Best Serial To Ethernet Adapter Module

5PCS HC-05 Wireless Bluetooth Receiver RF Serial Transceiver Module Master Slave Integrated Bluetooth Module 6 Pin Wireless Serial Port Communication BT Module

HC-05 Bluetooth Module is an easy to use Bluetooth SPP (Serial Port Protocol) module, designed for transparent wireless serial connection setup..
Default baud rate:9600, Button: Press the button.
the module enter the AT mode. AT commands are executed only in AT mode..
HC-05 is able to operate in both master and slave mode. Its communication is via serial communication which makes an easy way to interface with controller or PC. It's ideal replacement to your wired serial connection..
HC-05 Wireless BT Module: with this HC 05 Bluetooth module,You can quickly add the Bluetooth feature to your motherboard project, and then you can use your android phone to control some gadgets, such as: switch, LED..
Note: The module doesn’t suitable for IOS system..

NOYITO 2-Channel Micro USB Relay Module is equipped with a stable USB to serial port chip and a microcontroller. It can use the serial port debugging software to send serial commands on the computer to control the opening and closing of the 2-channel relay..
Onboard high performance microcontroller chip, CH340 USB control chip.With power LED indicator and relay status LED.On-board 2-channel 5V, 10A/250VAC, 10A/30VDC relay, long relay life, can work 100,000 times continuously..
Module with overcurrent protection and relay diode freewheel protection..
NOYITO 8-Channel Micro USB Relay Module ASIN：B09RGTSHHW.
NOYITO 4-Channel Micro USB Relay Module ASIN：B09RGVQXXT.

Industrial serial port bluetooth, Drop-in replacement for wired serial connections, transparent usage. You can use it simply for a serial port....
Operating voltage: 3.3V(Note:SPP-CA Bluetooth module serial port level to 3.3V, if connect 5V level,the system needs to increase the level conversion....
Small size, low power consumption,high sensitivity for send and receive.
Allows your device to both send or receive the TTL data via Bluetooth....
Defaults: Salve, baud rate 9600, Bluetooth name HC-06, pairing password 1234, LED status light on.Core module uses HC-06, leads from the module....
Applications: The Bluetooth module is mainly used for short-range data wireless transmission,such as Bluetooth wireless data transmission,Industrial....