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TTN_LSN01_Data_Decoder_V001.js
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TTN_LSN01_Data_Decoder_V001.js
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// TTN Data Decoder for Dragino LSE01 (Custom Payload Format)
// Originally from Dragino,
// output format modified by Rolf Becker, 2020-01-03, V001
// A PAYLOAD FOR TESTING
// 0C D0 00 00 03 3F 07 14 18 9C 01
function Decoder(bytes, port) {
// Decode an uplink message from a buffer
// (array) of bytes to an object of fields.
var value=(bytes[0]<<8 | bytes[1]) & 0x3FFF;
var batV=value/1000;//Battery,units:V
value=bytes[2]<<8 | bytes[3];
if(bytes[2] & 0x80)
value |= 0xFFFF0000;
var temp_DS18B20=(value/10).toFixed(2);//DS18B20,temperature,units: °C
value=bytes[4]<<8 | bytes[5];
var water_SOIL=(value/100).toFixed(2);//water_SOIL,Humidity,units:%
value=bytes[6]<<8 | bytes[7];
var temp_SOIL;
if((value & 0x8000)>>15 === 0)
temp_SOIL=(value/100).toFixed(2);//temp_SOIL,temperature,units: °C
else if((value & 0x8000)>>15 === 1)
temp_SOIL=((value-0xFFFF)/100).toFixed(2);//temp_SOIL,temperature,units: °C
value=bytes[8]<<8 | bytes[9];
var conduct_SOIL=(value);//conduct_SOIL,conductivity,units: uS/cm
/*
// Original output format by Dragino
return {
bat:batV +" V",
temp_DS18B20:temp_DS18B20+" °C",
water_SOIL:water_SOIL+" %",
temp_SOIL:temp_SOIL+" °C",
conduct_SOIL:conduct_SOIL+" uS/cm"
};
*/
return {
battery_voltage: {
value: batV,
unit: "V",
comment: "LSE01 battery voltage"
},
extra_temperature_sensor: {
value: temp_DS18B20,
unit: "°C",
comment: "Temperature from an extra DS18B20. Not connected by default."
},
soil_sensor: {
moisture: {
value: water_SOIL,
unit: "%vol",
comment: "Volumetric soil water content"
},
temperature: {
value: temp_SOIL,
unit: "°C",
comment: "Soil temperature"
},
electrical_conductivity: {
value: conduct_SOIL,
unit: "uS/cm",
comment: "Soil electrical conductivity (EC)"
}
}
}
}