Massage Gun

Overview:

This project uses an ESP32 Microcontroller to control the 

vibrational speed of a brushed motor. It supports a SSD1306 OLED 

screen to display the one of the 3 set speeds, and a button to change 

between said speeds.

Features:

• ESP32-S3-WROOM-1 microcontroller

• USB-C Power Delivery controlled by microcontroller (5V)

• Decoupling capacitors for high voltage, overcurrent, and reverse polarity protection

• I2C protocol for an SSD1306 OLED screen support

• A push switch/button to regulate motor speed

• Motor Driver to translate the PWM given by the ESP32

3D View

Assembled PCB

• Project Flow:

  • Send 5V through USB-C, which is dropped to 3.3V in LDO

  • LDO connects to ESP32, which sends PWM into motor driver

  • Driver is connected to the brushed motor, with 5V powering it

  • Adjust speeds with a switch, sending speed data onto the display (Programmed via ESP32)

Key Takeaways + What We Learned:

• Need to keep thermals in mind when routing the PCB

• Use surface-mount passives instead of through-hole to save space

• Improve proximity of buttons to other parts (accidentally melted some buttons while soldering nearby parts)

• Label everything to keep everything organized

• Ensure part compatibility