HKW38 wireless module is the use made of Silicon Laboratories' Si4438 devices, SI4438 is a highly integrated wireless ISM band transceiver chip. He has very high receiver sensitivity (-124 dBm), together with the industry-leading +20 dBm of output power .. Effective communication distance 800-1000 m, at a low rate as far as 1800 meters. Lead-free design, the product is easy to detect through RHOS; harmonic small, easily detected by electromagnetic interference. Small size. The module has a high cost, it is the ideal choice for 100 m to 1000 m between the actually applied. Module performance 1: FSK / GFKS technology, receive and transmit half-duplex communication, super anti-jamming 2:. ISM multiband, frequency does not need to apply for free use of 3: choose a wide frequency range, multiple transmission rates. can be used in FDMA and FM technologies 4: intelligent reset, low voltage monitoring 5: Timing wake, low-power mode 6: ISSI channel detection function 7: good stability, small size, easy to install 8: without production debugging, easy to mass production, to ensure product consistency 9: Transfer Mode: FIFO / direct mode (recommended FIFO packet mode) 10: Configuration: AFC / Air wake-up feature / low power / Carrier Sense 11: Fast send / receive / standby and other state switch, can improve the efficiency of the entire system characteristic frequency range: 425-525 sensitivity up to -124dBm l Maximum output power: 20dBm 85 mA @ + 20dBm (transmit) l Data transfer rate: 0.1 -500kbps FSK, GFSK and OOK modulation mode l 1.8-3.6 V power supply ultra-low consumption shutdown mode l digital received signal strength indication (RSSI) timed wake-up function and two-way matching l automatic antenna switch control Configurable packet structure before l synchronization signal detector 64 byte transmit and receive data register (FIFO ) l Low power detection temperature sensing and 8 ADC l Operating temperature range: -20 ~ + 60 ° C Integrated Voltage Regulator hopping function on reset function l l-chip crystal adjustment application market 1: remote control and Remote Data Acquisition System 2: Wireless meter (water, electricity, gas) 3: Wireless la carte 4: industrial data acquisition, transmission, intelligent control system 5: Wireless Alarm System 6: 7 intelligent furniture system: Baby monitoring system / hospital paging system 8: oilfield, mining, construction sites, factories and other original 485/232 Interface System 9: Wireless small data transmission system