E22-230T37S is a new generation of LoRa wireless module. It is a wireless serial port module (UART) based on LoRa solution. It has a variety of transmission methods, works in the 230MHz frequency band, TTL level output, and supports 4.5V-15V power supply voltage.
[Product weight]：10.8±0.1g
[Communication interface]：UART serial port
[Carrier frequency]：220.125～236.125MHz
[Transmission power]：37dBm
[Communication distance]：25km
Manual Download
E22-230T37S Manual
Company Profile
RF_Setting(E22-E9X(SL))+V3.3
Application Note
Application
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Smart Agriculture & Irrigation Control: Utilizing the 25km ultra-long-range capability to monitor soil moisture and control solenoid valves in large-scale farms where cellular coverage is unavailable.
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Industrial Oil & Gas Pipeline Monitoring: Leveraging the 37dBm high penetration power and the 230MHz lower frequency diffraction advantage to transmit pressure and flow data across rugged terrains and metal structures.
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Smart Grid & Power Line Monitoring: Employing the multi-level relay networking feature to extend signal coverage along high-voltage transmission lines, ensuring reliable data backhaul in high-interference environments.
FAQ
Q: Why is a level conversion circuit required when interfacing with a 5V MCU?
A: Although the module supports a wide supply voltage up to 15V, its UART communication interface operates at a 3.3V TTL logic level. Connecting a 5V MCU directly to the RXD pin can lead to excessive current injection through the internal ESD protection diodes, which poses a significant risk of permanent thermal damage to the SX1262 chip. Using a level shifter or a simple resistor-based voltage divider is essential to ensure signal integrity and hardware longevity.
Q: What are the power supply requirements to maintain a stable 37dBm output?
A: To reach the peak 5W transmission power, the power supply must be capable of providing at least 3.5A of instantaneous current at 5V. If the supply impedance is too high or the traces are too thin, the transient voltage drop during transmission will cause frequency pulling or power output degradation. It is recommended to place a high-quality 470uF or larger electrolytic capacitor near the VCC pin to buffer current spikes.
Q: How does the 230MHz frequency band compare to 433MHz in terms of diffraction?
A: The 230MHz band has a longer wavelength than the 433MHz band, which inherently provides better diffraction characteristics when encountering physical obstacles like buildings or hills. This allows the E22-230T37S to "bend" around obstacles more effectively, significantly reducing shadow fading and improving link reliability in non-line-of-sight industrial environments.
