Does it tarnsmit and receive or just one?

HC-05 is fully bi-directional - it will emulate an RS232 serial link. However, note that it will not communicate with IOS devices.

Could two of these communicate with each other, or does a phone have to be one of the communicators?

Good day, I hope this answer is useful for you. After the pairing is successful, it can be used as a full-duplex serial port. No need to understand any Bluetooth protocol, but only supports 8 data bits, 1 stop bit, and no parity communication format. This is also the most commonly used communication format, other formats are not supported. The interface is 3.3V, which can be directly connected to various microcontrollers (for Arduino/ 51/ AVR/ PIC/ ARM/ MSP430, etc.), and 5V microcontrollers can also be directly connected. Connect directly to the serial port of the single-chip microcomputer, and cannot pass through the MAX232 chip!

Size is 37.5mm * 16.5mm * 4mm(L * W * H)

Its pins, are they outputing rs 232 or ttl signal?

It's neither but for interfacing treat them as TTL, 0-5 volts.

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HC-05 Wireless Bluetooth Receiver RF Transceiver Module Serial Port Transmitter Module

HC-05 Wireless Bluetooth Receiver RF Transceiver Module Serial Port Transmitter Module

Product ID: 335021507

Details

Brand
Newzoll
Compatible devices
Desktop
Data link protocol
Bluetooth
Hardware interface
Bluetooth
Product dimensions
38L x 17W x 4H

📏Compact 37.5x16.5x4mm size

📡10m open area Bluetooth transmission range

🔋3.6V-6V input voltage with onboard 3.3V regulator

113.83 DT

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Description

🚀 Elevate your IoT game with the ultra-compact HC-05 Bluetooth powerhouse!

DUAL MODE FLEXIBILITY - Switch effortlessly between Receiver & Transmitter via AT commands
INSTANT STATUS FEEDBACK - LED indicators keep you in the know—connection or AT mode at a glance
POWER EFFICIENT PAIRING - Only 10mA current when paired, saving your device’s battery life
UNIVERSAL COMPATIBILITY - Works flawlessly with 3.3V & 5V microcontrollers for versatile projects
SEAMLESS SERIAL COMMUNICATION - Plug & play with Arduino, AVR, PIC & more—no MAX232 needed

The HC-05 Wireless Bluetooth Module is a compact, low-power RF transceiver designed for seamless serial communication. Operating at 3.6V-6V with an onboard 3.3V regulator, it supports a 10-meter Bluetooth range and easy integration with popular microcontrollers without extra interface chips. Featuring dual RX/TX modes switchable via AT commands and real-time LED status indicators, it’s the go-to module for professional-grade wireless data transmission.

Specifications

ASIN	B01MQKX7VP
Best Sellers Rank	#127,288 in Computers ( See Top 100 in Computers ) #1,245 in Motherboards
Brand	Newzoll
Compatible Devices	Desktop
Compatible devices	Desktop
Customer Reviews	4.8 out of 5 stars 35 Reviews
Data Link Protocol	Bluetooth
Data Transfer Rate	9600 Megabits Per Second
Data link protocol	Bluetooth
Data transfer rate	9600 Megabits Per Second
Hardware Interface	Bluetooth
Hardware interface	Bluetooth
Item Dimensions L x W x H	38L x 17W x 4H millimeters
Item Weight	0.02 Kilograms
Manufacturer	Newzoll
Mfr Part Number	4350280737
Model Number	4350280737
Product dimensions	38L x 17W x 4H millimeters
UPC	611138946834

Reviews

S**4

ممتازة

27.11.2023

A**R

HC-05 Wireless Bluetooth Receiver RF Transceiver Module Serial Port Transmitter Module

Works Grate

27.08.2024

E**T

Use a bigger capacitor and you're good

If you've got servos and other hardware on the same rail, use bigger caps to cushion the voltage blows as well as divide your 5v incoming power to 3.3v otherwise it will continually reset. It still resets from time to time be less frequently after the larger caps and 3.3v.

5.12.2019

S**N

Good product

This worked exactly as expected.

2.08.2018

G**.

Four Stars

Hc05 not for ISO but works good with android

21.07.2017

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113.83 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Tunisia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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