AT-09 Bluetooth 4.0 UART Transceiver Module – CC2541 Compatible, HM-10 Clone (with Button for Easy Configuration)

SKU: FA2042
Bluetooth Protocol

Bluetooth Specification V4.0 BLE
Chipset

CC2541 (HM-10 Clone Compatible)
Operating Voltage

3.6V to 6V DC
Logic Level

3.3V / 5V Compatible (I/O)
Frequency

2.4GHz ISM band
Modulation

GFSK (Gaussian Frequency Shift Keying)
Sensitivity

≤-84dBm at 0.1% BER
Transmission Speed

Asynchronous: 6 Kbps; Synchronous: 6 Kbps
Operating Temperature

-5°C to +65°C
Range

~10–20 meters (Open space)
Product Description
The AT-09 is a high-efficiency Bluetooth Low Energy (BLE) 4.0 module designed for ultra-low power consumption and seamless integration with modern mobile ecosystems. Based on the industry-standard CC2541 chipset, it serves as a cost-effective, high-performance alternative to the HM-10 module.
Unlike older Bluetooth 2.0 modules (like the HC-05/06), the AT-09 is specifically engineered for iOS and Android compatibility, making it the go-to choice for app-based hardware control. This specific version features an integrated physical button and level-shifting circuitry, allowing users to easily reset or enter configuration modes without complex wiring. It is the perfect bridge for developers and businesses looking to add “Smart” connectivity to battery-operated devices, wearable tech, and remote sensors.
Key Features
  • iOS & Android Universal Compatibility: Supports Bluetooth 4.0 BLE, allowing direct connection to iPhones and modern Android devices without complex pairing codes.
  • Ultra-Low Power Consumption: Optimized for battery-sensitive applications, with a deep-sleep mode drawing micro-amps.
  • Integrated Level Conversion: Safe for use with both 3.3V and 5V microcontrollers (Arduino, Raspberry Pi, ESP32) thanks to onboard logic-level shifting.
  • Onboard Configuration Button: Features a physical “State/Reset” button for easier AT command entry and factory resetting.
  • High Performance: Features an onboard PCB antenna for stable data transmission and a high-speed CC2541 core.
  • Compact 6-Pin Interface: Standard header pins (State, VCC, GND, TXD, RXD, BRK) for easy breadboard or PCB integration.
Usage & Applications
  • Smart Home IoT: Control lighting, locks, or appliances via custom mobile applications.
  • Wearable Technology: Ideal for fitness trackers or smart jewelry where space and battery life are critical.
  • Industrial Sensor Nodes: Transmit real-time data from remote sensors to a central tablet or gateway.
  • Education & Prototyping: A staple for STEM students and engineers building Bluetooth-controlled robots or wireless data loggers
Q: Is the AT-09 compatible with iPhone/iOS?

Yes. Unlike Classic Bluetooth modules (HC-05/06), the AT-09 uses BLE 4.0, which is fully supported by iOS. You will typically connect via a BLE terminal app rather than the system Bluetooth settings

Q: How does this differ from the HM-10?

The AT-09 is functionally a clone of the HM-10. It uses the same CC2541 hardware and supports most of the same AT command set, but at a more accessible price point for bulk business purchasing

Q: Do I need a logic level shifter for my 5V Arduino?

No. This module includes an onboard voltage regulator and level conversion, making it safe to plug directly into 5V Arduino TX/RX pins

Q: Why can't I find the module in my phone's "Bluetooth Settings"?

BLE devices operate differently than Classic Bluetooth. They often do not show up in the standard system Bluetooth menu. Use a “BLE Scanner” app or a dedicated custom app to detect and connect to the module

Q: What is the purpose of the physical button on the module?

The button allows you to manually reset the module or toggle its state. It is particularly useful when troubleshooting connections or forcing the module back into a discoverable state

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