Description

• Arduino Pro Mini (3.3V @ 8MHz) compatible LoRaWAN development board using RFM95 (868/915 MHz) module.
• Programming is exactly like Arduino Pro Mini (3.3v @ 8MHz) with same pin mapping.
• Bootloader is same as Arduino Pro Mini (3.3v @ 8MHz).
• Low power board without redundant components.
• SMA and U.FL compatible antenna connector.
• On board reset button and an LED for debugging.
• Breadboard compatible.

Shipping Note (Your Order)

• Fully Assembled LoRaWAN-miniBrick board without RFM95 module.
• 6 pin 90 degree male burg strip for FTDI-Adapter interface (based on stock).

Original Components

• Both ATmega328PB (MCU) and MCP1703A (voltage regulator) are purchased from Mouser Electronics
• 8 MHz Ceramic Resonator from Murata Electronics having a tolerance of 0.1%

Power Consumption

• In its lowest power saving mode the board consumes around 2uA @ 3.3V, this is achieved when ATmega328PB is in Power-Down mode (wake-up from external interrupt) and RFM95 is in Sleep mode.

How to program?

• In Arduino IDE select Board : "Arduino Pro or Pro Mini" and Processor : "ATmega328 (3.3V,8MHz)".
• Use FTDI adapter to upload code.

How to enable LoRaWAN in Arduino code?

• To enable LoRaWAN close three jumpers marked as D1, D2 and RST on the board.
• A very famous LoRaWAN Arduino library is available to use : arduino-lmic
• In the example codes of the library, change the pin mapping as shown below : const lmic_pinmap lmic_pins = { .nss = 10, .rxtx = LMIC_UNUSED_PIN, .rst = 9, .dio = {2, 7, 8},};

MCU and RFM95 Pin Mapping

MCU and LED Pin Mapping

• An on board LED is available via jumper (JL) that can also be used for debugging application code.
• The LED is connected to Arduino pin number 6

Input Voltage Requirements

• Input voltage VIN range 3.3v to 12v, but because of high dropout voltage at higher output current I would advise to use VIN range 4v to 12v
• VIN is converted to 3.3v using an on board regulator (MCP1703A) with maximum output current of 250 mA.
• Both MCU and RFM95 are powered from this regulated 3.3v
• The regulated 3.3V is available on one of the pins of the board (see images) and can be used to power external circuit.

Questions?

• I am available to answer any kind of doubt regarding my product before and after purchase. Please feel free to ask.

Why did you make it?

• Unavailability of inexpensive low power MCU boards with on board space for LoRa module.

What makes it special?

• Low Power.
• Low Cost.
• Easy to use Arduino compatible LoRaWAN/LoRa board.
• Original components purchased from authorized distributor - Mouser Electronics