AT-09 / HM-10 BLE 4.0 Bluetooth Module — CC2541, UART, 3.6–6V, Arduino / iOS / Android

AT-09 / HM-10 BLE 4.0 Bluetooth Module CC2541, UART, 3.6–6V, Arduino / iOS / Android

$7.76 USD

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AT-09 / HM-10 BLE 4.0 Bluetooth Module — CC2541, UART, Arduino / iOS / Android

The AT-09 / HM-10 is a compact Bluetooth Low Energy (BLE 4.0) module built on the Texas Instruments CC2540/CC2541 SoC. It provides a transparent UART serial bridge between a microcontroller and BLE-capable smartphones (iOS and Android), making it the go-to module for wireless Arduino projects, IoT sensor data transmission, and BLE peripheral device development.

Key Specifications

Parameter	Value
Module	AT-09 / HM-10
Bluetooth IC	TI CC2540 / CC2541
Bluetooth Version	BLE 4.0 (Bluetooth Low Energy)
Interface	UART (TX, RX, VCC, GND)
Supply Voltage	3.6V – 6V
Operating Temperature	-40°C to +85°C
Range	Up to 100m (open space)
iOS Compatible	Yes (CoreBluetooth)
Android Compatible	Yes (BLE API)
Configuration	AT commands via UART
Default Baud Rate	9600 bps

BLE vs Classic Bluetooth — Key Differences

Feature	BLE 4.0 (AT-09/HM-10)	Classic Bluetooth (HC-05/HC-06)
iOS Support	✅ Yes (no MFi required)	❌ No
Power Consumption	Very low (μA in sleep)	Higher (mA range)
Data Rate	Up to 1Mbps	Up to 3Mbps
Pairing	No PIN required	PIN required (default 1234)
Best For	IoT, sensors, smartphone apps	Audio, high-throughput data

Why Choose AT-09 / HM-10?

✅ iOS compatible — connects to iPhone/iPad apps without MFi certification
✅ Ultra-low power — μA sleep current for battery-powered IoT nodes
✅ AT command configuration — change name, baud rate, PIN via serial terminal
✅ Transparent UART bridge — no BLE stack knowledge required
✅ 3.6–6V supply — compatible with 3.3V and 5V Arduino boards