The Ebyte E291 series is a high-performance 410-510MHz Sub-1G wireless RF transceiver system based on the PAN3120 chipset, offering pure SPI hardware modules with up to 30dBm output power for 8km range alongside STM32F103C8T6-powered SC-type Type-C evaluation kits to streamline industrial IoT secondary development.
| Product Model | Product Type | RF Chipset | Frequency Range | TX Power | Max Distance | Dimensions / Interface | On-board MCU |
|---|---|---|---|---|---|---|---|
| E291-400MBH-SC(3120) | Test Kit / Evaluation Board | PAN3120 | Sub-1G (dependent on module) | Dependent on module | Dependent on module | 30 x 95.3 mm / Type-C | STM32F103C8T6 |
| E291-400MBL-SC(3120) | Test Kit / Evaluation Board | PAN3120 | Sub-1G (dependent on module) | Dependent on module | Dependent on module | 30 x 74 mm / Type-C | STM32F103C8T6 |
| E291-400M30S(3120) | Pure Hardware SPI Module | PAN3120 | 410 to 510 MHz | 30 dBm (1W) | 8 km | 38.5 x 24 mm / 4.9g | None (Requires External MCU) |
| E291-400MM20S(3120) | Pure Hardware SPI Module | PAN3120 | 410 to 510 MHz | 20 dBm (100mW) | 5 km | 10 x 10 mm / 0.5g | None (Requires External MCU) |
| E291-400M20S(3120) | Pure Hardware SPI Module | PAN3120 | 410 to 510 MHz | 20 dBm (100mW) | 5 km | 20 x 14 mm / 1.5g | None (Requires External MCU) |
Practical Application Scenarios
1. Long-Range Wireless Smart Metering Infrastructure
In remote residential utility monitoring, the E291-400M30S pure hardware module serves as a robust Sub-1G RF engine. Operating in the 410-510MHz spectrum with 30dBm (1W) transmit power, this SPI module penetrates thick concrete walls and urban obstacles, achieving a line-of-sight communication distance of up to 8km. This capability enables municipal systems to gather water, gas, and electricity consumption data autonomously without the high infrastructure overhead of cellular backhauls.
2. High-Density Agricultural Wireless Sensor Nodes
For precision farming over vast acreage, the ultra-miniature E291-400MM20S module, measuring just 10x10mm and weighing 0.5g, is optimized for integration into battery-powered leaf-temperature, soil moisture, and microclimate sensor probes. Utilizing the module's low-power profiles and 20dBm transmit power, embedded designers can deploy hundreds of sensor endpoints transmitting real-time telemetric parameters back to a central gateway over a 5km radius.
3. Rapid Prototype Verification and Modular Hardware Replacement
During the initial design phase for complex automation networks, hardware engineers can utilize the E291-400MBH-SC(3120) and E291-400MBL-SC(3120) evaluation kits. Equipped with an on-board STM32F103C8T6 MCU and dual-side headers, these kits allow developers to instantly patch GPIOs to actuators or host controllers. Because Ebyte’s new-generation Sub-1G modules feature pin-compatible physical packaging, engineering teams can switch and test different radio variants seamlessly on a single test kit without spinning new PCBs.
FAQ Section
1. What is the difference between the pure hardware modules and the SC evaluation kits?
The E291-400M30S, E291-400M20S, and E291-400MM20S are pure hardware SPI transceiver modules. They do not contain an on-board MCU and require an external host microcontroller to control them via the SPI register commands. In contrast, the E291-400MBH-SC and E291-400MBL-SC are complete evaluation kits that integrate an STM32F103C8T6 MCU, Type-C port, and pin breakouts, specifically designed to test and program these pure hardware modules.
2. How do I choose between the different physical dimensions of the E291 SPI modules?
The choice depends on your design constraints regarding space and transmission range. The E291-400M30S (38.5x24mm) provides the maximum 30dBm power for long-distance projects up to 8km. If space is highly restricted, the E291-400MM20S is a micro-footprint module measuring only 10x10mm with 20dBm power and a 5km range, while the E291-400M20S (20x14mm) offers a balanced layout-friendly SMD package with identical RF performance.
3. What resources are provided with the SC-series test kits to accelerate development?
Ebyte provides a complete software application code library and SDK matching the on-board STM32F103C8T6 MCU. All unused peripheral pins are fully exposed via double-row male pins on both sides of the evaluation board, enabling embedded software developers to easily connect logic analyzers, external sensors, and industrial actuators via jumper wires.
