Project Hub /IoT & Connected Devices/Telemetry & Remote Logging/How to Flash the Firmware on Clone HM-10 BLE Module using Arduino Uno

Intermediate

ARDUINO

₹500 – ₹1,500

3 – 6 Hours

Complete Kit

How to Flash the Firmware on Clone HM-10 BLE Module using Arduino Uno

Learn how to flash genuine firmware onto a cloned HM-10 BLE module using an Arduino Uno as a programmer, restoring full AT command functionality.

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.

Arduino UNO R3 Board (Compatible) – ATmega328P Microcontroller with USB Cable Rs. 999.00
ESP32 WiFi+Bluetooth CP2102 Development Board Rs. 520.00
USB to UART/ESP8266 Adapter Programmer for ESP-01 WiFi Modules with CH340G Chip Rs. 99.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

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How It Works

The process of flashing firmware onto a cloned HM-10 or CC41 Bluetooth Low Energy module relies on transforming an Arduino Uno into a hardware programmer. Cloned modules frequently run generic or corrupted software that lacks proper AT command responsiveness, rendering them difficult to configure for wireless communication. By uploading the CCLoader sketch to the Arduino Uno, the microcontroller acts as an intermediary bridge between a host computer running the CCLoader Windows program and the CC2541 system-on-chip inside the BLE module. Through a series of designated GPIO pins acting as SPI or debug lines, the CCLoader utility pushes the official HM-10 firmware binary (.bin) directly into the flash memory of the CC2541 chip. Correct wiring of power, ground, and data lines using jumper wires establishes a synchronous communication link necessary for the memory overwrite procedure. Once the flashing sequence completes successfully, the module boots into its new firmware state, restoring full standard AT command sets, stable peripheral advertising, and reliable serial bridging capabilities essential for custom telemetry and remote logging nodes.

Why Build This

Resurrect inexpensive, non-responsive, or bricked CC41/HM-10 clone modules to make them fully functional for DIY IoT prototypes.

Gain practical debugging and low-level firmware flashing experience applicable to embedded systems development.

Enable reliable wireless communication between smartphone applications and custom microcontroller sensor networks.

Real-World Application

Fixing non-responsive or bricked Bluetooth modules for DIY IoT projects, wireless sensor nodes, and smartphone-controlled robotics.

Skills You'll Learn

Microcontroller firmware flashing

serial communication interfacing

hardware debugging

bootloader utilization

embedded system peripheral configuration

Safety Precautions

Exercise caution while soldering delicate wires directly to the microscopic pins of the HM-10 module to avoid permanently damaging or bridging the pads.

Technology Tags

BLUETOOTH LOW ENERGY

HM-10

CC2541

FIRMWARE FLASHING

ARDUINO

AT COMMANDS

SOLDERING

Frequently Asked Questions

Can I use an Arduino Pro Mini instead of an Arduino Uno for this project?

Yes, but if you use a Pro Mini, you will also need a separate USB to TTL converter to connect the board to your computer for the programming process.

Why is my HM-10 module not responding to standard AT commands?

Many inexpensive clone modules ship with altered or missing firmware that lacks the standard AT command stack, which is why flashing the official firmware binary is necessary to restore full functionality.

Do I need to solder wires directly to the module?

Depending on the breakout board version, you may need to solder jumper wires directly to the microscopic breakout pins of the HM-10 module to establish a secure connection with the programmer.

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.

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

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