Rf Module 315 mhz consist of transmitter and receiver module used  for transmitting  data via RF. Its frequency range is 315mhxz. They easily fit into a breadboard and work well with microcontrollers to create a very simple wireless data link. They are mostly used in Wireless calling system, burglar alarm, wireless data transmission, automated data acquisition system , DIY projects and many more. It has wider range of working voltage with stable performance.

The module helps to communicate with Arduinos wirelessly. It is mainly transmit and receive the data because it has high volume of application than IR. RF signals travel in the transmitter and receiver even when there is an obstruction. It operates at a specific frequency of 433MHz.

The RFID RC522 use MFRC522 chip designed circuit card reader. It is a highly transmission module for contact less communication. It is suitable for portable handheld devices and smart meters. It consumes low voltage, supports rapid CRYPTO1 encryption algorithm, terminology validation MIFARE products.  It Support ISO14443A frames and error correction with 14443A compatible answer signal.  This module has two-way data transmission rate up to 424kbit/s.  It can be used for taking attendance and many card read/ write projects. Using SPI protocol it can be can be directly loaded into the various reader molds.

Features:

• Current :13-26mA / DC 3.3V, Idle Current :10-13mA / DC 3.3V, Sleep current: <80uA, Peak current: <30mA
• Operating Frequency: 13.56MHz
• Supported card types: mifare1 S50, mifare1 S70, mifare UltraLight, mifare Pro, mifare Desfire
• Physical Characteristics: Dimensions: 40mm × 60mm
• Module Interface SPI Parameters
• Data Transfer Rate: Max. 10Mbit/s

Package Includes:

• 1 x RFID READER/WRITER 13.56MHZ RC522 (ARDUINO COMPATIBLE)

Features

• Very small size
• Light weight (under 4 grams without antenna)
• 433Mhz frequency band
• Receiver sensitivity to -140 dBm
• Transmit power max 30dbm (1000mW @ 9600bps)
• Transparent serial link
• Air data rates up to 250kbps
• Range of approx 1 mile with supplied antennas
• Demonstrated range of several kilometers with a small omni antenna
• Can be used with a bi-directional amplifier for even more range
• MAVLink protocol framing and status reporting
• Frequency hopping spread spectrum (FHSS)
• Adaptive time division multiplexing (TDM)
• Support for LBT and AFA
• Configurable duty cycle
• Built in error correcting code (can correct up to 25% data bit errors)
• Open source firmware
• AT commands for radio configuration
• RT commands for remote radio configuration
• Adaptive flow control when used with APM
• Based on the HopeRF HM-TRP radio module, featuring an SiLabs Si1000 RF microcontroller.
• Upgraded to more convince Molex 1.25mm

Specifications:

• Band: 433MHz
• Antenna connectors: RP-SMA connector
• Output power: 1000mW (30dBm), adjustable between 1-30dBm
• Sensitivity: -140 dBm sensitivity
• Interface: Standard TTL UART
• Connection status: LED indicators

Package Includes:

• Radio Telemetry base station (USB Connection)
• Telemetry Transceiver (Pin Header)
• lead set x 1
• Antenna x 2

*2Km range is only possible when used in proper weather condition, very low air data rate and line of sight Ground-Air. With default settings and full transmit power on both ends the range is around 300-500 meters.

Module Model: LoRa-RA-02, Input Supply Range: 2.5 ~ 3.7VDC, Interface: SPI, Programmable bit Rate: UP to 300Kbps

• Antenna Type: IPEX, Frequency Range: 410-525 MHz, Transmit Power: 18±1 dBm (Max), Operating Temperature: -10 to 85°C, LoRa Spread Spectrum modulation technology
• Constant RF power output at + 20dBm-100mW voltage change, High sensitivity: down to -148dBm, Half-duplex SPI communication, Programmable bit rates up to 300kbps, Supports FSK, GFSK, MSK, GMSK, LoRa, and OOK modulation modes
• 127dB RSSI dynamic range, Automatic RF signal detection, CAD model, and very high-speed AFC, Packet engine with CRC up to 256 bytes, Small footprint dual-row stamp-hole patch package; Dimension: Length-28mm, Width-20mm, Height-5mm, Weight-7gm

• Antenna Included
• Works with Arduino, Raspberry Pi, ARM, AVR, PIC and other controllers
• Longer range than Bluetooth, WiFi, Zigbee
• Applications include, Automated Meter Reading, Home and Building Automation, Wireless Alarm and Security Systems, Industrial Monitoring and Control, Long range Irrigation Systems, Smart City

• Reliable, interference free 2.4GHz AFHDS 2A signal operation.
• 6CH operation, suitable for fixed-wing/glider/helicopter.
• Quick and extremely stable in performance.
• Simple binding procedure.
• Use only 4 * AA batteries for transmitter.