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DIY Smartwatch with multiple Watch Faces, Heart Rate Sensor, Compass and Games

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DIY Smartwatch with multiple Watch Faces, Heart Rate Sensor, Compass and Games

Advanced

ESP32

₹1,500 – ₹5,000

6 – 12 Hours

Partial Kit

DIY Smartwatch with multiple Watch Faces, Heart Rate Sensor, Compass and Games

Build a fully functional DIY smartwatch from scratch using an ESP32, complete with custom watch faces, a heart rate sensor, digital compass, and games.

Originally published on CircuitDigest

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

USB to UART/ESP8266 Adapter Programmer for ESP-01 WiFi Modules with CH340G Chip Rs. 99.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
10pcs - 220 ohm 1/4 W Resistor Set Rs. 39.00
MPU6050 - Triple Axis Accelerometer + Gyroscope Module Rs. 438.00
GY-271 QMC5883L/HMC5883L 3-axis Electronic Compass Module Magnetic Field Sensor Rs. 369.00
LDR Light Sensor Module Rs. 49.00
3–6V R140 DC Motor (High-Speed DIY & Toy Motor) Rs. 49.00
Cable for Arduino Nano (USB 2.0 A to USB 2.0 Mini B) 30cm Rs. 69.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

This list includes a generic resistor set as a placeholder — it is not matched to the exact value or part number this circuit needs. The correct one is specified on the original source page linked above; check it before buying.

We don't carry yet: Battery (generic / unspecified)
EEPROM / Memory IC
TFT / Touch LCD
Transistors (BC547 / 2N2222 / TIP / MOSFET)
Pulse / Heart Rate Sensor
SD / MicroSD Card
Header Pins / Terminals / Connectors
Capacitors
Custom PCB / PCB Fab
Enclosure / Box / Case
TTGO Micro-32 V2.0
MAX809T 3V Power supervisor
XC6202P182MR 1.8V LDO

Browse all components

How It Works

This advanced DIY smartwatch is powered by the TTGO Micro-32 V2.0 module, which features an ESP32 microcontroller paired with an IPS6404L PSRAM IC to handle intensive data processing and memory tasks. The system interfaces with a vibrant 1.69-inch TFT display driven by the ST7789V controller, allowing users to navigate custom watch faces and embedded games. Motion tracking and directional orientation are achieved via the MPU6050 accelerometer and HMC5883L magnetometer sensor IC, while the MAX30102 sensor monitors heart rate and vital signs. An ambient light sensor (BH1750FVI) dynamically adjusts display visibility, and haptic feedback is provided through a 10mm vibration motor driven by an S8050 NPN transistor. Power management is a critical subsystem: a Micro USB port and CP2102 USB UART controller handle programming and charging via the MCP7383 1S battery charger. A DW01 battery protection IC and FS8205A MOSFET safeguard the lithium-ion battery against over-current and deep discharge. Voltage regulation is stabilized through an NCP167AMX330TBG 3.3V LDO and an XC6202P182MR 1.8V LDO, with a MAX809T 3V power supervisor ensuring reliable system resets. Data storage is expanded via a Micro SD slot, and user input is processed through custom buttons. The firmware is developed in the Arduino IDE using specialized libraries such as TFT_eSPI, ESP32Time, OneButton, QMC5883L, BH1750, and MAX30105 to manage sensors, display rendering, real-time clock tracking, and peripheral communication over I2C and SPI protocols.

Why Build This

Develop advanced wearable IoT prototypes featuring biometric health tracking and real-time sensor data acquisition.

Integrate complex power management, battery safety circuits, and multi-sensor I2C/SPI communication on a custom PCB.

Program custom graphical user interfaces, interactive watch faces, and games using the Arduino IDE and embedded display libraries.

Real-World Application

Personal health tracking, wearable navigation, fitness monitoring, and custom IoT wearable device prototyping.

Skills You'll Learn

I2C and SPI bus communication

power management and LDO regulation

lithium-ion battery safety implementation

multi-sensor integration

graphical UI rendering on TFT displays

PCB design and hardware debugging

Safety Precautions

Ensure proper handling of Li-ion batteries and verify battery protection circuits (DW01 and FS8205) to prevent over-current and deep discharge risks.

Technology Tags

ESP32

TTGO

TFT DISPLAY

HEART RATE SENSOR

MAGNETOMETER

ACCELEROMETER

AMBIENT LIGHT SENSOR

ARDUINO

PCB DESIGN

WEARABLE TECHNOLOGY

Frequently Asked Questions

Can I use a standard lithium polymer battery without the DW01 and FS8205A protection circuit?

No, the safety note explicitly stresses verifying the battery protection circuits to prevent deep discharge and over-current hazards inherent to unmanaged Li-ion cells.

How do I program the ESP32 microcontroller on this custom board?

Programming is handled via the onboard Micro USB port and the CP2102 USB UART controller using the Arduino IDE with the necessary ESP32 board definitions and libraries installed.

What libraries are required to run the display and sensors?

The project relies on several specific libraries including TFT_eSPI for the screen, ESP32Time for real-time tracking, OneButton for user inputs, and QMC5883L, BH1750, and MAX30105 for the respective sensors.

Gallery

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

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Kitkraft Project Hub — curated from the maker community, credited at the source.

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