Best Bluetooth Serial Module

SainSmart USB 4 Channel Relay Automation (5V)

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.

Enhanced data rate (EDR) conforms to the 2Mbps and 3Mbps modulation modes of the V2.0.E.2 specification..
Support Bluetooth connection through AT command, set baud rate, password, save parameters after setting parameters..
Bluetooth UART RS232 serial converter module for easy transfer of UART data..
On board 3.3V regulator chip, ROHS compliant, compact size..
Full speed Bluetooth operation, support for full Piconet and Scatternet..

The "Nokia 5110 LCD" interface has been added.
The bluetooth module interface has been added, Convenient Bluetooth wireless serial communication..
The "I2C" communication interface has been added Compatible with Arduino UNO.

Fast card reading: convenient and fast time-saving card reading time is less than 1s, card reading distance is less than 0.5s, card reading time is less than 0.2s. Card reading distance: 0~80mm.
Sensitive reading: The internal radio frequency module and its in-line expansion controller are used to read the card sensitively..
Non-slip design: The back of the card reader is a non-slip design with four corners. It is not easy to slide down and can be fixed more stable..
Button material: See the use of high-quality crystal materials, special craftsmanship, wear-resistant, easy to clean, comfortable to touch, increase keyboard life..
Supporting:With PS/2 keyboard interface, USB interface for keyboard emulation, RS-232 serial output, RS-485 serial output. 2.4GHz/Bluetooth wireless transmission..

HK-ESP32-CAM-MB adopts Micro USB interface, convenient and reliable connection method, convenient to apply to various IoT hardware terminal occasions..
it is new WiFi+Bluetooth dual-mode development board based on ESP32 design, using PCB on-board antenna, with 2 high-performance 32-bit LX6CPU, using 7-level pipeline architecture, main frequency adjustment range 80MHz to 240Mhz.
Application: Home smart device image transmission.
Wireless positioning system signal and so on..
Low power consumption: deep sleep current is as low as 6mA.
It is a small 802.11b/g/n Wi-Fi + BT/BLE SoC module.
5PCS ESP32-CAM WiFi Bluetooth Board ESP32-CAM-MB Micro USB to Serial Port CH340G with OV2640 2MP Camera Module.

IIC I2C TWI 1602 Serial LCD Module Display for R3 Mega 2560 16x2..
Easy to use. Less I/O ports are occupied, only four - VCC, GND, SDA (serial data line), SCL (serial clock line)..
Support IIC protocol. The I2C LCD1602 library is provided, so you can call it directly..
With a potentiometer used to adjust backlight and contrast.Power supply: +5V, Address of the module: ox27..
Widely Applications: LCD display module based on the popular HD44780 controller, works great with for Mega2560 board and other micro-controllers..

With a USB interface, you can directly use the phone data cable on the computer point of view positioning effect.
GT-U7 main module GPS module using the original UBLOX 7th generation chip, Software is compatible with NEO-6M. GT-U7 module, with high sensitivity,....
USB directly connected to the computer, That is, with the host computer-owned serial port function, no need for external serial module, send IPX....
If you have any issue when using our product,or you need product use documentation, please contact us directly for assistance.we will reply your....

This is a new 2.8 inch serial SPI color display module with touch function.
Designed with one socket for memory card.
With PCB plate (including power supply IC, Memory Card), compatible with 5110 interface.
5V compatible, use with 3.3V or 5V logic.

☆ Premium Quality: Made of premium material, this lcd module display is sturdy, not easy to aging and abrasion resistant, to ensure maximum strength and durability for long lasting usage.
☆ TFT LCD Serial Port Module : The lcd display module is a new 2.8 inch serial SPI color display module. Designed with one socket for sd card and PCB adapter for LCD.
☆ Come With PCB Plate: With PCB plate (including power supply IC, SD), pcb display module is compatible with 5110 interface. Resolution: 128x160.
☆ Support Analog & Hardware SPI: This tft display module supports analog SPI and hardware SPI, less I/O port need. It can be driven by 8051 / AVR / PIC /ARM/STM32. It can be driven with at least four IO.
☆ What You Will Get: If you need the document to download, please contact us. We stand behind all of our them with a 100% product guarantee and promise to give you the best in customer care.