Introduction

Have you wondered what is your 1RM on benchpress? What is your 1RM vs grip width? What is your max force on different distance from bar to chest? I have spent countles sleeples nights thinking about this. How hard can it be to measure the force applied to a barbell?

Project Concept

Project Requirements

The goal of this project is:
1. Measure force/wheigh applied to the barbell
2. Graph the data to a app on phone or PC
3. Perform calibration and offset calibration
4. Work from external power supply

Proof of concept build:

Needed to create a simple test setup to understand if ordered loadcell will be able to measure the needed force.

Circuit

ESP32 module and HX711 Loadcell converter

Mechanical

Connection to barbell bench to loadcell and to barlbell

App

Device in operation

Schematic Design

MCU and perephials

IMU

The sensor used is Bosch BMI323 with I2C interface

Altimeter

The sensor used is TE MS580301-BA01-00.

Pushbuttons and leds

Battery protection and charging

The IC used is TI BQ24072RGT.

PCB Layout

PCB Design:

Prototype Development

Assembly: were addressed by adding heatsinks.

Software and Firmware (if applicable)

Firmware Development:

Enclosure Design

Mechanical Design:

Final Testing and Validation

Functional Testing: .

Challenges and Lessons Learned

Challenges

Conclusion and Future Work

Summary:

Resources and References

Component Datasheets: Provide links to the datasheets of key components used in the design. Tools and Software: Mention the tools and software that were particularly helpful during the design process. Further Reading: Suggest books, articles, or videos for readers who want to learn more about the topics covered. Example: Datasheets for the TP4056 charging IC and the chosen Li-ion battery can be found here.