ESP32-C6, Meet LoRa

Plenty of microcontrollers have built-in wireless connectivity these days. Options such as Wi-Fi and Bluetooth make it easy to integrate these chips into a wide range of smart home devices. But what if these devices need to communicate over long distances that are out of the range of Wi-Fi? Typically, you would need to design a custom circuit including additional hardware to accommodate this need. While certainly possible, this adds complexity, cost, and bulk to the design.

M5Stack is trying to simplify these builds with a new module called the M5Stamp C6LoRa. It comes equipped with a powerful ESP32-C6 microcontroller that handles processing, as well as Wi-Fi 6 and Bluetooth LE communication. For longer-range communications, the package also contains an SX1262 LoRa transceiver chip that can extend its communication range up to a few miles. The 18×15×2.3 mm C6LoRa sells for $12.95, making it affordable for a wide range of applications.

The ESP32-C6 system-on-chip from Espressif Systems features a 32-bit RISC-V processor running at up to 160 MHz, paired with a secondary low-power RISC-V core operating at up to 20 MHz. The architecture allows developers to balance performance with energy efficiency, which is particularly useful in battery-powered IoT deployments. The chip also supports Wi-Fi 6, Bluetooth 5.3, and 802.15.4 connectivity, enabling compatibility with networking standards such as Thread and Zigbee.

The module integrates 16 MB of external flash storage and exposes 16 GPIO pins from the ESP32-C6 for connecting sensors, actuators, or other peripherals. An onboard I²C I/O expander provides five additional extended I/O lines while also handling control of the LoRa subsystem. This design approach frees up the microcontroller’s native pins while allowing the module to manage radio control signals and amplifier functions internally.

For long-distance communication, the SX1262 LoRa transceiver operates across the 850 to 960 MHz frequency band. It supports a maximum transmit power of +22 dBm and a receive sensitivity as low as –148 dBm, enabling reliable communication over several miles in open environments. To further improve reception performance, the module includes an SGM13005L4 low-noise amplifier. Two onboard IPEX-4 connectors allow users to attach dedicated antennas for both the Wi-Fi and LoRa radios.

With its compact size, integrated long-range radio, and multiple wireless standards, the M5Stamp C6LoRa is well suited for applications such as smart agriculture, industrial monitoring, remote metering, and outdoor control systems where both local connectivity and long-distance communication are required.