AT-09 Bluetooth 4.0 UART Transceiver Module – CC2541 Compatible, HM-10 Clone (without Button for Easy Configuration)

SKU: FA2042-1
Bluetooth Protocol

Bluetooth Specification V4.0 BLE
Chipset Core

CC2541 (High-Stability Architecture)
Operating Voltage

3.6V to 6.0V DC
Logic Level (I/O)

3.3V / 5V TTL Compatible
Working Current

~9.0mA (Active); <500µA (Sleep Mode)
Default Baud Rate

9600 bps
Frequency Range

2.4GHz ISM Band
Modulation Mode

GFSK (Gaussian Frequency Shift Keying)
Transmission Range

10–15 Meters (Line of Sight)
Physical Dimensions

27mm x 13mm (Module) / 37mm x 15.5mm (with Baseboard)
Product Description
The AT-09 Standard Version is a professional-grade Bluetooth Low Energy (BLE) 4.0 module designed for seamless serial wireless data transmission. Based on the robust CC2541 chipset, this module is the industry-standard “HM-10” style transceiver, favored for its ultra-low power consumption and broad compatibility with modern mobile ecosystems.
This specific version is designed without an external physical button, providing a sleeker, lower profile that is ideal for permanent installation within tight enclosures or custom-molded cases. It functions as a transparent serial bridge: once connected via BLE, data sent to the module’s RX pin is wirelessly transmitted to the paired device, and vice versa. It is the definitive choice for developers requiring a reliable, “always-ready” BLE connection for iOS and Android integration.
Key Features
  • iOS & Android Native Support: Utilizes Bluetooth 4.0 BLE protocol, allowing for driverless connection to iPhones, iPads, and modern Android hardware.
  • Streamlined Low-Profile Design: No external mechanical buttons, reducing the risk of accidental resets and making it easier to mount in slim housings.
  • Advanced Power Management: Engineered for “Green” electronics, featuring deep-sleep modes that draw minimal current, significantly extending the life of battery-powered devices.
  • Dual-Voltage Logic Compatibility: Integrated onboard level-shifting circuitry allows for direct connection to both 3.3V and 5V microcontrollers without additional components.
  • Transparent Serial Bridge: Operates as a standard UART interface, making wireless upgrades to existing wired serial projects effortless.
  • High-Gain PCB Antenna: Optimized trace antenna design ensures a stable connection and consistent throughput in indoor environments.
Usage & Applications
  • Commercial IoT Gateways: Ideal for smart building sensors and HVAC monitoring systems where modules are permanently installed.
  • Medical & Health Devices: Low-power data transmission for portable heart rate monitors or glucose meters.
  • Consumer App-to-Hardware: The primary choice for creating custom apps to control DIY projects, smart lighting, or home automation hubs.
  • Asset Tracking: Low-energy beaconing for warehouse management and inventory tracking
Q: Does this module require a pairing code (PIN)?

BLE 4.0 modules like the AT-09 often do not require a pairing code for a basic connection via an app. However, the default internal PIN is typically 000000 or 123456 if requested by a specific software interface

Q: How do I configure the module without a physical button?

Configuration is handled entirely through AT commands sent via the Serial interface (TX/RX). While the module is not connected to a phone (LED is blinking), it is in command mode and will respond to instructions like AT+NAME or AT+BAUD

Q: Can I use this with an Arduino Uno?

Yes. Because this module has a built-in level converter on the baseboard, you can connect the TX/RX pins directly to your Arduino. No external voltage divider resistors are required

Q: Why does my phone's standard Bluetooth menu not see the AT-09?

This is standard behavior for BLE 4.0. BLE devices are designed to be discovered and connected to from within an application (such as LightBlue, BLE Scanner, or your own custom app) rather than through the phone’s system settings

Q: Is this module compatible with Bluetooth 2.0/3.0 laptops?

The AT-09 is a BLE-only device. It will connect to hardware that supports Bluetooth 4.0 or higher. It is not backward compatible with “Classic” Bluetooth (v2.0) found in older PC hardware.

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