2 layers15.3 × 19.3 mm
Kicad hx711 tyny85
IvDm/Z-probe-on-smd-resistors-2512
Auto bed level strain gage for 3D printer using resistors 2512 instead of strain gauges.
18 parts150GPL-3.0
2 layers50 × 40 mm
Yieldguard
msafeerhassan/yieldguardAn ESP32 Based Project for automatically logging Milk Weight to prevent fraud - For Real World Use.
- Size
- 50 × 40 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 4
- Nets
- 22
- Pads
- 32
- Tracks, vias
- 49, 0
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 24 May 2026
- Updated
- 15 Oct 2026
Overview
Yieldguard is an open-source printed circuit board by msafeerhassan, from the msafeerhassan/yieldguard repository on GitHub. It is a 2-layer board of 50 × 40 mm with 4 parts on 22 nets, routed with 49 tracks and 0 vias.
It is built around the HX711. Its parts include 2 ICs and 1 connector. It belongs with the ESP32 and RISC-V boards of this library.
Main components
1README
README.mdYieldGuard
An automatic Milk Weight Logging System using ESP32, HX711 and Load Cell
How it works:
- The whole hardware sits under the milk collection Jar.
- The milk gets collected inside the Jar - Hardware silently notices it.
- When the milking completes, the weight becomes stable.
- Once it stabilizes for more than 3 minutes, the milk weight gets logged and is sent over WhatsApp as a message.
- It repeats :)
How to use it?
- Go over to JLCPCB.
- Download the Gerber Files from this repository and upload them there and order PCB.
- Use the links in BoM (Bill of Materials) to order other components (The 3D Case can either be 3D-Printed or pre-made case can be ordered).
- Solder all the components on PCB and wire them properly as per the Schematic Diagram.
- Connect ESP32 with your device and boot the Calibration Code in it.
- Follow all the instructions mentioned in Serial Monitor to calibrate the Load Cell Specs etc.
- Boot ESP32 with the main code given in Firmware/Main/main.ino file.
- That's all :) Enjoy.
Why I built this?
I built this project to solve the real problem we faced at our farm - manual milk logging was quite difficult and unreliable. This automatic milk logging system makes the system highly reliable and efficient.
Screenshots:
Bill of Materials
| Item Name | Quantity | Link | Cost |
|---|---|---|---|
| ESP32-C3-SuperMini | 1 | https://epro.pk/product/esp32-c3-wireless-development-board-wifi-bluetooth/ | $2.53 |
| CZL-601 Aluminum Alloy 100kg Load Cell | 1 | https://www.aliexpress.com/item/1005007658937664.html | $13.00 |
| HX711 Module | 1 | https://epro.pk/product/arduino-load-cell-amplifier-hx711-hx-711-digital-scale/ | $0.60 |
| 3D Case | 1 | https://epro.pk/product/waterproof-electronic-enclosure-box-150x110x75mm-4x6x3-inch-in-pakistan/ - Can be 3D Printed also | $1.00 |
| PCB | 5 | JLCPCB | $16 |
| AliExpress Taxes | - | - | $7.80 |
| ePro.Pk Shipping Charges | - | - | $1 |
| TOTAL COST | - | - | $42 |
Parts
4| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | Conn_01x04_Socket | TerminalBlock_Phoenix:TerminalBlock_Phoenix_MKDS-1,5-4-5.08_1x04_P5.08mm_Horizontal | J1 |
| 1 | ESP32_C3_Super_Mini | KiCad:ESP32-C3_SuperMini | U1 |
| 1 | HX711 | KiCad:HX711_module | U2 |
| 1 | LOGO | KiCad:LOGO | G*** |
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Questions
How big is the Yieldguard PCB?
It measures 50 × 40 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Yieldguard use?
4 parts, built around the HX711. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Yieldguard KiCad files?
From the msafeerhassan/yieldguard repository on GitHub, at the commit this page was made from: the board is KiCad/YieldGuard.kicad_pcb and its schematic KiCad/YieldGuard.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Yieldguard design in my own project?
Its repository states no licence, so its author keeps all rights: ask msafeerhassan before reusing the design.