$6.10 Loraduino Board Combines LoRa and Atmega328P MCU

Orange Pi Development Boards

We’ve previoulsy seen low costs SX1278 LoRa modules @ 433 MHz  which you could connect to your own board, but Electrodragon is now selling Loraduino board with an Atmega328P MCU and SX1278 for just $6.10 / 5 Euros plus shipping, and using a layout similar to Arduino Pro Mini.

Loraduino specifications:

  • MCU – Microchip / Atmel Atmega328P MCU with Arduino pro mini bootloader
  • Storage – 16Mbit SPI flash for data
  • LoRa
    • Semtech SX1278 IC with 433mhz, or 470mhz central frequency
    • 10 km max range
    • 20dbm max power rate (configurable by software)
    • Tx current: 120 mA @ + 20 dBm; 90mA @ + 17dBm;  29mA @ + 13dBm
    • Data Rate –  1.2K to 300Kbps with FSK;  18 bps to 37.5Kbps with LoRa
  • Expansion
    • SX1278 Lora: leadout for pins IO1, IO2, IO3
    • Atmega: 14x digital input/output pins (including 6x PWM outputs), 6x analog inputs (TBC)
  • Misc – Programmable LED (D7),  power LED, and charge status LED.
  • Power Supply – On-board Lithium battery source jack, and MCP73831 smart charge IC. Charge when 5V power supplied to board.
  • Dimensions – 46×23 mm (Arduino Pro Mini: ~33x17mm)
  • Operating temperature –  -40 ℃ ~ +85 ℃

The board ships with a spring pin antenna, and a battery cable. The MCU and SX1278 chip are connected through an SPI interface. There’s limited information on the Wiki, where they explain you can use the board with Radiohead RF95 library, and load rf95_reliable_client.ino in Arduino IDE to test it out.

Thanks to Zoobab for the tip

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Helmut TschemernjakOSzoobabTCDurandA Recent comment authors
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Drone
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Drone

Instead of a usable schematic, when you click the teaser thumbnail on the Wiki you get this:

File:Loraduino sch.png->view
Access restrictions were established for this page. If you see this message, you have no access to this page.

As usual, another tempting product from China rendered useless by bad documentation.

Jkx
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Jkx

Too bad, no 868 Mhz option 🙁
If only they provide a way to choose between RF95 frequency option..

DurandA
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I believe that the 328P don’t have enough memory to support the LoRaWAN stack (since SX1278 is just a LoRa module).

TC
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TC

I’ll wait for chinese knockoffs.

zoobab
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@DurandA
any idea what are the requirements to run the lora stack?

Here they say it runs on the 328p:

https://github.com/things4u/LoRa-LMIC-1.51

“This library implements the LoRaWAN stack for a LoRa network. It contains the full LoRa stack and works on Teensy platform, ESP8266 and the Ardino Atmega328”

OS
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OS
Helmut Tschemernjak
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For an turnkey Arduino compatible LoRa board with great peer to peer support and 868 MHz secure and reliable messaging, check out this:
http://www.radioshuttle.de/en/longra-2/board/

zoobab
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