Link Search Menu Expand Document
lora-devices-ttn

Dragino - LDS02

The LDS02 is a LoRaWAN Window/Door sensor.

Table of contents

  1. Specifications
  2. Documents
  3. Ordering Info
  4. Adding the Device to TTN
  5. Payload formatter

Specifications

  • indoor device
  • Price ca. CHF 22.- (03.08.2023)
  • Built-in sensors
    • Magnetic reed switch, [open/close]
  • Power Supply: 2 common AAA batteries, 1.5 V
    • Expected life time: depending on usage, 16’000 ~ 70’000 state changes
  • LoRaWAN version: 1.0.3
  • LoRaWAN device class: A
  • Size: 69.2 × 29.2 × 15 mm
  • Weight: 55 g

Documents

Ordering Info

  • Part Number: LDS02-XX
    • XX is frequency band, for ttn in Europe choose EU868
  • Ordering Link

Adding the Device to TTN

  • Before a device can communicate via “The Things Network” we have to add it to an application.
  1. Create a new application
  2. Under Overview click (+) Register device
  3. Under Input method select Select the end device in the LoRaWAN Device Repository
  4. Enter the following device information
    • End device brand select Dragino Technology Co., Limited
    • Model select LDS02
    • Hardware Ver. select Unknown Ver. or whatever is possible or on the sticker
    • Firmware select 1.5 or whatever is possible or on the sticker
      • Profile (Region) select EU_863_870
  5. Under Frequency plan select Europe 863-870 Mhz (SF9 for RX2 - recommended)
  6. Under JoinEUI enter the App EUI from the sticker
  7. Enter as well the DevEUI and the AppKey from the sticker
  8. Set an end-device name
  9. Press Register end device
  10. Open the case and take out the batteries
  11. Replace the batteries and close the case
  • Now the device should join the network and you can see the incoming telegrams in the Live data section
  • The payload formatter should already be preset. If not, you can copy/paste it from below

Payload formatter

function decodeUplink(input) {
  var port = input.fPort;
  var bytes = input.bytes;
  var value=(bytes[0]<<8 | bytes[1])&0x3FFF;
  var bat=value/1000;//Battery,units:V
  
  var door_open_status=bytes[0]&0x80?1:0;//1:open,0:close
  var water_leak_status=bytes[0]&0x40?1:0;
  
  var mod=bytes[2];
  var alarm=bytes[9]&0x01;
  var data = {};
  	 switch (input.fPort) {
		 case 10:
  if(mod==1){
    var open_times=bytes[3]<<16 | bytes[4]<<8 | bytes[5];
    var open_duration=bytes[6]<<16 | bytes[7]<<8 | bytes[8];//units:min
    
      data.BAT_V=bat,
      data.MOD=mod,
      data.DOOR_OPEN_STATUS=door_open_status,
      data.DOOR_OPEN_TIMES=open_times,
      data.LAST_DOOR_OPEN_DURATION=open_duration,
     data.ALARM=alarm
    
  
}
  else if(mod==2)
  {
  var leak_times=bytes[3]<<16 | bytes[4]<<8 | bytes[5];
  var leak_duration=bytes[6]<<16 | bytes[7]<<8 | bytes[8];//units:min
  
      data.BAT_V=bat,
      data.MOD=mod,
      data.WATER_LEAK_STATUS=water_leak_status,
      data.WATER_LEAK_TIMES=leak_times,
      data.LAST_WATER_LEAK_DURATION=leak_duration
  
}
  else if(mod==3)
  
  {
      data.BAT_V=bat,
      data.MOD=mod,
      data.DOOR_OPEN_STATUS=door_open_status,
      data.WATER_LEAK_STATUS=water_leak_status,
      data.ALARM=alarm

  }

  else{
      data.BAT_V=bat,
      data.MOD=mod
  }
  return {
      data: data,
    }
	default:
    return {
      errors: ["unknown FPort"]
    }
}
}