ReSpeaker Mic Array v3.0 with 4-Mic Array and XVF3000 Voice Processor -Seeed Studio The ReSpeaker Mic Array v3.0 is a powerful 4-microphone USB voice array designed for crystal-clear voice interaction and intelligent audio applications. Equipped with the advanced XMOS XVF-3000 chipset, it supports far-field voice capture, making it ideal for smart speakers, voice assistants, and human-machine interaction projects. This compact module features 12 programmable RGB LED indicators for intuitive visual feedback, along with robust speech processing technologies such as Voice Activity Detection (VAD), Direction of Arrival (DOA), beamforming, noise suppression, de-reverberation, and acoustic echo cancellation. With support for USB Audio Class 1.0 (UAC 1.0), it integrates seamlessly with PCs, Raspberry Pi, and other development platforms. Perfect for developers and innovators, the ReSpeaker Mic Array v3.0 offers reliable performance for building high-quality far-field audio capture modules. Features: Far-Field Voice Capture – Detects voices clearly from a distance for accurate audio input. USB Audio Class 1.0 (UAC 1.0) Support – Ensures easy plug-and-play compatibility with various devices. 4-Microphone Array – Provides enhanced audio input precision and multi-directional capture. 12 Programmable RGB LED Indicators – Customizable lights for visual interaction and feedback. Advanced Speech Algorithms – Built-in processing for reliable voice recognition. Voice Activity Detection (VAD) – Identifies when speech is present to optimize processing. Direction of Arrival (DOA) – Determines the source direction of the speaker’s voice. Beamforming Technology – Focuses on the target voice while reducing background noise. Noise Suppression – Minimizes ambient sounds for clear communication. De-Reverberation – Reduces echo effects in reflective environments. Acoustic Echo Cancellation (AEC) – Eliminates playback interference for clean voice input. Applications: Speech algorithms and features USB Voice Capture Smart Speaker Intelligent Voice Assistant Systems Voice Recorders Voice Conferencing System Meeting Communicating Equipment Voice Interacting Robot Car Voice Assistant Other Voice Interface Scenarios ReSpeaker Mic Array v3.0 Diagram: Hardware Overview Pinout Diagram Dimensions

Features: Compact size and easy to assemble. LED indication on Remote Control module for easy output identification. Arduino based microcontroller board with in built motor driving circuitry. Onboard programming port which can be used for modification and upgradation. Line Follower Robot Quick start Guide: This kit will contain a quick start guide containing manual about how to assemble the bots, calibration of sensors according to requiring, programming files and related video. Requirement: For assembling the bot you need appropriate size of screwdrivers .You just need to put on the power supply and your auto-bots is ready to go. The microcontroller provided will be pre-programmed but modification can be made easily by the provided programming port. Package content: The kit comes in a designed box with all the mechanical and the electrical components. Electronic Components: Arduino controller board(1), Motor Driver Board (1), Remote Control module, connecting wires Mechanical Components: Chassis set, Wheels and motors, Caster wheel, Screws, nuts and spacers.

DC 5V 433Mhz RF Wireless Transmitter Module and Receiver Kit The TX-ASK is an effective low-cost solution for using the 433 MHz frequency. This ASK hybrid transmitter module is designed with a saw resonator, making it small, cost-effective, and easy to use for designing. However, it's important to note that this 433mhz rf transmitter and receiver kit does not support direct UART communication when connected to PCs or microcontrollers due to the high levels of noise on these frequencies. The RF module comprises a 433mhz rf transmitter and receiver. The transmitter receives serial data and wirelessly transmits it through RF via its antenna connected at pin4. The transmission rate can be set to 1kbps or 10kbps. The transmitted data is received by an RF receiver operating at the same frequency as the transmitter. This 433 MHz RF transmitter and receiver pair is cost-effective and can transmit signals up to 100 meters (although the antenna design, working environment, and supply voltage will significantly impact the effective distance). It's ideal for short-distance battery-powered device development. read more : RF 433 MHZ TRANSMITTER AND RECEIVER (WITH DEMO) Video Tutorial: Applications: Remote Controls Automation System Wireless Security System Sensor Reporting Car Security System Remote Keyless Entry

RF433 MHz Transmitter Receiver Wireless Module This 433 MHz wireless RF module is a superheterodyne ASK (Amplitude Shift keying ) / OOK (On-Off keying based ) module. The design idea is to use a SAW filter, highly suitable for industry control or bad place for use, with strong anti-jamming. Built-in automatic gain circuit (AGC), will automatically change front-end LNA gain among received signal strength also make signal output not be strong or weak signals caused by phase distortion so that it can rise higher sensitivity. To receive the local oscillation circuit for the PLL lock loop design, no offset, and stability is high. The frequency is 433MHz and the receiver structure is Superheterodyne, the received signal is OOK. After receiving the signal, it will output the TTL signal to the external decoder IC for decoding. It is convenient to the applicant in different products and external components are not necessary to make products wireless and also bring value-added for your products. read more: RADIO FREQUENCY Applications: Remote Controls Automation System Wireless Security System Sensor Reporting Car Security System Remote Keyless Entry

RFID Access Control Door Lock External reader one weigand26 interface. Lock interface relay output or level output Exit button one interface Bellone interface.

RFID Card R/W This is a 13.56 Mhz RFID Card used for Contactless transmission of data and supplies energy with no battery needed. Its Operating distance is Up to 100mm, depending on antenna geometry. Operating frequency is 13.56 MHz and Data transfer speed is 106 kbit/s. RFID Cards are frequently used as personal identifiers in personnel management or access control systems. This is a version of the popular ISO format identity card. It is featured with Data integrity of 16 Bit CRC, parity, bit coding bit counting which allows Anti-collision. These cards are typically used in ticketing transaction: <100 ms including backup management. Also check RFID Card Read , and it is part of the RFID/NFC category in the IOT & Wireless section. The RFID card reader allows for contactless communication between a reader and an RFID tag or card. It is commonly used in applications such as asset tracking, inventory management, and access control systems. Applications : Public transportation Access control Event Ticketing Gaming & identity

RFID Card Read RFID, or radio-frequency identification, is a technology that allows for contactless communication between a reader and an RFID tag or card. RFID card readers can be used in various applications, including asset tracking, inventory management, and access control systems. RFID Cards are frequently used as personal identifiers in personnel management or access control systems. This is a version of the popular ISO format identity card. Also check 125KHz RFID Card R/W . It is a contactless transmission card used for data transfer and energy supply without the need for a battery. The card operates at a frequency of 125KHz with a data transfer speed of 106 kbit/s. It has an operating distance of up to 100mm, depending on antenna geometry. Also check the 125KHz RFID Keychain (read) available on the Iotcart website. It is a 125kHz RFID Tag used for sensing and identifying people and objects for access control and automation. Operating on a frequency of 125kHz, the tags come pre-programmed with unique ID numbers.

RFID Reader Serial The RFID Reader Module has an inbuilt antenna in minimized form factor. designed to work on the industry standard carrier frequency of 125 kHz. Sensitivity Range is about 6cm from antenna. Internal antenna on the PCB Buzzer to detect the proximity cards. Blue LED blinking to show that the RFID reader is powered on. Direct TTL output that can be directly coupled with most of the microcontrollers without max232. Operates at 5v with 500ma of current. Microcontroller to decode the data into Serial o/p. Rs232 to convert signal into TTL to RS232 (optional). The LF module is best suited for applications in Access Control,Time and Attendance, Asset Management, Handheld Readers,Immobilizers, and other RFID enabled applications.

RFM69 FSK Transceiver Module The RFM69 series wireless communication module is intended for global free application at the 434 MHz ISM band. It is a low-power, high-bandwidth module with low cost, stability, and product consistency, capable of transmitting data packets up to 300Kbps. The module has broad applications, including daily life activities that require wireless connection, industrial control, access control, attendance, surveillance, and security industries. The RFM69HCW variant of the module communicates with a host microcontroller using an SPI and supports up to 256 networks with 255 nodes per network. It features AES encryption for data privacy and can transmit data packets of up to 66 bytes long. The RFM69HCW operates at 915MHz frequency and can transmit up to 100mW at 300kbps. These values can be adjusted to match specific application requirements, with an option to maximize range by increasing transmit power and reducing data rate or reducing both for short-range sensor networks with low battery consumption. The module can cover a considerable distance at full power, reaching over 500 meters in open air or transmitting from space to the ground using more complex antennas and modulation schemes. The RFM69 series has various models with different characteristics such as MCU, power amplifier, data interface, and packaging methods. These models can communicate with each other, meeting FCC/CE standards and satisfying clients' authentication needs. Features Transceiver module capable of operation over a wide frequency range, including the 315, 433, 868, and 915MHz license-free ISM frequency bands Programmable RF communication parameters Operates using FSK, GFSK, MSK, GMSK, and OOK modulations Built-in bit synchronizer performing clock recovery, incoming sync word recognition, and automatic RF sense with ultra-fast AFC Packet engine with CRC-16, AES-128, and a 66-byte FIFO Optimized for low power consumption while offering high RF output power and channelized operation Can communicate over several hundred meters given adequate antenna Applications Medical device and remote control Logistics tracking. warehouse inspection. electronic tags Consumer wireless applications Low power telemetry Wireless sensor network applications

RFM96W MHz Wireless LoRa Module The RFM96W 433 MHz Wireless Receiving LoRa Module is the ultimate solution for long-range communication needs. Crafted with cutting-edge technology, it excels in ultra-long-range spread spectrum communication, ensuring high interference immunity and minimal power consumption. Whether it's Automated Meter Reading, Home Automation, or Industrial Monitoring, this LoRa communication module delivers unmatched performance. Made with the patented LoRaTM modulation technique, the RFM96W achieves a sensitivity of over -148 dBm. The integrated +20 dBm power amplifier, along with programmable bit rate and LoRaTM modem, ensures a link budget that outshines industry standards. This LoRa module is perfect for Arduino projects like Wireless Alarm Systems, Security Systems, and applications requiring extended range. The RFM96W's versatility extends to its use in Long-range Irrigation Systems, resolving the traditional compromise between range and selectivity. Its high sensitivity, robust power output, and programmable features make it an indispensable tool in diverse scenarios. Crafted for durability and performance, the RFM96W LoRa transmitter and receiver come with a low RX current of 10.3 mA, ensuring efficient operation. The fully integrated synthesizer with a resolution of 61 Hz adds to its reliability. The module's compatibility with various modulation techniques makes it suitable for FSK, GFSK, MSK, GMSK, LoRaTM, and OOK modulation. Features: LoRaTM Modem. 168 dB maximum link budget. +20 dBm – 100 mW constant RF output vs. V supply. +14 dBm high-efficiency PA. Programmable bit rate up to 300 kbps. High sensitivity: down to -148 dBm. Bullet-proof front end: IIP3 = -12.5 dBm. Excellent blocking immunity. Low RX current of 10.3 mA, 200 nA register retention. Fully integrated synthesiser with a resolution of 61 Hz. FSK, GFSK, MSK, GMSK, LoRaTM and OOK modulation. Built-in bit synchronizer for clock recovery Applications: Automated Meter Reading. Home and Building Automation. Wireless Alarm and Security Systems. Industrial Monitoring and Control Long-range Irrigation Systems Also check SX1278 LoRa Module Ra- 02 433MHZ Wireless Spread Spectrum Transmission . The Ra-02 is based on LoRa spread spectrum technology, which enables long-range communication. LoRa RFM95 Tutorial Ra-02 HopeRF module comparison RFM95W