HC-02 Bluetooth 2.0 Serial Module 6pin Compatible HC-05/HC-06

Connect the HC-02's VCC pin to the Arduino's 3.3V or 5V pin (ensure input is within 3.2V-6V), GND to GND, Rx to Arduino's Tx (pin 1), and Tx to Arduino's Rx (pin 0). Use a voltage divider on the Arduino Tx line if using 5V logic to avoid damaging the module's 3.3V Rx pin. Power the Arduino, and the module will be discoverable as 'HC-02' for pairing with the default PIN 1234. Open a serial terminal on the paired device to send and receive data transparently. (Word count: 50)

To enter AT mode, pull the KEY pin HIGH (connect to VCC) before or during power-up. The module's status LED will blink at a slower rate (typically ~2 seconds). Then, communicate via the UART interface at the default baud rate (often 38400 or 9600) by sending 'AT' commands, such as 'AT+NAME=NewName' or 'AT+BAUD=4' for 9600 baud. After configuration, power cycle the module with the KEY pin left floating or LOW to return to normal data transmission mode with the new settings applied. (Word count: 50)

The HC-02 uses Classic Bluetooth SPP, which is not natively supported by iOS. To communicate with an iPhone (4s or later), you need a dedicated BLE (Bluetooth Low Energy) serial port assistant app that can bridge the connection. Alternatively, pair the HC-02 with an Android device or computer running a standard serial terminal app, which then acts as a gateway to relay data to/from the iOS device via a separate network connection like Wi-Fi or internet. (Word count: 35)

During active serial data transmission or reception, the HC-02 draws approximately 30mA from the power supply. In idle but connected state, the current draw remains relatively high as Classic Bluetooth maintains a constant RF link. The module does not feature deep sleep modes like BLE modules. For battery-powered projects requiring ultra-low power, consider using a hardware switch to cut power to the module entirely when not in use or selecting a Bluetooth Low Energy (BLE) module instead. (Word count: 40)