard option requires you to slice with your own supports.