Lora-gateway设计介绍

LoRaEndNodeDesignSupportSemtechConfidentialSemtechSupportSemtechConfidentialSensornodedemoforAsia3470MHz868/915MHz434MHzSemtechConfidentialBlockDiagram4SemtechConfidentialLoramodule(LoraWAN)•SX1276LoRamodule--DesignbySMTC’spartner•HighperformanceSTM32MCU--powerfulenoughtosupportLoraMac•SmallSize:22mmx22mm•4LayersPCB,24pinsSMTpackage•TXOP=20dBm@434MHz/470MHz•TXOP=14dBm@868MHz/915MHz•32KHzexternalXTALforlowpowerconsumption•ReservedSPI,UART,I²C,USB,andothersGPIO5SemtechConfidentialBlockofCherrymodule6STM32L151C8U6SX1276SPISPIUARTSWIMI²CADCGPIO434/470MHzTXwith20dBm868/915MHzTXwith14dBm434/470MHzRX868/915MHzRXSemtechConfidentialCherryModuleSchematic7SemtechConfidentialSensorNodeSchematic8SemtechConfidentialLayout--toplayer9
4layersdesign
Toplayers--placementofcomponents--RFpartroutingSemtechConfidentialLayout–Midlayer110
Midlayer1--afulllayerofGND--agoodandcleanGNDlayeriscrucialforRFperformanceSemtechConfidentialLayout–Midlayer211
Midlayer2--routingforpowersupply--PowersupplyisseparatedfromRFroutingbyGNDlayer--keepacleandesignforpowersupplyisimportantSemtechConfidentialLayout–bottomlayer12
Bottomlayer--routingfordigitalpartSemtechConfidentialAntennadesign
twooptions•--PCBAntenna•--ExternalAntenna13SemtechConfidentialPCBAntenna--868MHzFrequencyETotal.dB(dB)Efficiency()868MHz-4.35989%14EIRPFrequencyConductiveOP(dBm)withenclosurewithoutenclosure868MHz14.5dBm7.26dBm9.31dBm•868MHz2Dand3Dpattern
PerformanceofPCBantenna@868MHzSemtechConfidentialSWfunctiondefinition•SupportLoraWANClassA(batteryoperated)•Reportbelowinformationfromsensorsperiodically(e.g.every5s)–Airpressure,altitudeandtemperature–GPSinformation–batterylevel–reserved:motiondetection()•Specified8channelat434/470/868/920MHZ•CouldreceiveACKandLEDON/OFFcommandfromserver•LowpowerconsumptiondesignwithonebuttonON/OFF15SemtechConfidentialUplink--packetonserverExample:16FunctionReservedFixedAirpressureTemperatureAltitudeBatteryLevelGPSlatitudeGPSlongitudeGpsAltitudebytenumbyte00byte01byte02byte03byte04byte05byte06byte07byte08byte09byte10byte11byte12byte13byte14byte15example0025db09ab0b78a942da7a04f42d01b0ValueReservedFixed2273.3hPa24.75℃2936m67%43.81306°3.24653°432mByte00—00:“FCT”LEDstatusByte0102—25db:0x25db=227332273.3hPaByte0304—09ab:0x09ab=247524.75℃Byte0506—0b78:0x0b78=29362936/10=293.6mByte07—a9:0xa9=169;169/254=67%Byte080910—42da7a:0x42da7a=438130643.81306°(East)Byte111213—04f42d:0x04f42d=3246533.24653°(North)Byte1415—01b0:0x01b0--432mSemtechConfidentialCommunicatewithConcentrator--Downlink•Downlink—ConcentratorsentACKtoturnON/OFF”FCT”LED17SemtechConfidentialEndnodeFWStructure
SWcodeavailableat::
Gateway•Bridgebetweenradioandserver•Performprotocolconversion•DoesNOTimplementLoraWANdirectly•Forwardpackettoandfromnode/serverSemtechConfidentialSX1301Overview•Multi-Modem/Multi-channel–10channels–9LoRamodems–1FSKmodem•Veryhighcapacity•Adaptivelinkrate–Optimizecapacity–Scalable•2MHzofspectrum–WideFEcanbeusedSemtechConfidentialSX1301ConcentratorBoard
Keyfeatures:SimpleandsinglebanddesignoneantennawithhalfduplexSemtechConfidentialBlockDiagramSemtechConfidentialConcentrator-demosystem–withPcduinoSemtechConfidentialSchematic--Powersupply27--Input:5VDC(externalorfromUSB)--VCCCDIG33:3.3VforSX1301andFTDI--VCCDIG18:1.8VforSX1301--VCCPA:3.3VforPA--VCCA_A(B):3.3Vforradio(SX1255/7)A(B)--VCCLNA:3.3VforLNASemtechConfidentialSchematic--FTDI28--bridgebetweenUSBandSPISemtechConfidentialSchematic--SX130129SemtechConfidentialSchematic--Radio30SemtechConfidentialLayout--toplayer31
4layersdesign
Toplayers--placementofcomponents--RFpartroutingSemtechConfidentialLayout–Midlayer132
Midlayer1--afulllayerofGND--agoodandcleanGNDlayeriscrucialforRFperformanceSemtechConfidentialLayout–Midlayer233
Midlayer2:routingforpowersupply(except5V)--PowersupplyisseparatedfromRFroutingbyGNDlayer--keepacleandesignforpowersupplyisimportantSemtechConfidentialLayout--bottomlayer34
Bottomlayer--routingfordigitalpartand5VDCSemtechConfidentialConcentratorSWoverview
ConcentratorSWavailableat••
DirectorySemtechConfidentialConcentratorSWoverview
Lora_gatewayoLibraryofdriver/HAL(basedonLinuxplatform)oComposeof5modules--loragw_hal--loragw_reg--loragw_spi--loragw_aux--loragw_gps
Packet_forwarder•AprogramthatforwardthepacketbetweennodeandserverviaUDP/IPlinkSemtechConfidentialConcentratorSWoverview
upstreamSemtechConfidentialConcentratorSWoverview
downstreamSemtechConfidentialConcentratorSWoverview
Configure“global_conf_jason”fileSemtechConfidentialConcentratorSWoverview
Configure“local_conf_jason”file•withhigherpriority,theparameterconfiguredinthisfilewillover-writethosein“global_co