We will soon be releasing two new versions of this module, one with an U.FL connector, and one with an integrated(onboard) antenna.
The inAir4 is a 433Mhz wireless module using the Semtech SX1278(or SX1276) chip, with a standard SMA connector (for antenna). The frequency is configured in software, and will typically be used for the 430 to 435MHz ISM band(contry dependant). It is part of our iMod product range. The SX1278 is a revolutionary new chip enabling wireless communications at distances up to 15km, using Semtech's LoRa(Long Range) technology. This chip also supports high performance (G)FSK modes for systems including WMBus, IEEE802.15.4g.
This module can be assembled with the SX1276 or SX1278 chip. Both chips are identical when used for 433MHz operation. This module is based on the Semtech SX1276RF1JAS reference designs.
The board is a high quality, RF optimized, 4 layer PCB. It has been designed with assistance from Semtech engineers, ensuring optimum layout and performance! Only brand name, high quality components are used! All capacitors and inductors are high precision parts, resulting in optimized performance. The crystal a very critical component for the SX1278, and is required to be very accurate to achieve high sensitivity. This board uses a high accuracy crystal as recommended by Semtech.
This module will outperform competitor products that use 2 layer PCBs, cheap capacitors and inductors and low accuracy crystals! When choosing a SX1278 module, it is very important to realize that they will NOT all perform the same just because they use the same chip! Designing RF boards is very tricky, and lots of power and sensitivity is lost due to bad PCB design and poor components!
This module enables 3.3V devices (like a Microcontroller for example) to communicate with remote nodes via a wireless protocol. For details on the SX1278 chip, download it's datasheet from www.semtech.com.
A SMA Edge connector (CON-SMA-FE16-RG) is mounted on this board. It can however also be assembled with a U.FL connector. Two standard 1x7, 2.54mm (0.1") pin header (or press-fit headers) can be soldered onto this board (position X1 and X2 on board). If required, wires can of course be soldered onto the PCB in stead of pin headers. If required, this module can also be used as a SX1276 breakout board, and wires can be soldered onto the PCB in stead of pin headers.
Top view (without SMA connector)
Schematics (pdf format)
|Click to enlarge|
Note that solder jumper J1 at the back of the board has to be made to apply power to the RF Switch. Making jumper J1 applies permanent 3.3V power to the RF Switch (U5 in schematic = PE4259).
If solder jumper J1 is not made, power for the RF switch is supplied via iMod port pin 10, marked VS on PCB. This is useful for very low power applications that want to save the 9 to 20uA supply current required by the RF switch. For these applications, power can be supplied(to iMod port pin 10) via a port pin on CPU only when transmitting or receiving.
|inAir4 Datasheet and Schematics|
The inAir4 module can be used with virtually any Microcontroller that has a SPI port, some free I/Os, and operates at 1.8-3.3V.
For links to example code for Arduino, mbed and Raspberry Pi, click here.
Our NZ32 STM32 Microcontroller boards can be used together with the inAir9 module. The NZ32-SC151 boards is assembled with the STM32L151RC microcontroller (compatible with other STM32L151 and STM32L152 chips). It has a Lithium Polymer battery charger, 3.3V DC/DC regulator, high speed and RTC crystal, LEDs, buttons and circuitry for doing various analog measurements. This board will be followed by alternative versions assembled with the STM32F030R8T6 (low cost), STM32F205RCT6 and STM32F411RCT6 microcontrollers.
A SX1274 API, and various example projects are available on the mbed.org developer site (search site for SX1276 or SX1278). We will also soon be providing an example project for our STM32 board mentioned above.
This board can be used together with the STM32 board mentioned above to implement the LoRa WAN protocol. The code is available for free from IBM, just do an internet search for "LoRa WAN in C". At the time of writing this, it was available here.
There is also additional code available on GitHub, to see it click here.
Semtech recently announced that Microchip Technology Inc. adopted Semtech’s long-range LoRa™ RF technology. We still have to perform tests, but it is possible that these modules will be compatible with Microchip's example code. Special versions of this board using Microchip LoRa chips can also be assembled on request (once these chips become available).
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