Modules
HC-05 Bluetooth Module
৳760
Bluetooth 2.0 serial module that pairs with a phone or PC and then behaves exactly like a wireless serial port.
Once paired, anything the microcontroller prints over serial arrives in a terminal app, and anything typed there arrives at the microcontroller. That makes it the simplest way to add wireless control to an existing serial project.
What you can build
- Phone-controlled robots and RC cars
- Wireless sensor readouts to an Android terminal app
- Debugging a project that is awkward to reach with a USB cable
Not sure it will work? Test your circuit free in Tekko Sim — on your phone, in Bangla or English.
| Category | Modules |
| Model no. | HC-05 |
| Availability | In stock |
| In stock | 2 pcs |
| Delivery | Cash on Delivery, nationwide Bangladesh |
| Bluetooth Version | 2.0 + EDR |
| Profile | SPP, Serial Port Profile |
| Module Supply | 3.6–6V on the VCC pin |
| Logic Level | 3.3V on RX and TX |
| Default Baud Rate | 9600 |
| Roles | master or slave, selectable over AT commands |
| Range | roughly 10 m line of sight |
Questions about the HC-05 Bluetooth Module
Can I wire HC-05 RX and TX straight to a 5V Arduino?
The module's TX into the Arduino's RX is fine. The other direction is not — the HC-05 RX pin expects 3.3V and 5V will damage it over time. Put a simple two-resistor divider on that one line.
How do I enter AT command mode?
Hold the small button on the module, or pull the KEY/EN pin high, while applying power. The LED then blinks slowly instead of rapidly and the module accepts AT commands, usually at 38400 baud.
Does HC-05 work with an iPhone?
No. It is Bluetooth Classic SPP, which iOS does not make available to ordinary apps. For an iPhone project use a BLE module or an ESP32, which has BLE built in.
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