Radio transmitter Feather 32u4 RFM95 LoRa Radio - 868MHz - Adafruit 3078

Radio transmitter/receiver operating in theLoRa standard powered with the rechargeableli-pol batteryor via USB, it is running at frequencies of868/915 MHz. The heart of the module is an 8-bitATmega32u4microcontroller  with a clock frequency of8 MHz, it has the 32 kb of flash memoryand2 KB of RAM. It is ideal forIoTprojects(Internet of Things)or those that require mobility due to the possibility of a powering with theli-polrechargeablebatteryand its powering. In case of detection of a USB power, the module automatically switches the power source and begins to charge the battery.

Integrated radio module based onSX1276 Lora system and yields about2 km rangewhen using a simple antenna in the form of a simple cable soldered to ANT pins.The product is fully compatible withArduino, available is also theLoRalibrary with the set of all instructions to create the connections.The manufacturer also provides examples of source codes on the website.

The list of pins.

• Adafruit Feather 32u4:
  • Processor: ATmega32u4 8MHz
  • Interface: USB, serial, I2C, SPI
  • GPIO pins: 20
  • PWM pins: 7
  • Analog inputs: 10
  • Supported rechargeable batteries: li-pol, 3.7 V
  • The rechargeable battery charging current: 100mA
  • Dimensions: 51 x 23 x 8 mm
  • Weight: 5.5 g
• Radio module:
  • Signal power: up to 100 MW (from 5 dBm to 20 dBm)
  • Current consumption:
    • Sleep mode: 300 µA
    • Broadcasting at full power: up to 120 mA
    • Listening mode: 40 mA
  • The ability to attach the antenna or uFL connectors

• The website of the manufacturer: Adafruit 32u4 Feather
• User manual
• System documentation of SX1276
• Documentation of the RFM95 module
• The scheme and design files