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The Ra-01 LoRa module, made by Ai-Thinker, uses spread-spectrum communication for long-range links with larger bandwidth and better interference resistance than ordinary narrowband radios. It is built around the SX1278 chip and operates around 433 MHz, with a tunable frequency range of 420 to 450 MHz, in a compact 17 x 16 mm package.
It communicates over half-duplex SPI and GPIO, and it supports several modulation schemes: FSK, GFSK, MSK, GMSK, LoRa and OOK, with a programmable bit rate up to 300 kbps.
Output power reaches +20 dBm (10 mW). Operating voltage is 1.8 to 3.7 V, with a default of 3.3 V. Receive current is under 10.8 mA, transmit current is under 120 mA at +20 dBm and sleep mode draws only 0.2 microamps. RSSI range is 127 dB, there is automatic RF signal detection with CAD mode and a CRC engine for up to 256 bytes of data. Pin pitch is 2.0 mm, the module is a half-hole castellated SMD package with a metal shielding case, and it works from -40 to +85 C.
Power the module from a clean, adequately rated supply, since radio modules draw current in short bursts that a weak supply cannot follow. Keep the antenna clear of metal and ground planes, and start with the maker's example code before writing your own.
Makers building long-range sensor links, remote controls and telemetry systems who want a proven, low-cost LoRa module they can solder onto their own board.
The SX1278.
Around 433 MHz, tunable from 420 to 450 MHz.
Over half-duplex SPI, plus GPIO.
+20 dBm (10 mW).
1.8 to 3.7 V, 3.3 V by default.
| Brand | Generic |
|---|---|
| Chipset | SX1278 |
| Frequency | 433MHz |
| Selling unit | PCS |
