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$
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New generation LoRa. 2 Ethernet specification. 9 Antenna interface. 15 TX current(mA). 16 RX current(mA). 19 Distance. 17 Receiving sensitivity(dBm). ... more16 Max tx power(dBm).
$
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Location: Los Angeles, United States
Hot stamping technology and plastic inner protection reduce the problems caused by transportation shocks and other processes. New Upgraded Latest Version ... more3.6 Vector Network Antenna Analyzer 10KHz-1.5GHz MF HF VHF UHF with Shell.
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4.40
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Location: Villa Park, United States
1 x MCP2515 Module CAN Bus TJA1050 Receiver Transceiver SPI Arduino. Impedance matching, ensure drive capacity long-distance data transmission against ... moresignal radiation. Support CAN V2.0B specification, the communication speed 1Mb / S.
$
549.28
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Location: Dallas, United States
Onsemi AXM0F343-64-868-1-GEVK Evaluation Kit onsemi AXM0F343-64-868-1-GEVK Evaluation Kit is a complete and flexible, ready-to-go solution for testing, ... moreevaluating, and prototyping with the AXM0F343 Ultra-Low-Power Sub-GHz Wireless SoC.
$
20.00
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Location: Carson City, United States
FoxD1 /dev/ttyS2 RS422 or RS485. FoxD3 /dev/ttyS1 RS422 or RS485. FoxD6 /dev/ttyS4 RS422 or RS485. TerraD10 /dev/ttyS4 RS422 or RS485. TerraD13 /dev/ttyS2 ... moreRS422 or RS485. FoxD8 /dev/ttyS3 RS422. B RS422 RX- line or RS485 B line.
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Transmitting current 277 308 310 mA 30dBm(1W). Default: 433MHz. Communication interface RS232 / RS485. In open and clear air, with maximum power, 5dBi ... moreantenna gain, height of 2m. Air data rate N/A. Self-adapted baud rate.
$
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Location: Edinburg, United States
NEW & ORIGINAL 2 Pieces. Mounting TypeSurface Mount. Data Rate250KBd. Receiver Hysteresis400mV.
$
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Location: China
CH9121 serial port to Ethernet module is equipped with CH9121 network serial port transparent transmission chip. Interface standard: RJ45 interface. RESET: ... moreFactory reset pin, the module power-on detection, active low.
$
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Location: Dayton, United States
(This is for 1) pc of the 74LS245PC IC. Also replaces standard 74LS245 TTL series. 20 Pin DIP. Consolidated Electronics was created in February of 1979.
$
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1 x HM-10 Bluetooth 4.0 Transceiver Module CC2541 CC2540 UART Serial Port. HM-11 can work with IOS, PC, Android 4.3 now. your iPhone/iPAD, IOS 6 or Android ... more4.3 above devices. HM-10 Bluetooth 4.0 Module.
$
1.71
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1PCS ESP8266 Remote Serial Port WIFI Transceiver Wireless Module Esp-12F AP+STA type:ESP-12F. Data interface: UART / HSPI / I2C / I2S / Ir Remote Contorl ... moreGPIO / PWM. Wireless standards: 802.11 b / g / n.
$
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SX1262 LoRa Module 868MHz 915MHz 30dBm SMD Wireless Transceiver E22-900T30S IPEX Stamp Hole 1W Long Distance TCXO Transmitter. [Introduction]: E22-900T30S ... moreis a wireless serial port module (UART) based on SEMTECH's SX1262 RF chip.
$
31.17
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Location: China
Item Description: Free tracking number) Maybe you also nee it: Bluetooth Serial Transceiver Module Base Board Enable clear button For Arduino From Hong ... more1. It is HC-05.Master and slave.Two in one module. 2. Use the CSR mainstream bluetooth chip. Bluetooth V2.0 protocol standards. 3. Module working voltage 3.3 V. 4. Potter default rate of 9600. The user can be set up. 5. The core module size: 28 mm x 15 mm x 2.35 mm. 6. Working current: matching for 30 MA. Matching the communication for 8 MA. 7. Dormancy current: no dormancy. 8. Used for GPS navigation system. Water and electricity gas meter reading system. 9. With computer and bluetooth bluetooth adapter. PDA, seamless connection equipment. Document: material Shipping List: 5PCS* 30ft Wireless Bluetooth RF Transceiver Module serial RS232 TTL HC-05 1PCS*Tracking number to all over the world. We maintain high standards of excellence and strive for 100% customer satisfaction! Feedback is very important to us. We request that you contact us immediately BEFORE you give us neutral or negative feedback. So that we can satisfactorily address your concerns. It is impossible to address issues if we do not know about them! The items you ordered will be shipped out in 1 business day by Hong Kong Air Mail when your payment is clear. The arrival time is 5-20 business days to United States usually. We ensure dispatch the item within 1-2 business days. However. You bought the item from opposite side of the earth, so it needs a little longer time to deliver. Please place order only if you agree with the shipping time and all the terms below. Customs duty is obligation and liability of a citizen in your country. So buyer should be responsible for any tax and custom duty incurred. Generally, the delay or failure delivery is sometimes caused by the policy of different customs. For example, Laser Pointer is unacceptable in some countries. Therefore, please double check your local customs policy carefully before purchase. Or, we will NOT be responsible for any failure delivery r
$
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New generation LoRa. 2 Ethernet specification. 9 Antenna interface. 15 TX current(mA). 16 RX current(mA). 19 Distance. 17 Receiving sensitivity(dBm). ... more16 Max tx power(dBm).
$
15.16
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SX1262 LoRa Module 868MHz 915MHz 30dBm SMD Wireless Transceiver E22-900T30S IPEX Stamp Hole 1W Long Distance TCXO Transmitter. [Introduction]: E22-900T30S ... moreis a wireless serial port module (UART) based on SEMTECH's SX1262 RF chip.
$
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4: iBeacon mode (supports WeChat shake protocol and Apple iBeacon protocol). Indoor room applications (application of iBeacon data acquisition to achieve ... morethe range of positioning). Sensor mode (temperature, humidity, and many other sensor data acquisition applications).
$
10.82
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NRF24L01P Wireless RF Transceiver Module E01-2G4M27D 27dBm SPI 2.4GHz 5km. nRF24L01P+. E01 series 2.4Ghz wireless transceiver module based on nRF24L01P ... morewith SPI interface features small size and various application usage.E01 series modules are embedded with imported electronic parts, such as industrial crystals with high precision and TCXO.
$
17.45
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This chip has 32K of flash and 2K of RAM. This LoRa Radio Node uses the extra space left over to add an RFM95 LoRa 915MHz radio module. SX1276 LoRa® based ... moremodule with SPI interface. 1 x LoRa Radio Node v1.0 915MHz.
$
24.61
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CP2102 module, upgraded TYPE-C interface to TTL, support for USB to serial port, support for UART STC downloader;. To put it simply: users can use the ... moreCJMCU-CP2102 to convert USB interfaces to RS232 interfaces.
$
0.99
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Location: China
Note:It's HC-05 Bluetooth module Slave and master two in one module. Use the CSR mainstream bluetooth chip, bluetooth V2.0 protocol standards. this module ... morecan be set to a transmitter or receiver, transmitter could pairing with receiver, receiver and receiver or transmitter and transmitter can't communication between, receiver could pairing with computers and cell phone bluetooth, when buying, the default for receiver.
$
15.16
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Location: China
SX1262 LoRa Module 868MHz 915MHz 30dBm SMD Wireless Transceiver E22-900T30S IPEX Stamp Hole 1W Long Distance TCXO Transmitter. [Introduction]: E22-900T30S ... moreis a wireless serial port module (UART) based on SEMTECH's SX1262 RF chip.
$
35.90
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Condition: New
Location: China
LoRa spread spectrum, strong anti-interference ability. - Support RS232 and RS485 signals. - 1 x LORA Module With 3M/9.8FT Antenna. - At least two LORA ... moremodules are required to use. - Working frequency band: 410-525Mhz.
$
3.82
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Location: China
Brief Introduction. Support Master and Slave mode. Modify by AT commander- This Module can easily transfer the UART data through the wireless Bluetooth- ... moreWithout complex PCB layout or deep knowledge in the Bluetooth software stack- You can combine this bluetooth module with your system. Product Features* Size: 37 x 17(L x W) Operating Voltage:3.3V Operating Frequency Band:2.4GHz unlicensed ISM band. Bluetooth Specification:V2.0+EDR Output Power Class:Class 2 Flash Memory Size:8Mbit Color:Blue. Package Include. 1*Bluetooth transceiver module* The item will shipped out with a tracking number* Payment. Only paypal payment will be accepted. Payment must be made in 3 working days after auction against UPI Case. Shipment. We ship worldwide. For US buyer. Items will be shipped by China EUB. For buyer from other countries, items will be shipped by Register Airmail which can be tracked. As it is international shipment. Buyers should take shipping time and custom declaration in to consideration before buying. The normal shipping time will be 15-30 working days. If you have any questions about the shipment, you can send us an email about your question, we will try our best to solve it. 24 working hours shipped out on your payment received. It will take 3-5 working days to update the tracking information. If you have bought multiple items from us. You can send us one payment for all the items instead of paying for them individually. When you click the Pay Now Button, ebay will automatically determine if there are other items you have won or purchase from us and will combine them for your review. If you need a fast shipping method such as DHL.UPS,FEDEX,TNT,EMS, please feel free to ask for the difference. About US Topnbest is dedicated to provide various accessory for Raspberry Pi and Arduino including: LCD Display.Fashion looking case, HX1838 IR Control,Dopont wire, Bread board, Heatsink, GY521 Module,
$
3.42
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Location: China
Wireless Serial 4 Pin Bluetooth RF Transceiver Module HC-06 RS232 With backplane, eatures: 1) Wireless serial bluetooth port. 2) With free power adapter ... morebottom board come with well power regulator. User can connect 3.3 to 5VDC and connect TX and RX to your control IO(general 3.3 to 5V digital input output of MCU or arduino IO is ok. Or general TLL IO) 3) Easy to connect this module with PC. Just search and key"1234" passcode. 4) With white SMD LED on the adapter board. Can see the Bluetooth connection status. Step to connect: 1) Connect the wiring. Power up, while the device is not connected, the bluetooth module board has a white LED flashing. 2) At PC side. Search bluetooth device. 3) Found name called"LINVOR" device. 4) Connect it. And passcode is"1234" 5) While connection is ok. You can see the LED become always on. 6) Enjoy. Basically. User can only use 2 to 5 pin in most of the application. PIN, NAME, FUNCTION, 1, KEY, For configuration use(normally not connected) 2, VCC, 3.3 to 5V input, 3, GND, Ground, 4, TXD, TX transmit pin, 5, RXD, RX receive pin, 6, STATE, Connection status, Industrial serial port bluetooth. Drop-in replacement for wired serial connections, transparent usage. You can use it. Simply for a serial port replacement to establish connection between MCU and GPS. PC to your embedded project and etc. Computer and peripheral devices GPS receiver Industrial control. MCU projects Default serail port setting: 9600. N, 8, 1. Pairing code: 1234 Running in slave role: Pair with BT dongle and master module Usage Coupled Mode: Two modules will establish communication automatically when powered. PC hosted mode: Pair the module with bluetooth dongle directly as virtual serial. Bluetooth protocal: Bluetooth Specification v2.0+EDR Frequency: 2.4GHz ISM band Modulation: GFSK(Gaussian Frequency Shift Keying) Emission power: Sensitivity: Speed: Asynchronous: 2.1Mbps(Max) 160 kbps. Synchronous: 1Mbps/1Mbps Security: Authentication and encryption Profiles: Bluetooth serial port. CS
$
1.43
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Location: China
1, the original chip CP2102, generate COM port after installing the driver. 1PCS MICRO USB to UART TTL Module 6Pin Serial Converter CP2102 STC Replace ... moreFT2 32. SUSPEND pins support USB suspend state.
$
223.95
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Condition: New – Open box
Location: Granbury, United States
THIS IS FOR (25 PCS) OF TSB41LV06APZP BY TI. IC TRANSCEIVER HALF 2/2 100HTQFP. Product Category: 1394 Interface IC. Product Type: 1394 Interface IC. Protocol ... moreSupported: 1394. Data Rate: 400 Mb/s.
$
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Location: China
NRF24L01P+. E01 series 2.4Ghz wireless transceiver module based on nRF24L01P with SPI interface features small size and various application usage.E01 ... moreseries modules are embedded with imported electronic parts, such as industrial crystals with high precision and TCXO.
$
6.98
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Condition: New
Location: China
Data interface: UART / HSPI / I2C / I2S / Ir Remote Contorl GPIO / PWM. Wireless standards: 802.11 b / g / n. Working Current: Average: 80mA.
$
7.10
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Condition: Neu
Location: China
OLED LED&RGB. Nano Sheild. Diversified product interface options, three optional: MINI USB interface, Micro USB interface, Type-C USB interface. Am 13.12.2023 ... morehat der Verkäufer die folgenden Angaben hinzugefügt.
$
11.88
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Condition: New
Location: China
Si4463 is a high-performance low current 433MHz transceiver is a EZRadioPRO series, including a complete transmitter and receiver. Si4463 has a narrow-band ... morephase noise and better concession band applications, with blocking and select properties, such as, FCC Part90 and 169MHz wireless MBus.
$
26.46
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Condition: New
Location: China
CP2102 module, upgraded TYPE-C interface to TTL, support for USB to serial port, support for UART STC downloader;. To put it simply: users can use the ... moreCJMCU-CP2102 to convert USB interfaces to RS232 interfaces.
$
78.00
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Condition: New
Location: China
Using PC software NanoVNASaver, it can connect to a NanoVNA and extracts the data for display on a computer, and for saving to Touchstone files. We can ... moreexport Touchstone (snp) files for various radio design and simulation software through PC software.
$
7.67
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Location: United States
This is a simple socket board which is for NRF24L01 Wireless module. It's for 8 Pin NRF24L01+ Module. CP2102 MICRO USB to UART TTL 6Pin Serial Converter ... moreSTC Replace FT232 Module US.
$
9.36
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Location: United States
1 x 5Pin Jumper Wire. Item Type: USB to TTL Serial Converter Module. On‑board status indicator and the transceiver indicator will stay on after the correct ... moreinstallation of the drive, the transceiver indicator will flash when communicating.
$
3.88
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Condition: New
Location: China
Product Name: 1pcs Slave HC-06 Wireless Bluetooth Transeiver RF Module Serial+4p Port line new SKU: 213 7 Parsts No. Package: Brand: Quantity: 1 Description? ... moreWireless serial Bluetooth port with free extension cable? Include mezzanine board that includes regulator and connector to allow easy intoerface to and Arduino. AVR, PIC or other microcontroller. Supply voltage can be between 3.6 to 6V DC. Unpaired current is about 30 ma.And it's about 10mA after paired.Pls notice the input voltage cann't exceed 7V. Easy to connect this module with any standard Bluetooth device. Just search and key"1234" passcode. The link from the machine. Computer, Bluetooth with Bluetooth function from the function with a variety of hosts, the majority with a Bluetooth-enabled cell phone, PDA, PSP and other intelligent terminal pair pairing between slave can not. For more quantity. Please contact me.My skype: ada-yu2013) The Standard shipping we provide is non-regiested mail without a tracking. We provide free shipping with tracking number when your order is over $50. If your oder is below $50 and you need tracking. Please contact me. Maybe you request $ 4.13 + free shipping $ 8.0 + free shipping $ 11.5 + free shipping $ 18.0 + free shipping $ 28.0 + free shipping For more quantity. Please contact us 1) We accept PayPal payment ONLY. inkfrog terapeak. I000000.
$
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Location: Jamaica, United States
(1) Chip: CH340C. CH340 built-in independent transceiver buffer, support for simplex, half duplex or full duplex asynchronous serial communication. A ... morevery small size USB to TTL serial module, the module uses Micro USB interface, compatible with Ardroid data cable, the module width and Android data cable plug width, directly inserted in the data line Micro USB plug to use, very small and convenient.
$
15.95
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Condition: New – Open box
Location: Granbury, United States
Function: Transceiver. Manufacturer: Analog Devices Inc. Duplex: Full Duplex. Output Type: Multi Protocol. Number of Drivers: 1 Driver. RoHS: Details.
$
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Condition: New
Location: China
Wireless Network Mode:station/softAP/SoftAP+station. Wireless Standard:802.11b/g/n. We will be happy to resolve. If you don't receive. very important ... moreto us. issues if we do not know about them! any issues you may have in a cordial and friendly manner.
$
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Condition: Used
Location: Sacramento, United States
(The MC68040 microprocessor has a floating-point coprocessor; the MC68LC040 does not.). Tested to power on, not available to test further. Provides up ... moreto 16 Independently Programmable Serial Ports on a Single Board.
$
10.82
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NRF24L01P Wireless RF Transceiver Module E01-2G4M27D 27dBm SPI 2.4GHz 5km. nRF24L01P+. E01 series 2.4Ghz wireless transceiver module based on nRF24L01P ... morewith SPI interface features small size and various application usage.E01 series modules are embedded with imported electronic parts, such as industrial crystals with high precision and TCXO.
$
9.99
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Location: Katy, United States
The module supports UART interface, and supports Bluetooth SPP serial protocol. Connected with Iphone 4S and Android 4.3 above. Automation data acquisition. ... moreBluetooth Certification: ROHS REACHApplications.
$
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Location: China
Support six channels of data reception (pair of six). On-board 2.4G PCB antenna, ISM band, standard pin DIP 2.54mm pitch interface, compact size for embedded ... moreapplications. No.5 MOSI Input Module SPI data input pins.
$
4.31
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Location: China
Wireless standard: 802.11 b / g / n. Data interface: UART / HSPI / I2C / I2S / IR Remote Contorl / GPIO / PWM. Wireless network mode: station / softAP ... more/ SoftAP + station. Upgrade firmware: local serial port burn, cloud upgrade, host download burn.
$
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Location: China
When connecting with the P0 port of the 51 series single-chip microcomputer, a 10K pull-up resistor needs to be added, and it is not necessary to connect ... morewith the remaining ports. If it exceeds 10mA, it needs to be divided by a series resistor, otherwise it is easy to burn the module!
$
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Condition: New
Location: China
1 x HM-10 CC2541 CC2540 4.0Bluetooth UART Transceiver Module Transparent Serial Port. 1PCS x HM-10 CC2540 CC2541 BLE Bluetooth 4.0 Serial Wireless Module. ... moreHM-10 Bluetooth Transceiver. This small size Bluetooth 4.0 TTL transceiver module allows your target device communicate with.
$
6.33
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Location: China
1 Pcs HC-06 Wireless Bluetooth Transceiver RF Module Serial 4 Pin. After the Bluetooth connection automatically switches to transparent mode. full-duplex ... moreserial port to use later, when paired, without knowing any Bluetooth protocol, but only supports 8 data bits, 1 stop bit, no parity communication format, which is the most common communication format, not support other formats.
$
4.04
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Location: China
When connecting with the P0 port of the 51 series single-chip microcomputer, a 10K pull-up resistor needs to be added, and it is not necessary to connect ... morewith the remaining ports. If it exceeds 10mA, it needs to be divided by a series resistor, otherwise it is easy to burn the module!
$
10.69
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$3.00 Shipping
Condition: New
Location: China
Si4463 is a high-performance low current 433MHz transceiver is a EZRadioPRO series, including a complete transmitter and receiver. Si4463 has a narrow-band ... morephase noise and better concession band applications, with blocking and select properties, such as, FCC Part90 and 169MHz wireless MBus.
$
4.95
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$5.15 Shipping
Condition: New – Open box
Location: Granbury, United States
IC TXRX NON-INVERT 3.6V 48TSSOP. THIS IS FOR (2 PCS) OF SN74LVCHR16245AGR BY TI. Width: 6.1 mm. Technology: CMOS. Subcategory: Logic ICs. Series: SN74LVCHR16245A. ... moreProduct Type: Bus Transceivers. Product: Standard Transceiver.
$
6.92
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Condition: New
Location: China
SI4463 868MHZ. YJ-14005 is an advanced, low-cost RF transceiver module is a frequency of 868MHz. Excellent receiver sensitivity (-121dBm) ensures a wide ... morerange of high performance excellence connection.
$
9.79
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Condition: New
Location: United States
1 x 5Pin Jumper Wire. Item Type: USB to TTL Serial Converter Module. On‑board status indicator and the transceiver indicator will stay on after the correct ... moreinstallation of the drive, the transceiver indicator will flash when communicating.
$
4.98
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Condition: Neu
Location: China
The core module uses the HC-05 slave module. The outgoing interface includes VCC, GND, TXD, RXD, KEY pins, and the Bluetooth connection status pin (STATE). ... moreThe output is low when not connected, and high after connection.
$
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Location: China
2-Channel Isolated RS485 Expansion HAT for Raspberry Pi, SC16IS752+SP3485 Solution, with Multi Onboard Protection Circuits. Due to its fast communication, ... morestability, reliability, and safety, it is an ideal choice for fields like industrial automation.
$
6.49
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Condition: New
Location: China
2PCS HC-06 30ft Wireless Bluetooth RF Transceiver Module RS232 TTL Module. TTL data transparent transfer between a host Bluetooth device. Bluetooth specification ... morev2.0 + EDR. Works with any USB Bluetooth adapters.
$
7.54
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Condition: Neu
Location: China
Adopts the new CH343G chip, plug and play, compatible with windows series, MacOS series, Linux and other systems. Device interface: RS485/RS232 (switch ... morethrough the dip switch). RS485/RS232 interface.
$
2.11
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Condition: Neu
Location: China
But for engineers, both parallel and serial ports are essential interfaces, especially the serial port. For the computer without a serial port, the most ... moreconvenient solution is to use the USB to serial chip to virtualise a serial port out of many manufacturers have produced such a chip, such as silicon LABS CP210x series, TI's TUSB3410, Nanjing Qinheng CH34x series, FTDI FT232 series, Prolific's PL230x series, Aike's ARK34x series, FTDI FT232 series, FTDI FT232 series, Prolific's PL230x series.
$
6.43
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Location: China
Adopts the new CH343G chip, plug and play, compatible with windows series, MacOS series, Linux and other systems. A+TXD: RS485 connects to A, RS232 connects ... moreto RXD. B-RXD: RS485 connection B, RS232 connection TXD.
$
11.18
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Condition: New
Location: United States
Wireless Serial 4 Pin Bluetooth RF Transceiver Module HC-06 RS232 With backplane, eatures: 1) Wireless serial bluetooth port. 2) With free power adapter ... morebottom board come with well power regulator. User can connect 3.3 to 5VDC and connect TX and RX to your control IO(general 3.3 to 5V digital input output of MCU or arduino IO is ok. Or general TLL IO) 3) Easy to connect this module with PC. Just search and key"1234" passcode. 4) With white SMD LED on the adapter board. Can see the Bluetooth connection status. Step to connect: 1) Connect the wiring. Power up, while the device is not connected, the bluetooth module board has a white LED flashing. 2) At PC side. Search bluetooth device. 3) Found name called"LINVOR" device. 4) Connect it. And passcode is"1234" 5) While connection is ok. You can see the LED become always on. 6) Enjoy. Basically. User can only use 2 to 5 pin in most of the application. PIN, NAME, FUNCTION, 1, KEY, For configuration use(normally not connected) 2, VCC, 3.3 to 5V input, 3, GND, Ground, 4, TXD, TX transmit pin, 5, RXD, RX receive pin, 6, STATE, Connection status, Industrial serial port bluetooth. Drop-in replacement for wired serial connections, transparent usage. You can use it. Simply for a serial port replacement to establish connection between MCU and GPS. PC to your embedded project and etc. Computer and peripheral devices GPS receiver Industrial control. MCU projects Default serail port setting: 9600. N, 8, 1. Pairing code: 1234 Running in slave role: Pair with BT dongle and master module Usage Coupled Mode: Two modules will establish communication automatically when powered. PC hosted mode: Pair the module with bluetooth dongle directly as virtual serial. Bluetooth protocal: Bluetooth Specification v2.0+EDR Frequency: 2.4GHz ISM band Modulation: GFSK(Gaussian Frequency Shift Keying) Emission power: Sensitivity: Speed: Asynchronous: 2.1Mbps(Max) 160 kbps. Synchronous: 1Mbps/1Mbps Security: Authentication and encryption Profiles: Bluetooth serial port. CS
$
39.19
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Location: China
TTL data transparent transfer between a host Bluetooth device. 10PCS Wireless Bluetooth RF Transceiver Module. Use the CSR mainstream bluetooth chip, ... morebluetooth V2.0 protocol standards. this module can be set to a transmitter or receiver, transmitter could pairing with receiver, receiver and receiver or transmitter and transmitter can't communication between, receiver could pairing with computers and cell phone bluetooth, when buying, the default for receiver.
$
34.57
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Free Shipping
Condition: New
Location: China
Transmitting current 277 308 310 mA 30dBm(1W). Default: 433MHz. Communication interface RS232 / RS485. In open and clear air, with maximum power, 5dBi ... moreantenna gain, height of 2m. Air data rate N/A. Self-adapted baud rate.
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