Precision Weighing With OLED Display

Precision Weighing Project with Arduino Nano and OLED Display

In this project, we design a portable, precise, and self-contained weighing system using an HX711 load cell, Arduino Nano, OLED display, DS18B20 temperature sensor, battery voltage amplifier, on/off switch, calibration, and tare buttons.

Project Features

✅ Precise Weight Measurement: High accuracy measurement with HX711 ADC module.

✅ OLED Display: Display real-time weight information and temperature values.

✅ Temperature Compensation: Ambient temperature-dependent measurement correction thanks to DS18B20 temperature sensor.

✅ Tare and Calibration Buttons: Easy to use to increase measurement accuracy.

✅ Portable & Wireless Use: Standalone operation with battery and voltage amplifier.

✅ Power Control: Energy saving thanks to on/off switch.

In this guide, I will explain step by step the circuit diagram, component connections, software codes, and how the system works. Let's get started!

I first started the project by creating a prototype with the HX711 load cell, Arduino Nano, OLED display, DS18B20 temperature sensor, calibration and tare buttons, on/off switch, and battery + voltage amplifier circuit. At the first stage, I tested the operation of the system by connecting the components together. However, the clutter of cables and external components reduced the portability and ease of use of the device.

To solve this problem, I decided to design a custom PCB that packs all the components on a single board. I drew the circuit using EasyEDA and had it fabricated on the JLCPCB. The design has been optimized to fit snugly into the 3D printed chassis, resulting in a more compact and uncluttered structure.

The result is a precision weighing system that is sleeker, more durable and easy to use. Now it's time to test all the components by soldering them to the PCB and complete the software optimizations!

We have reached the final stage of the development process! 🎯

The 3D model of the card is complete, and the top cover is cut out in such a way that the OLED display fits perfectly. The necessary holes were also drilled for the buttons and USB ports, thus ensuring ease of use and aesthetic integrity. In the final stage, we tested all the functions of the device: we checked the critical points one by one, such as the accuracy of the weight measurement, the battery status indicator, the responsiveness of the buttons and the data flow.

Thus, the project is fully ready, from design to functionality!

We have reached the final stage in this project, but the development never ends! 🚀

In the next step, we can work on a feature where we can automatically change the screen orientation by adding a gyro sensor. Thus, no matter what position the device is in, the screen will always display in the right direction. Different optimizations can also be considered to further improve the user experience.

See you in new projects! You can follow the @serialprint account for more. 👀⚡