The E28 series is a 2.4GHz RF transceiver module designed and manufactured by Chengdu Ebyte Electronic Technology Co., Ltd., with long communication distance; it has extremely low power consumption in low power mode. This series comes with a high performance PCB onboard antenna.
The E28 series uses Semtech's SX1280 RF chip, which contains a variety of physical layers and a variety of modulation methods, such as LORA, FLRC, GFSK. The special modulation and processing method
makes the transmission distance of LORA and FLRC modulation greatly increased; it is a high-performance IoT wireless transceiver and is compatible with the Bluetooth protocol. Excellent low-power performance, on-chip DC-DC and Time-of-flight make this chip powerful for smart homes, security systems, location tracking, wireless ranging, wearables, smart bracelets and health management, etc. . The SX1280 supports RSSI, allowing users to achieve deep secondary development as needed; the SX1280 also integrates time-of-flight for distance measurement.
Features: Adopted Semtech's SX1280 RF chip, the chip contains a variety of physical layers and a variety of modulation methods, LoRa, FLRC, GFSK. Special modulation and processing methods make the transmission distance of LoRa and FLRC modulation greatly increased; it is a high-performance IoT wireless transceiver and is compatible with the Bluetooth protocol.
Briefly introduce the TOF (time-of-flight) ranging method of time-of-flight ranging method:
The method is a two-way ranging technique that uses the time of flight of a data signal between a pair of transceivers to measure the distance between two points. The time interval between transmitting the data signal from the transmitting end and receiving the response signal from the receiving end is recorded as Tt, and the time interval at which the receiving end receives the data signal of the transmitting end and the response signal is recorded as Tr, as shown in the following figure. The one-way time of flight Tf = (Tt - Tr) / 2 between the pair of transceivers, the distance d = c * Tf between the two points, where c represents the electromagnetic wave propagation speed.
Figure 1 time-of-flight ranging method
Transmitting end: Data signal: Receiving end: Acknowledge signal
Then is the SX1280 ranging function details:
The ranging function of the SX1280 is based on measuring the round-trip flight time between a pair of SX1280 transceivers. This process USES the LoRa modulation scheme, enabling ranging to benefit from all the advantages of LoRa's long distance and low power operation. click here learn more
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